最新刊期
卷 ， 期 9 ， 2012
- 摘要：A novel fluorescent complex was synthesized with Eu3+,acrylic acid (AA) and 1,10-phenanthroline (Phen),using absolute ethyl alcohol as solvent.The chemical structure and fluorescent property of the complex were characterized by elemental analysis,FTIR,1H-NMR spectroscopy and fluorescence spectroscopy.The results indicted that the fluorescent complex Eu(AA)3Phen was successfully prepared and had an excellent fluorescence property.Afterwards,a series of novel fluorescent copolymer emulsions were prepared via soap-free emulsion polymerization,with methyl methacrylate (MMA) and acrylamide (AM) as main monomers,Eu(AA)3Phen as functional monomer and 4-vinylbenzenesulfonic acid sodium salt (NaSS) as polymerizable emulsifier.The structures of the copolymers were characterized by FTIR.The results revealed that copolymerization occurred among MMA,AM,NaSS and Eu(AA)3Phen,and the copolymers were prepared successfully.The influences of the dosages of Eu(AA)3Phen on the stability of copolymer emulsions were studied by the technique of centrifugation,indicating that the emulsions had excellent stability.The average particle size and distribution were measured by photon correlation spectroscopy (PCS),and the result showed that the hydrodynamic diameters and distribution of micelles both increased gradually with the contents of Eu(AA)3Phen.The morphology of latex particles were examined by transmission electron microscopy (TEM),and the images showed that the particles were sphere-shaped,whose size was in good agreement with the measurement results from PCS.In addition,the emulsions were characterized by fluorescence spectroscopy,and it was found that copolymer emulsions exhibited marked luminescence at the wavelength of 594 and 619 nm.More importantly,the fluorescence intensity increased gradually with the contents of Eu(AA)3Phen in the copolymers.关键词：Rare earth;Luminescence;Soap-free emulsion polymerization;Fluorescent copolymer
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发布时间：2021-03-19 - 摘要：Four kinds of electrospun fibrous membranes,random and highly aligned poly(ethylene terephthalate) (PET) fibrous membranes,and random and highly aligned PET/CA (citric acid) fibrous membranes,were prepared by electrospinning technology.The mechanical properties and wetting behavior of the four kinds of electrospun fibrous membranes were studied.Meanwhile,the influence of the thickness of electrospun fibrous membranes on mechanical properties was discussed.Studies have shown that the mechanical properties of aligned PET fibrous membranes are much better than those of random PET fibrous membranes,yet the elongation of aligned PET fibrous membranes are slightly less than that of random PET fibrous membranes.The water contact angle of PET fibrous membranes was decreased from 132.3? to 0? with the addition of citric acid.The wetting behavior of aligned PET/CA fibrous membranes is better than that of random PET/CA fibrous membranes.Meanwhile,the mechanical properties of random PET/CA fibrous membranes dramatically decreased due to the addition of citric acid,yet the mechanical properties of aligned PET/CA fibrous membranes slightly decreased.The elongation of random PET/CA fibrous membranes increased from 284.1% to 444.5%.The mechanical properties of random fibrous membranes improved with increasing the thickness of membranes first and then little decreased.The mechanical properties of aligned fibrous membranes improved with increasing the thickness of membranes.关键词：Poly(ethylene terephthalate);Citric acid;Aligned fibers;Wetting behavior;Mechanical properties
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发布时间：2021-03-19 - 摘要：N-allylpyridinium chloride ionic liquid (［APy］Cl) was synthesized by one-step process and its property of dissolving cellulose was investigated.The results showed that the solubility of cotton linter pulp cellulose (degree of polymerization (DP)=556) was 19.71% at 120℃,and the thermostability of regenerated cellulose (DP=223) seriously decreased.The performance of regenerated cellulose could be enhanced by adding cosolvents into ［APy］Cl.Compared with other cosolvent (DMSO,DMF or pyridine),the ［APy］Cl/DMAc composite solvent exhibited a better dissolution to cotton linter pulp cellulose.The solubility was 15.03% and the DP of regenerated cellulose was 403 at 100℃ with lower cost.But the solubility of ［APy］Cl/DMAc was only 1.36% at 70℃.So,the ［APy］Cl/1-N-ally1-3-methylimidazolium chloride ionic liquid (［AMIM］Cl) solvent was discussed afterwards.The results showed that the solubility of cotton linter pulp was 8.78% and the DP of regenerated cellulose was 516 in ［APy］Cl/［AMIM］Cl composite solvent at 70℃.Besides,［APy］Cl/DMAc and ［APy］Cl/［AMIM］Cl were liquid respectively below the melting point of ［APy］Cl and they were the potential cellulose solvent.The FTIR,XRD and TGA spectrograms showed that these solvents were non-derivatizing solvents for cellulose,the cellulose was changed from cellulose Ⅰ to cellulose Ⅱ during dissolution and regeneration and the thermal stability of the regenerated cellulose slightly decreased.The photographs and SEM image indicated that the regenerated cellulose membrane was homogeneous and dense.关键词：Ionic liquid;Cellulose;Synthetize;Cosolvent;Dissolution
