最新刊期
卷 ， 期 12 ， 2014
- 摘要：A new method for assisting protein folding by using thermosensitive mixed-shell polymeric micelles (MSPMs) as artificial chaperone was introduced.Three kinds of novel thermosensitive MSPMs with different ratios of PLA-b-PEG and PLA-b-PNIPAM were prepared.The stability of MSPMs at different concentrations of guanidine hydrochloride (GuHCl) and urea or at 37 ℃ was characterizaed by dynamic light scattering (DLS).Carbonic anhydrase B (CAB) and lipase were chosen as model proteins to illustrate the effect of protein refolding assisted by thermosensitive MSPMs.The results showed that the thermosensitive property of PNIPAM was maintained and the stability of MSPM with PLA-b-PNIPAM/PLA-b-PEG ratio of 1:1 was very good even under conditions of high concentration of denaturant or 37 ℃.Furthermore,all the three kinds of MSPMs with ratio of 2:1,1:2 and 1:1 can promote the refolding of denatured CAB and lipase,which are much higher than the yields of spontaneous refolding.The MSPM with molar ratio of 1:1 can enhance the refolding yield of CAB to reach as high as 92.1% and that of lipase to reach 50%.关键词：Thermosensitive polymer;Mixed-shell polymeric micelles;Protein folding;Artificial chaperone;Hydrophobic interaction
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发布时间：2021-03-19 - 摘要：Polystyrene@silica hybrid microspheres (PS@SiO2) and hollow spheres of SiO2(HSSi) were prepared using positively charged polystyrene (PS) microspheres as the template.Then,gold nanoparticles (Au-NPs) and silver nanoparticles (Ag-NPs) were modified onto the surface of PS@SiO2and HSSi,respectively,through the bridging coupling by mercapto silane coupling agents,which leads to the following four kinds of composite microspheres with uniform structures and narrow size distributions:(1) HSSi with the surface being modified with Au-NPs (HSSi-AuNPs); (2) PS@SiO2 with the surface being modified with AuNPs (PS@SiO2-AuNPs); (3) HSSi with the surface being modified with Ag-NPs (HSSi-AgNPs) and (4) PS@SiO2 with the surface being modified with AgNPs (PS@SiO2-AgNPs).These composite microspheres were used as SERS substrates,whose sensitivity,reproducibility and stability were evaluated by using crystal violet (CV) as the probe.The detection limits of CV by HSSi-AuNPs,PS@SiO2-AuNPs,HSSi-AgNPs and PS@SiO2-AgNPs are 10-10 mol/L,10-9 mol/L,10-11 mol/L and 10-11 mol/L,respectively.All these substrates exhibit relatively high sensitivities; the hollow structures make positive contributions to the sensitivities.Results of repeated Raman measurements of CV on the different spots randomly selected from the substrates confirm that all the substrates have good reproducibility.Moreover,all the substrates have a good stability,because they still have good sensitivities after having been stored in ambient environment for 3 months.关键词：Surface enhanced raman scattering (SERS);Gold nanoparticles;Silver nanoparticles;Silica microspheres;Crystal violet
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发布时间：2021-03-19 - 摘要：Two low density polyethylene resins (sample A and sample B) were fractionated through temperature rising elution fractionation (TREF),and GPC,13C-NMR,DSC and SSA are exploited to study the chain structure of original resins and their fractions.The two resins with unimodal distribution have different properties.Compared with sample B,sample A possesses higher tensile break strength and film puncture resistance.By13C-NMR,the total branch contents of samples A and B are 3.93 mol% and 4.82 mol%,respectively.Both resins have short chain branch and long chain branch structures.It is also found that the branching content of the fractions decreases with the elution temperature,which is in accordance with TREF mechanism.By the TREF-GPC cross-fractionation results,the fractions of two resins focus on higher temperature region.The dominant fraction of sample A is eluted at 80 ℃,and its molecular weight is concentrated at 32104.The dominant fraction of sample B is eluted at 75 ℃,and its molecular weight is concentrated at 18104.Sample A has a slightly higher molecular weight,more content on high molecular weight,broader molecular weight distribution.In DSC results,the melting temperatures of samples A and B are 110.5 ℃ and 110.2 ℃,respectively.Both samples have broader melting range corresponding to 50~120 ℃.In the SSA thermal fractionation,each fraction of the two samples shows a broad range endotherm with multiple melting peaks (more than eight peaks).The arithmetic mean methylene sequence length of fractions for the two samples gradually increases from 34 to 86 and from 32 to 84 with the increase in the elution temperature,respectively.In addition,the characteristics of chain microstructure and the relationship of structure and properties were discussed.关键词：Low density polyethylene;Temperature rising elution fractionation;Chain structure
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发布时间：2021-03-19 - 摘要：Rheology and conductivity techniques were used to systematically investigate the aggregation behaviors of sodium lignosulfonates (SL) in the concentrated solutions, and the influences of inorganic salts (NaCl, Na2SO4), ureas and straight-chain alcohols (methanol, ethanol, n-propanol) on the aggregation behaviors of the concentrated SL solutions were also explored. The experimental results indicated that the addition of inorganic salts was in favor of the electrostatic repulsion shielding effect and the solvent polarity enhancement, which promoted the formation of larger SL aggregates, however, the result was just opposite after the addition of ureas due to the destruction of hydrogen bondings and the weakening of aggregation interactions. In the meantime, when a small amount of straight-chain alcohols were added in the SL solutions, their non-polar carbon chains could insert into the hydrophobic cores of SL aggregates, which resulted in the decrease of the aggregation degree. However, the excessive addition of straight-chain alcohols was favorable to the formation of aggregates. This may be attributable to the increase of the hydrophobic interaction and the aggregation degree, which was caused by the raised pH. Based on electrostatic repulsions, hydrogen bondings and hydrophobic interactions, the aggregation behaviors of SL in the concentrated solutions were explained reasonably.关键词：Sodium lignosulfonate;Concentrated solutions;Aggregation behaviors;Rheological behaviors;Mechanism
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发布时间：2021-03-19 - 摘要：Tiny amounts of 1,5-hexadiene (1,5-HD) are introduced into propylene bulk polymerization using Ziegler-Natta catalyst.The thermal stability can be enhanced by possible backbone cyclization which has inconspicuous change to the backbone structures of polypropylene.MgCl2/TiCl4 catalyst with 9,9-bis-(methoxymethyl) fluorine (BMMF) as internal electron donor is used for bulk polymerization and concentrations of 1,5-HD are controlled well below 0.1 mol/L.Nuclear magnetic resonance (NMR),gel permeation chromatography(GPC),differential scanning calorimetry (DSC),dynamic shear rheology and scanning electron microscopy (SEM) are used to characterize the structures and morphology of the polymer.The results indicate that,albeit the catalytic activity and polymer molecular weight exhibit certain degrees of decrease due to 1,5-HD,the major crystallization properties of polypropylene including melting temperature (Tm),fusion enthalpy during melting (Hf) and maximum crystallization temperature (Tc) remain almost unchanged.Because of the tiny amounts of 1,5-HD,the structure of 1,5-HD in PP cannot be detected by neither1H-NMR nor13C-NMR.The isotacticity of PP has little change by13C-NMR.The structure of polymer is linear which is characterized by GPC and dynamic shear rheology analysis and no branched or crosslinking structure is formed in polymerization.The insertion of 1,5-HD has little influence to the chain structure of polypropylene macromolecules.Thermogravimetric analysis (TGA) results indicate that the thermal stability of polypropylene is much improved by polymerizing with 1,5-HD.The onset degradation temperatures (Tonset) of polypropylenes obtained with the presence of 1,5-HD are increased by as much as 20 K,from 460.6 ℃ to 482.3 ℃ under nitrogen atmosphere and 5% and 10% weight loss temperature increased about 30 degree.It indicates that tiny amounts of 1,5-HD is indeed inserted into the macromolecule chain as the cyclic structure which enhances the rigidity and improves the thermal stability of the polymer.Moreover,polymer particles in reactor are granule-like,which meets the demand of industrial polymerization process.Overall,this research provides new thinking to improving thermal stability of polypropylene resins.关键词：Propylene polymerization;Ziegler-Natta catalyst;Polypropylene;1,5-Hexadiene;Thermal stability