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发布时间：2021-03-19 - 摘要：The graft-polymerization of sodium 4-styrene sulfonate (SSS) was performed on the surfaces of crosslinked polyvinyl alcohol (CPVA) microspheres using cerium salt-hydroxyl group redox initiation system,and the grafted microspheres CPVA-g-PSSS,on which the strong anionic polyelectrolyte PSSS was grafted,was obtained.The chemical structure and physicochemistry characters of CPVA-g-PSSS microspheres were adequately characterized by infrared spectrum (FTIR),scanning electron microscope (SEM) and determination of zeta potential.On this basis,the adsorption property of CPVA-g-PSSS microspheres for 5-fluorouracil (5-FU),namely the drug carrying ability,was mainly investigated and the adsorption mechanism was discussed.The in vitro release behavior of the drug-carried microspheres was also examined.The experimental results show that cerium salt-hydroxyl group redox initiation system can effectively initiate the graft polymerization of SSS on CPVA microspheres,and under the suitable conditions,the grafting degree of PSSS can reach 16.1 g/100g.In the acidic medium,the grafted microspheres CPVA-g-PSSS exhibit very strong adsorption ability for 5-FU by driving of electrostatic interaction.The adsorption capacity can get up to 105 mg/g,displaying the high efficiency of drug-loading.The in vitro release behavior of the drug-carrying microspheres is highly pH-dependent.In the medium of pH=1,the drug is not released,while in the medium of pH=7.4,the burst release phenomenon will be produced,displaying an excellent colon-specific drug delivery behavior.关键词：Sodium 4-styrene sulfonate;Crosslinked polyvinyl alcohol microspheres;Graft polymerization;5-Fluorouracil;pH-dependence;Colon-specific drug delivery
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发布时间：2021-03-19 - 摘要：A series of poly(lactid acid) (PLA)/mineral filler composites have been prepared by melt blending.Crystallization and melting behaviors of PLA composites containing calcium carbonate (CaCO3), montmorillonite (MMT) and attapulgite (AT) have been studied by differential scanning calorimetry (DSC), respectively.The results exhibited that MMT and AT did not obviously influence the slow-cooling crystallization of PLA, whereas CaCO3 effectively facilitated the crystallization of PLA in this process.The crystallization enthalpy (Hc) increased with increasing the content of CaCO3 at a cooling rate of 2.5 K/min.Moreover, the type and content of the fillers played an important role in the cold crystallization and melting remarkably.Low-content mineral fillers would promote the nucleation in the cold crystallization of PLA, among which MMT was the best effective.Meanwhile, different mineral fillers with relatively high contents would affect the crystal structures of PLA, yielding various types of DSC curves.关键词：PLA;Mineral fillers;Differential scanning calorimeter;Crystallization;Double melting
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发布时间：2021-03-19 - 摘要：A cyclic ketene acetal of 2-methylene-1,3-dioxepane(MDO) was prepared and undergone free-radical ring-opening polymerization with acrylic acid (AA) to produce biodegradable copolymers P(AA-co-MDO) which had ester groups in the backbone and carboxyl as pendant functional groups.The structures and weight-average molecular weights(Mw) were characterized by Flourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and multi-angle laser light scattering measurements (MALLS).Obvious changes of molecular weight could not be observed when the ratio of MDO to AA was varied.The thermal property of the copolymers was investigated by differential scanning calorimetry and termogravimetric analysis.It was found that the copolymers showed evident glass transition temperature.The thermostability of the copolymers declined as the MDO content increased, but still maintained at a high level to meet the requirement of production process of detergent builders.The X-ray diffraction results indicated that P(AA-co-MDO) copolymers were amorphous and these copolymers may have good biodegradable performance.The degradation experiments of copolymers in activated sludge revealed that the more MDO content was in copolymer, the faster degradation rate of the copolymer was.The performance of the copolymers and other detergent builders was studied and the results showed that the copolymers possessed high chelating capacity, good dispersancy and favorable pH buffer ability,and therefore were ideal detergent builders.关键词：Detergent builders;Copolymers;Biodegradability