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发布时间：2021-03-19 - 摘要：The effects of the inorganic particle size and the surface chemicals on the photo-oxidation of PP/CaCO3 composites are investigated,especially from the aspect of interface.Firstly,it is at the interface that the effect of filler particles on the photo-oxidation of PP matrix takes place.The interfacial area and chemicals of CaCO3particles are proved to be key factors that change the photo-oxidation rate of PP.A larger interfacial area leads to a faster photo-oxidation,so the PP/nano-CaCO3composite (PP/nmCaCO3) photo-degraded faster than the PP/micro-CaCO3composite (PP/mCaCO3) with the same load of CaCO3.Surface treatment with different coupling agents changes the surface chemicals of CaCO3 and thus the photo-oxidation rate.Based on this,a model of the photo-oxidation of polymer composites was developed,and the reaction rate formula was put forward for the first time.Secondly,an interfacial enlargement experiment,which is also the first trial in this field,was carried out.This experiment confirmed that the surface chemicals on CaCO3 particles largely accelerated the aging of PP during photo-oxidation.Meanwhile,titanate treated CaCO3 could accelerate the photo-oxidation of PP greatly,and a synergistic effect between titanate and CaCO3 was observed.关键词：PP;CaCO3;Interface;Photo-oxidation
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发布时间：2021-03-19 - 摘要：Polymeric microspheres ware prepared by the breath figures (BFs) method which had the inexpensive and simple process.A variety of polymeric microspheres,such as acrylate-styrene-acrylonitrile copolymer (ASA),poly(butylene succinate) (PBS),acrylonitrile butadiene styrene copolymer (ABS) and so on,were successfully prepared by BFs in the different nonsolvent atmospheres.Ethanol,methanol,n-hexane and acetic acid vapors were chosen as the nonsolvent atmosphere.Several influencing factors were considered on the formation of the microspheres with different morphologies,including the concentration of the polymer solution,the surface tension of ASA/CHCl3 solutions and the nonsolvent atmosphere.Then the patterns were characterized by scanning electron microscopy (SEM).It was found that the nonsolvent atmosphere affected the microspheres morphology,including the microspheres shape,size and the diameter distribution.With the decrease of the concentration of ethanol in water,the morphology of the microspheres became that of micropores.Furthermore,with the increase of the concentration of the polymer solution,a gradual change was observed in the polymeric morphology,from a microsphere pattern to a porous structure composed of adjoined microsphere in the ethanol atmosphere.The results proved that the BFs method is not only suitable for preparing ordered porous polymer films,but is also compatible with preparing polymeric microspheres.Also,this paper develops a facile way to control the morphology features by changing the vapor atmosphere,which is valuable for designing and fabricating ordered polymeric microstructures.关键词：Breath figures;Nonsolvent;Polymer;Microsphere;Porous films
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发布时间：2021-03-19 - 摘要：Thieno[2,3-b]thiophene-diketopyrrolopyrrole (DPPTTZ),a novel cross-conjugated electron-deficient unit,has been synthesized.This unit was brominated and then copolymerized with 2,5-bis(trimethylstannyl)thiophene,2,5-bis(trimethylstannyl)selenophene and 2,5-bis(trimethyl-stannyl)-N-methylpyrrole respectively,via Stille polymerzation,to form three donor-acceptor (D-A) type copolymers,poly{2,5-bis(2-octyldodecyl)-3-[5-(thiophen-2,5-yl)thieno[2,3-b]thiophen-2-yl]- 6-(thieno[2,3-b]thiophen-2,5-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione} (pDPPTTZ-T),poly{2,5-bis(2-octyldodecyl)-3-[5-(selenophen-2,5-yl)thieno[2,3-b]thiophen-2-yl]-6-(thieno[2,3-b]thiophen-2,5-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione} (pDPPTTZ-Se) and poly{2,5-bis(2-octyldodecyl)-3-[5-(N-methylpyrrole-2,5-yl)thieno[2,3-b]thiophen-2-yl]-6-(thieno[2,3-b]thiophen-2,5-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione} (pDPPTTZ-Py).These polymers exhibit deep HOMO energy levels (-5.26~-5.37 eV),leading to high open-circuit voltage (0.68~0.81 V) in OPV devices,and good stability of the devices towards atmospheric oxygen.The UV-Vis spectra show broad features with long-wavelength absorption maximum around 620 nm and optical band gap of 1.86 ,1.83 and 1.85 eV for pDPPTTZ-T,pDPPTTZ-Se and pDPPTTZ-Py respectively,which give polymers a good overlap of solar spectrum.Bulk heterojunction solar cells were fabricated by blending these polymers with [6,6]-phenyl-C71-butiric acid methyl ester (PC71MB),and the power conversion efficiency (PCE) reaches 3.05% for the as cast pDPPTTZ-T:PCBM-based device without optimization,under simulated AM 1.5 G irradiation of 100 mW/cm2.关键词：Cross-conjugated polymer;Pyrrolo[3,4-c]pyrrole;Thieno[2,3-b]thiophene;Organic solar cell;Polymer semiconductor
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发布时间：2021-03-19 - 摘要：Hydrothermal aging behavior of poly(butylene fumarate)(PBF) has been systematically studied in this article in order to evaluate the feasibility of PBF to be used as a biodegradable material.The variation of mechanical properties,thermal properties,molecular weight and chemical groups with the progress of aging has been investigated in detail by GPC,mechanical tests,DSC and ATR-FTIR.The results show that PBF possesses good aging resistance under natural condition.The mechanical properties vary little upon aging at 30 ℃ for 40 days.But the aging resistance of PBF decreases sharply with increasing temperature and the temperature greatly influences the aging behavior.With increasing the temperature to 60 ℃,the sample ages faster,and Mn decreases by about 50% upon degradation for 20 days.Further increasing temperature to 80 ℃,the sample ages very quickly,and Mn decreases to about 13% upon degradation for 5 days.No obvious change in content of C=C double bonds and carboxyl index has been observed.The presence of C=C double bonds is not the main cause of the aging of PBF and the aging mechanism is the plasticization and swelling of water,hydrolyzation of ester bonds,breakdown of polymer chains,and decrease of molecular weight.Obvious increase in crystallization temperature (3~18 K),melting temperature (2~4 K),and enthalpy (21%~55%) of PBF upon aging can be found,arising from the chemical crystallization.关键词：Poly(butylene fumarate);Biodegradable;Hydrothermal aging;Mechanical properties;Thermal properties
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发布时间：2021-03-19 - 摘要：A series of water-soluble carboxylated polyfluorenes containing iridium complex as the energy acceptor was synthesized via Suzuki coupling reaction.These anionic polymers (P4, P5 and P6) have 0,2 and 5 molar percentage of iridium (Ⅲ) complex units in the polymer backbone,respectively.The polymer (P6) with 5 mol% iridium (Ⅲ) complex shows efficient intrinsic fluorescence resonance energy transfer (FRET) in aqueous solution.The photoluminescence (PL) spectra studies show that the polymers (P4 and P6) have higher fluorescence intensity at high pH and quenched in water at low pH.As pH decreases the carboxylate groups become more protonation,which leads to more aggregation of the polymer chains.The polymer (P6) fluorescence changes were studied with lysozyme,hemoglobin,histone and heparin in PBS buffer solutions.Addition of lysozyme to the P6 solution led to quenching of the fluorene segment and gradual increase in the iridium (Ⅲ) complex emission band.Addition of hemoglobin to the polymer solution led to weak quenching due to the metalloprotein but neutral charged.Addition of histone and heparin to the P6 solution induced increase in emission for fluorene segments,which was due to the hydrophobic nature and the repulsion interaction between negatively charged heparin and P6 ,respectively.关键词：Iridium (Ⅲ) complex;Anionic Polyfluorene;FRET;Protein