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发布时间：2021-03-19 - 摘要：SF-PU composite hydrogel was prepared successfully by incorporating silk fibroin aqueous solution into polyurethane prepolymer (PU)which was synthesized using poly(ethylene glycol) (PEG),poly-(polyethylene glycol) (PPG) and isophorone diisocyanate (IPDI) as the main materials.The structure and component of hydrogels as well as their interior morphology were characterized with the methods of ATR and SEM.Influences of hydrogels of different SF/PU and PEG/PPG proportions on their thermal properties and swelling behaviors were further investigated by means of DSC measurements and swelling tests,respectively.Results showed that the prepared composite SF-PU hydrogels have a kind of three-dimensional porous network structure.DSC curves of the hydrogels exhibited unique thermal properties,that the glass transition temperatures (Tg) and the crystallization changed lightly corresponding to the changed hydrogel compositions.Whats more,different composition hydrogels indicated similar excellent swelling dynamics and varied swelling ratios; the equilibrium swelling ratio (ESR) increased with the decrease of the SF content which could be seen as the cross-link agent; when the composition of hydrogel was SF/PU=1/25,PEG/PPG=2/1,the ESR could reach 440%.In the initial swelling stage,the hydrogels much fit the Fickian diffusion,while the Schott second-order kinetic equation was appropriate to describe the whole swelling process.All the above unique features of SF-PU composite hydrogels made them a promising material for the prosthetic disc nucleus in the future.关键词：Silk fibroin;Polyurethane;Hydrogel;Swelling kinetics
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发布时间：2021-03-19 - 摘要：In order to meet the requirements of middle-high temperature proton exchange membrane full cells,different weight ratio (Am-PAEK/SPAEKS) composite membranes are prepared by solution casting of the high degree sulfonated poly(aryle ether ketone sulfone)(SPAEKS) and poly(aryle ether ketone) with amino groups (Am-PAEK) as raw material.Cross-linked composite membranes are obtained by a heating reaction at 160℃.The cross-linked structure is formed in the membrane by acid-base cross-linking reaction between amino and sulfonic acid groups.The composite membranes show good thermal stability,dimensional stability and methanol permeability.The Am-PAEK/SPAEKS-C-3 membrane exhibits excellent proton conductivity up to 0.0892 S/cm at 120℃,which is superior to that of Nafion membrane (0.062 S/cm) and SPAEKS membrane (0.0654 S/cm) under the same test conditions.The water diffusion coefficient of the Am-PAEK/SPAEKS-C-3 membrane reaches 3.5110-9 cm2/s that is lower than that of SPAEKS membrane (8.9610-8 cm2/s).The methanol diffusion coefficient (0.1410-6 cm2/s) of Am-PAEK/SPAEKS-C-3 membrane is lower than that of pure SPAEKS membranes (0.8510-6 cm2/s) and the Nafionmembrane (210-6cm2/s).Experimental data confirm that Am-PAEK/SPAEKS-C-3 membrane has high proton conductivity and low methanol diffusion coefficient in middle-high temperatures.All the results indicate that Am-PAEK/SPAEKS-C-3 crosslinked composite membrane may be a potential material for middle-high temperature proton exchange membrane fuel cells applications.关键词：Sulfonated poly(aryle ether ketone sulfone);Contain amino poly(aryle ether ketone);Composite membrane
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发布时间：2021-03-19 - 摘要：The sulfonated graphene supported polyaniline composites (sGNS/PANI) with different hierarchical structures were synthesized successfully via an interfacial polymerization method using sGNS as the substrate,and the influence of oxidant type on chemical composition,morphological structure and supercapacitive performance of the composites was investigated systematically.The results showed when ammonium persulfate (APS) was used as the oxidant the PANI had the highest yield and degree of oxidation.The hierarchical composite of sGNS-supported vertically aligned PANI nanorod arrays was formed,and the PANI nanorod arrays possessed higher degree of conjugation and crystallinity,thus the composite exhibited high specific capacitance (497 F g-1),excellent rate capability and cycling stability (5.7% capacitance loss after 2000 cycles).As oxidant was FeCl3,the PANI had a very low productivity,and the PANI was coated onto the surface of sGNS and formed a thin film.And the composite possessed the lowest specific capacitance (228.5 F g-1),but charge-discharge cycle performance was rather good (87.4% retention rate of capacitance after 2000 cycles).When KMnO4 was used,the PANI with agglomerated particles randomly accumulated on the surface of sGNS,and the PANI displayed amorphous structure.The composite showed a relatively high specific capacitance of 419.6 F g-1,but the rate capability and cycling stability (19.9% capacitance loss after 2000 cycles) were poor.关键词：Polyaniline;Sulfonated graphene;Interfacial polymerization;Supercapacitors
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发布时间：2021-03-19 - 摘要：A sulfonated lignin-based polymer, SBAL, was prepared by sulfomethylation, etherification and polycondensation reaction using alkali lignin from the alkaline pulping spent liquor of bamboo as main material. TEM and 1H-NMR results showed that the structure of SBAL was loose spherical, the center of which was the hydrophobic skeletons of lignin, the long side chains with sulfonic and carboxyl groups were distributed on its surface. GPC and potentiometric titration results showed that the Mw of SBAL reached 24880 Da, 7.38 times of the alkali lignin, and the sulfonic group content was 2.70 mmol穏-1. The adsorption properties and the dispersion efficiencies of SBAL were investigated by means of isothermal adsorption, XPS, zeta potential and rheological experiments. At pH 3~12, the SBAL as dispersant can remarkably reduce the viscosity of alumina slurry. The sulfonic, carboxyl and phenolic hydroxyl groups of SBAL are ionized gradually as pH increasing, which makes the SBAL molecule chains spread well in the alkali condition. With the increase of pH, the adsorption amount of SBAL on alumina particles decreases and the adsorption configuration changes from compact to loose. When pH is lower than isoelectric point of alumina, the main adsorption force between SBAL and alumina particle is electrostatic adsorption, however, when pH is more than isoelectric point, non-static specific adsorption dominates the main force. When the dosage of SBAL is less than the critical dosage (0.5wt%), SBAL generates an electrostatic repulsion between particles by monolayer adsorption on alumina surface, moreover, when the SBAL dosage is more than the critical one, SBAL may adsorb on alumina particles in the form of aggregation and improve the steric hindrance action.关键词：Alkali lignin;Sulfonated lignin-based polymer;Alumina;Adsorption;Dispersion
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发布时间：2021-03-19 - 摘要：A block copolymer, poly(2-cinnamoyloxyethyl acrylate)-block-poly［(tert-butyl acrylate)-ran-(styrene)］ (PCEA-b-P(tBA-r-St)), was synthesized by ATRP. Some factors, such as solvents, monomer concentration, and the reserved ratio of end initiating groups after the preparation of the first block influencing the PDI and the control of molecular weight in the synthetic process were discussed. Acetonitrile was found as one of the most suitable solvent in using ATRP to synthesize poly(2-trimethylsilyloxyethyl acrylate) (PHEA-TMS) due to the outstanding controlling of the polymers molecular weight distribution as low as close to monodisperse. The structure of the prepared diblock copolymer was confirmed as PCEA53-b-(PtBA111-r-PS138) with 1H-NMR analysis. It shows a narrow distribution of molecular weight of 1.18 determined by GPC method. This diblock copolymer can be dispersed directly in some selective solvents, such as 1-chlorodecane and cyclopentane, to form the micelles. It was investigated by TEM that a unique aggregated-cylinder structure was formed by the self-assembly of the block polymer in 1-chlorodecane following slow evaporation of the solvent because 1-chlorodecane has a very high boiling point of 223℃. While in cyclopentane which has a much lower boiling point of 49.3℃, due to the quick volatilization of solvent the block copolymer only self assembled into some short rodlike micelles.关键词：Block polymer;Random polymerization;ATRP;Self-assembly