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发布时间：2021-03-19 - 摘要：Surface molecularly imprinted polymers (SMIPs) with a core-shell structure were prepared through a novel two-step distillation precipitation polymerization (DPP) method.The first-step DPP allowed formation of cores composed of copolymeric microsphere of methacrylic acid and divinylbenzene (PMAA-co-DVB),and in the second-step DPP,the core was modified with a molecularly imprinting layer with erythromycin (EM) as template,methacrylic acid (MAA) as functional monomer,divinylbenzene (DVB) as crosslinking agent and azobisisobutyronitrile (AIBN) as initiator.Laser particle size determination,scanning electron microscope (SEM) and a series of binding tests were employed to characterize the morphology and the binding properties of the obtained SMIPs.It showed that when the fraction of the monomers was 7 vol% in the whole reaction system,the prepared PMAA-co-DVB microspheres afforded good morphology and monodispersity.Moreover,when the molar ratio of MAA to EM was 1:4 and the fraction of the monomers was 2.8 vol% in the second-step DPP,the synthesized SMIPs displayed optimal binding performance with the maximum binding capacity of 76.8 mg/g and the binding saturation time of 90 min.Meanwhile,the produced SMIPs exhibited higher binding ability to the template molecule-EM,compared with its analogue,roxithromycin.关键词：Two-step distillation precipitation polymerization;Surface molecularly imprinting;Erythromycin
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发布时间：2021-03-19 - 摘要：The nylon-6 yarns with different draw ratios were prepared,and the effect of drawing on the structural,morphological and textural features of these obtained yarns,such as the crystalline forms,the melting behavior and mechanical properties,were investigated by wide-angle X-ray diffraction (WAXD),Fourier transform infrared spectroscopy (FTIR),differential scanning calorimetry (DSC),sound velocimeter,scanning electron microscope (SEM) and multifunction yarn strength tester.The results demonstrated that with the increase of draw ratios,the crystallinity of nylon-6 yarns raised continuously along with the growth of -form and -form crystals,which were induced by segmental rearrangement of the amorphous area.The characteristic diffraction peaks of -form crystal appeared in the sample under the draw ratio of 3 times.These behaviors occurred in crystalline form also led to the enhancement of the melting temperature and the formation of the multiple melting peaks.Moreover,the axial orientation degree of molecular chains increased with increasing draw ratios,which facilitated to eliminate the residual stress and improve the defects on the surface of fibers.With the combination of all above factors,the mechanical properties of nylon-6 multifilament were enhanced to some degree.Particularly,the tensile strength and tensile modulus of the sample drawn by 3 times reached to 5.0 cN/dtex and 28.9 cN/dtex,respectively,which were the highest values among all samples.关键词：Nylon-6;Drawing;Crystalline forms;Mechanical properties
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发布时间：2021-03-19 - 摘要：Fluorinated triblock terpolymers PIB-b-PDMAEMA-b-POFPMA was synthesized by oxyanion-initiated polymerization and characterized by 1H-NMR and GPC.The physicochemical and film properties were studied in detail.Firstly,the thermal decomposition behavior and glass transition temperature (Tg) were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC),respectively.These results showed that PIB60-b-PDMAEMA63 have one transition temperature at -4 ℃ due to the compatibility of PIB and PDMAEMA segments,and the triblock terpolymer PIB60-b-PDMAEMA63-b-POFPMA11 have an additional Tg at 26 ℃ which corresponded to the glass transition temperature of POFPMA.Subsequently,the polymeric thin films were prepared by casting polymer/THF solutions on glass slides or PTFE panel substrates.It was found that the triblock terpolymers have a certain hydrophobic and oleophobic properties by contact angle test.The surface free energy,dispersion and polar components were calculated according to Owens-Wendt formulas.The results of AFM,SEM and XPS showed the migration of fluoride part to the surface and accumulation after annealing to minimize interfacial free energy.Ordered structure of fluorinated chains on the surface was studied by XRD.The results of XRD showed that the fluorinated chains would be rearranged to transform into a double-layer packing after annealing.