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发布时间：2021-03-19 - 摘要：Ultrahigh molecular mass polyethylene (UHMWPE) and statistical copolymer of ethylene and 1-hexene (PEH) were used to prepare UHMWPE/PEH blends with relatively low UHMWPE concentrations. UHMWPE forms network structure in the blends with UHMWPE concentrations above a critical value of c=1wt%. The influence of the formed UHMWPE network on the interfacial diffusion behaviors of multilayer UHMWPE/PEH blends was investigated by applying small oscillatory shear rheology. The interfacial diffusion coefficients of multilayer UHMWPE/PEH blends were obtained from the rheological data. It is found that the diffusion coefficients are time-dependent and two diffusion regions are distinct before the diffusion reaches the plateaus according to the changes of diffusion exponent n in the relation of D-t n,which implies an approximate Fickian diffusion behavior in region Ⅰ (c 1.0wt%) and an obvious deviation from the Fickian diffusion behavior in region Ⅱ (c1.0wt%). With the formation of UHMWPE network in the UHMWPE/PEH blends, deviation from the Fickian behavior for diffusion of multilayer UHMWPE/PEH blends becomes significant. The above results help facilitate the industrial processing of multilayer polyolefins, which is related to the interfacial diffusion.关键词：Polyethylene blends;Network;Interfacial diffusion;Rheology
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发布时间：2021-03-19 - 摘要：To obtain accurate prediction of the performance of sealing rubbers and to optimize the processing parameters,the P-V-T data of three kinds of sealing rubbers: styrene-butadiene rubber,nitrile-butadiene rubber and nitrile-butadiene/chlorobutyl rubber composites,were studied.The parameters of Tait equations were calculated and compared with experiments.The results showed that the P-V-T relationship calculated by Tait equation was agreed well with the observation results.The value of parameter b3 and b4 were constants which mean the parameter B was a constant.The average residuals of P-V-T data between theoretical calculation and experimental values were all less than 0.02.It showed that the Tait equation can be used to describe the P-V-T relationship of these sealing rubber materials.Thermal expansion coefficients () and isothermal compressibility () of the three rubbers were evaluated form Tait equations.The experimental results showed that in these three rubbers,NBR has the best size stability and NBR/CIIR has the worst size stability.Furthermore,the thermal expansion coefficients of NBR/CIIR would reduce significantly with the decrease of pressure.Through accurate description of the changes of and with different pressures and temperatures for the three sealing rubbers,a method with the function of guiding processing and applications research was obtained.关键词：P-V-T;Tait equation;Thermal expansion coefficient;Isothermal compression coefficient
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发布时间：2021-03-19 - 摘要：Poly(1,4-cyclohexanedimethyl-1,4-cyclohexanedicarboxylate) (PCCD) polymers were prepared by melt polycondensation of 1,4-cyclohexanedimethanol (CHDM) and 1,4-cyclohexanedicarboxylic acid (CHDA). The impact of cis-trans ratio of the incorporated CHDA on the phase and optical properties of PCCD was investigated, and the results indicated that amorphous PCCD with high transmittance can be obtained when the initial cis-CHDA content was no less than 40%. Three kinds of titanic compounds including tetrabutyl titanate (TBT), tetraisopyl titanate (TPT) and TiO2/SiO2 blend (C-94) were used as catalysts in PCCD polyermerzition, and TBT exhibited the highest activity. The influence of TPT content on molecular weight was then investigated. GPC measurements, 1H- and 13C-NMR tests were performed in order to evaluate the impact of the initial CHDM/CHDA molar ratios on PCCDs molecular weight. It was found that the molecular weight increased sharply when CHDM was used in slight excess and then decreased with increase of CHDM/CHDA molar ratio. The excess of CHDM over CHDA used for PCCD preparation must be controlled precisely in order to achieve high molecular weight because CHDM had relatively low volatility according to the NMR spectroscopy. Finally the effects of preparing conditions, such as polymerization time and temperature, were evaluated. Reaction time for obtaining the maximum molecular weight increased with increasing initial molar ratio of CHDM to CHDA. It was shown that the PCCD polyester prepared by the condensation of CHDM and CHDA (molar ratio of 1.04∶1) in the presence of 30mg/kg of TPT, with a residence time more than 120min above 275℃, had a desirably high molecular weight.关键词：Poly(1;4-cyclohexanedimethyl-1;4-cyclohexanedicarboxylate);Amorphous;Cis-trans isomer;Molecular weight;Molar ratio
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发布时间：2021-03-19 - 摘要：To verify the feasibility of using drug-loaded ultrafine fibers in local chemotherapy of cancers, ability of the paclitaxel (PTX)-loaded polylactide (PLA) fiber mats to induce cell apoptosis of U14 cervical cancer cells and to inhibit the growth of the xenograft U14 cervical cancers was examined. The U14 cells were incubated for 48 h in the presence of the fiber mats, and the cell apoptosis rate (CAR) was evaluated by flow cytometry (FC) with Annexin V-FITC and PI double staining. The FC results showed that after 48 h incubation in the presence of PTX-loaded fibers (equivalent PTX content 40 g/mL), the total CAR (25.6%) was significantly higher than the control group (1.0%) and the Fiber-only group (1.5%). U14 cervical cancer models were established in balb-c mice. The tumor body was separated from the surrounding tissues and wrapped with nano-fiber mats in a coverage ratio of 70%~75%. Seven and fourteen days after surgery, 5~7 animals in each group were sacrificed, and the tumors were separated, cut down, photographed and weighed. The tumor inhibition rates (TIR) were calculated. The results showed that the PTX-loaded (33 wt%) fiber wrapping led to significant inhibition of the growth of U14 cervical cancers (TIR=48%~56%). Although the Fiber-only group animals underwent surgery and their tumors were wrapped with the fiber mats, their tumor weights were not significantly different from those of the Control group, indicating that the PLA fibers themselves did not inhibit the tumor growth, and the inhibitory effects observed in the Fiber-PTX group was due to the released PTX from the fibers. In conclusion, the PTX-loaded PLA fiber mats displayed significant inhibition to the xenograft U14 cervical cancers. They are suitable for local chemotherapy of the U14 cervical cancers before and/or after surgery.关键词：U14 cervical cancer;Polylactide nanofibers;Paclitaxel;Apoptosis
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发布时间：2021-03-19 - 摘要：The physical gelation of PVC plastisol is an important procedure in rotational molding processes, at the early stage of which the variation characteristics of plastisol viscosity determine its distribution on the mold surface, then affect the quality of products.On the basis of the unsteady temperature fields of the nickel mould and PVC material simulated by finite element method, the evolution and distribution of PVC material structures are calculated according to a theoretical model fitting well with experimental results, and then the plastisol viscosity and its evolution characteristics are obtained by the material structure-performance relationship.Hence the effect of different plasticizers on the physical gelation process of PVC materials is compared and analyzed.The results show the that PVC plastisol close to a mold surface, gets faster heating rate and earlier gel transition because of its smaller heat resistance.During the heating process, the viscosity of the PVC material is first reduced to a minimum, then increases rapidly due to the start of the gel transition.The micro mechanism of the gelation process is that the solution of PVC in the plasticizer and the swelling of PVC particles by the plasticizer are both strengthened, while the macro picture is a sharp increase in viscosity which makes the material stop flowing.Different plasticizers have different impacts on the evolution of material structure and plastisol viscosity, which is mainly due to their different lengths of chains.For the rotational molding process, the PVC thickness distribution depends on three important factors appeared during the physical gelation process of PVC plastisol: the minimum viscosity determined by the plastisol, the rate of the gelation process and the gelation temperature.关键词：PVC plastisol;Physical gelation;Rotational molding;Finite element method;Plastisol viscosity
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发布时间：2021-03-19
Research Article
- 摘要：A novel flame-retardant and anti-dripping copolyester (PBPET) was synthesized by polycondensation of terephthalic acid (TPA) and ethylene glycol (EG) with bis(hydroxyethylether) of bisphenol A (BHEEB) and ［(6-oxido-6H-dibenz［c,e]1,2］oxaphosphorin-6-yl)methyl］butanedioic acid (DDP). The chemical structure of the PBPET was characterized with 1H-NMR spectroscopy and inductively coupled plasma atomic emission spectroscopy (ICP-AES), and the thermal stability was investigated by thermogravimetric analysis (TGA). The flammability of the copolyesters was characterized by the limiting oxygen index (LOI) and UL-94 vertical test. TGA results suggested that BHEEB could effectively improve the thermal stability of the copolyesters, and the residues of PBPET at 600℃ in N2 (wt600R) reached 18.0 wt%. The flame-retardant tests proved that by incorporating both BHEEB and DDP into the polyesters, the resulting copolyesters exhibited expected flame retardance with an LOI value of 37.0 and a UL-94 V-0 rating. Moreover, the anti-dripping behavior of the copolyesters was improved by the incorporation of BHEEB.
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发布时间：2021-03-19
Research Bulletin
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