关键词：Polymeric film;Polyisobutylene;Fluorinated block copolymer;Oxyanion-initiated polymerization
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发布时间：2021-03-19 - 摘要：To understand the charge transport mechanism of oligo(p-phenylene vinylene) (OPV) molecular wires,twelve OPV molecular wires were synthesized,whose anchoring groups were thioacetyl (SAc) and amine (NH2),respectively.Conductive probe-atomic force microscopy and scanning tunneling microscopy-break junction (STM-BJ) methods were employed for the characterization of the electron transport properties of these OPV wires.A detailed analysis of the single-molecular resistance as a function of molecular length,temperature as well as electric field,revealed a clear transition of charge transport mechanism from tunneling to hopping at a critical length of 2 nm.The effect of anchoring groups on the charge transport properties was investigated by comparing the single-molecular conductance of OPV wires terminated with dithioacetyl and diamine groups.The results showed that the anchoring groups indeed affect the contact resistance,but they do not change the intrinsic charge transport mechanism.Moreover,the electronic properties of the OPV wires were studied theoretically using a combination of density functional theory and non-equilibrium Green's functions method.The calculated results demonstrated that the energy difference between the frontier molecular orbitals and the metal Fermi level played an important role in controlling the conduction mechanism of the OPV wires.关键词：Oligo(p-phenylene vinylene)s;Molecular wires;Charge transport mechanism;Anchoring group
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发布时间：2021-03-19 - 摘要：A series of sulfonic acrylate ternary random copolymer surfactants (APSA) were synthesized through radical solution copolymerization,using styrene (St),butyl acrylate (BA) and 2-acrylamide-2-methyl- propanesulfonic acid (AMPS) as raw materials.The structure of APSA copolymers was demonstrated by Fourier transform infrared spectroscopy (FTIR),nuclear magnetic resonance spectroscopy (1H-NMR,13C-NMR),gel permeation chromatography (GPC) and elemental analysis.In addition,the micromorphology,size and aggregation behaviors of APSA micelles were investigated by dynamic light scattering (DLS),transmission electron microscopy (TEM),surface tension analysis,steady state rheological analysis and steady-state fluorescence.TEM results showed that APSA micelles displayed as core-shell spheres,and the thickness of hydrophilic layer on the surface of APSA micelles increased with increasing the content of anionic hydrophilic sulfonic groups.Steady rheology analysis indicated that the viscosity of APSA solutions increased with increasing the content of sulfonic groups at lower shear rates,the interactions among micelles increased,and the pseudoplastic behavior was also improved.However,the viscosity of APSA solutions was almost invariable at higher shear rates.DLS and surface tension results suggested that the surface tension of APSA1 solution decreased to 43.26 mN/m.The surface tension and critical micelle concentration (cmc) increased with increasing the content of hydrophilic groups.When the APSA concentration was lower than cmc,the light scattering intensity was very low and increased very slowly,but the light scattering intensity displayed abrupt linear increasing trend when the APSA concentration was greater than cmc.At the same time,the aggregation number of APSA micelles increased greatly.DLS analysis also showed that aggregation behavior among micelles was enhanced with increasing APSA concentration,as well as the number of molecules inside the micelles,resulting in the increase of micelle size and dispersion index.Furthermore,the micelle size and dispersion index also increased with increasing the content of hydrophilic groups.It was also found from the fluorescence spectra that I1/I3 values decreased from 1.8 to 1.2 and then leveled off with increasing APSA concentration,the absorption peak of pyrene (0,0) shifted from 334 nm to 334 nm,I338/I334increased from 0.7 to 1.45.The above-mentioned results certified that the hydrophobic groups tended to aggregate and form hydrophobic microdomains,and pyrene molecules transferred from the aqueous polar phase to micellar interphase.It became more difficult for molecules to aggregate to form micelles with increasing the content of hydrophilic groups,and the formation velocity of micelles was also decreased.关键词：Radical solution copolymerization;Sulfonic acrylate;Polymer surfactant;Copolymer micelles;Aggregation behaviors
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发布时间：2021-03-19 - 摘要：A bovine serum albumin (BAS) molecule surface-imprinted material with high performance was prepared through molecular design and process planning.The hydroxyl groups on crosslinked polyvinyl alcohol (CPVA) microspheres were first made to be esterified with methyl acryloyl chloride (MAC) as reagent,and a great deal of polymerizable double bonds were introduced onto the surfaces of the microspheres,forming modified microspheres MA-CPVA.Subsequently,with MA-CPVA as matrix and with cationic acryloxyethyltrimethyl ammonium chloride (DAC) as functional monomer as well as with N,N'-methylene bisacrylamide (MBA) as crosslinker,in a aqueous solution,BAS surface-imprinted material MIP-PDAC/CPVA was smoothly prepared.In this imprinting process,the strong electrostatic interaction between the host-guest molecules was the foundation,and the graft-polymerization of DAC and the imprinting of BAS were carried out synchronously.The product microspheres MIP-PDAC/CPVA were characterized by FTIR and SEM.On this basis,the macromolecule recognition character of MIP-PDAC/CPVA microspheres for BAS was examined in depth.The experimental results show that MIP-PDAC/CPVA microspheres possess excellent binding affinity and very high recognition selectivity.The binding capacity of BAS on MIP-PDAC/CPVA microspheres reaches up to 108 mg/g,and the coefficient of selectivity of MIP-PDAC/CPVA towards BAS relative to the constrast protein bovine hemoglobin (BHb) actually gets up to 60.2.关键词：Bovine serum albumin;Acryloxyethyltrimethyl ammonium chloride;Surface-imprinting;Graft-polymerization;Macromolecular recognition
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发布时间：2021-03-19 - 摘要：A low band gap conjugated polymer (P1) containing benzodifuran (BDF) units was synthesized via Stille coupling polymerization.The polymer exhibited good solubility in common organic solvents (chloroform,chlorobenzene,dichlorobenzene,etc),excellent film forming properties and wide absorption range in visible region.Density function theory (DFT) studies showed P1 had planar molecular structure,which benefited the arrangement of molecular chain.The molecular weight of P1 was measured by gel permeation chromatography (GPC) and the thermal property was investigated with thermogravimetric analysis (TGA).A primary bulk heterojunction-typed polymer solar cell was fabricated with the blend of P1 and PC71BM as the photosensitive layer.The device based on structure of ITO/PEDOT:PSS/P1:PC71BM(1:1.5,weight ratio,with DIO as additive)/Ca/Al showed an open-circuit voltage (Voc) of 0.80 V,a short circuit current of 5.66 mA/cm2(Jsc),a fill factor (FF) of 65.14%,and a power conversion efficienct (PCE) of 2.96% under the illumination of AM 1.5,100 mW/cm2.The result shows that the introduction of BDF groups can achieve a low bandgap polymer,and the polymer based on BDF groups has great potential in polymer solar cells.关键词：Benzodifuran;Low band gap;Photovoltaic;Conjugated polymer
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发布时间：2021-03-19
Research Article
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