最新刊期
卷 ， 期 4 ， 2001
- 摘要：The viscosity enhancement of PAM aqueous solution with LW-1 type additive was studied．The effect of some varibles such as the content of the additive,ion concentration,shear strength,PAM concentration and pH valueon the increase in viscosity of the solution was discussed systematically．It was shown that the viscosity could be increased by 2～3 times when the content of the additive was up to 8 mg/L．Moreover,a probable machanism of the viscosity enhancement was suggested．
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发布时间：2021-03-19 - 摘要：The effect of three mixing procedures on compatibilized nylon-6／PPO blends was investigated．A twinscrew extruder was used in the experiment．(A) The mixture of nylon-6,PPO and TPEg was extruded；(B) the preblends of nylon-6 and TPEg through the extruder was co-extruded with PPO；(C) the preblends of PPO and TPEg through the extruder was co-extruded with nylon-6．The experimental results showed that the rational adaptation of processing method greatly affected the phase structure of the blend,and consequently affected the final properties of materials,such as mechanical properties,thermal properties and dimensional stability．The impact strength of the compatibilized nylon-6／PPO blends prepared via mixing procedure (C) is much higher than that of the compatibilized nylon-6／PPO blends prepared via mixing procedure (A)and (B)．The reason is that the reactivity 0f—OH groups on PPO molecules is much lower than that of—NH2 groups on nylon molecules．In mixing procedure (C),PPO was first preblended with TPEg which allowed the—OH group to react with part of the maleic anhydride groups,then in the following CO-extrusion with nylon-6 the un-reacted maleic anhydride groups further reacted with—NH2 groups on nylon molecules．With the two steps a good interface is formed and greatly improves the impact strength of the blends,and the material has the property of super toughness．
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发布时间：2021-03-19 - 摘要：A new functional electroluminescent copolymer (DB-PV) containing an ionic conductive block—crown ether and an electronically conductive 0ne——alkoxy substituted poly(phenylene vinylene) in the main chain was synthesized．The copolymer was characterized by FT-IR,1H-NMR,DSC,elemental analysis,etc．The photoluminescence properties of the copolymer in chloroform solutions and in films were investigated,respectively．The results show that DB-PV is an ideal functional blue-emission polymer fitted for fabricating light-emitting electrochemical cells,because it can be soluble in chloroform,pyridine and possesses a good film-forming property．
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发布时间：2021-03-19 - 摘要：Three Co diimine complex-TiCl4 catalysts for slurry copolymerization of ethylene and 1-butene with AlR3 as cocatalyst in the absence of MAO were synthesized and were used to prepare high branching degree copolymers of ethylene with 1-butene．It is found that properties of the catalysts are affected by the characteristics of diimine ligands．the results indicate that the complex catalyst prepared with L1 ligand exhibits the property of oligomerization and copolymerization in-situ．The copolymers prepared by CL1 catalyst are plastics and elastomers,they show high branching degree (36.0～61.5 branch number／1000C) and low density (O.885～0.910 g/m3),when the 1-butene content of feeding was below 10％,the 1-hutene content in the copolymers is higher than that of feeding．
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发布时间：2021-03-19 - 摘要：A novel pH—sensitive hydrogel was obtained by copolymerization of telechelic poly(1,3-dioxolane) (PDXL) with acrylic acid (AA)．The synthesis and swelling properties of networks were discussed．The networks can swell in water and organic solvents．It can swell faster and has higher equilibrium swelling degree in water of pH＞7 than in that of pH＜7．It is due to the easier ionization of—COOH groups in basic solution．In addition to the pH sensitivity,the hydrogels also have special characteristics：the networks containing polyacetal segments (PDXL) can degrade by acid in different solvents．Degraded residues including DXL and few other heterocycles were determined by IR and GC-MS analysis．The result showed that after degradation,linear PDXL segments were broken and became closed cycles in different ways．The intelligent hydrogel prepared has potentials in biosystems such as intelligent drug release systems．
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发布时间：2021-03-19 - 摘要：Heterogeneous chelate filter membranes with high chelate capcity for Cu2+ have been prepared by using a chelate resin D418 polysulfone (PSF)．Various process parameters affecting the properties of the chelate membrane,such as the blending ratio,chelate resin grain size and temperature of solution casting have been wildly studied. The relationship among the chelate amount,pH value and the concentrations of the metallic ion solution were examined．Under appropriate conditions,the chelate filter membrane had a capcity of 700 μg/cm2 for Cu2+．Sorpting isotherm could be expressed by the Freundlich sorption model．The dynamic experiment indicated that the sorption and desorption could be realized simultaneously．
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发布时间：2021-03-19 - 摘要：The thermal stability,crystallization behavior and biodegradability of poly(β-hydroxybutyrate) (PHB) grafted with naleic anhydride (MA) were studied by DSC,TGA,optical microscopy and WAXD. The results showed that thermal stability of maleated PHB was obviously improved,comparing with that of pure PHB. The temperature of decomposition was enhanced about 20℃．After grafting MA,the crystallization behavior of PHB changed evidently. The rate of spherulite growth decreased,the crystallization temperature from the melt state reduced,and the cold crystallization temperature from the glass state increased．With the increase in graft degree,the banding texture of spherulite became more distinct and orderly．Moreover,the introduction of MA groups promoted the biodegradation of PHB.
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发布时间：2021-03-19 - 摘要：The products of N-chloro derivatives (N-Cl-PAM) of polyacrylamide (PAM) with water and 1-propanol at pH 7.5 were characterized by X-ray photoelectron spectroscopy (XPS)．The N-C-PAM reacted with water to form the polymers with alkyl acyl urea structures．N-Cl-CB groups (91.8％) of N-Cl-PAM were converted to —CONHCONH— (78.0％) and—NHCOO— (13.8％) during the reactions of N-Cl-PAM with 1-propanol aqueous．These results illustrate that under neutral papermaking conditions NCl-PAMs can react by themselves to form net work structures or N-Cl-CB groups of N-Cl-PAM react with hydroxyl groups of cellulose and hemicellulose to form covalent bonds．The formation of the structures results in great improvement of dry and wet-strengths.
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发布时间：2021-03-19 - 摘要：A new kind of macroinitiator for nitroxide-mediated polymerization was synthesized via the atom transfer radical copolymerization of styrene (St) or methyl methacrylate (MMA) with vinyl monomer containing nitroxide group．In order to gain the macroinitiator having n side nitroxide groups,the molar ratio of free radical initiator to the monomer containing nitroxide group should be at (n+1)／n in the ATRP system．The optimum conditions of atom transfer radical copolymerization between the St or MMA and vinyl monomer containing nitroxide group were studied in detail and the polymerization mechanism was discussed. The structure of the macroinitiator was also characterized by means of 1H-NMR．
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发布时间：2021-03-19 - 摘要：Chemical experiments and carbon nuclear magnetic resonance studies showed that there were two addition manners,l,2-and l,4-additions when α-butenal (crotonaldehyde),as an unsaturated aldehyde,conducted an acetalization reaction with polyvinyl alcohol．This mechanism is different from that for the acetalization reaction of polyvinyl alcohol with saturated aldehydes,which has only 1,2-addition．Crosslinking in polyvinyl butenal was mainly resulted from the 1,4-addition．Methods for calculating the acetalization degree and the ratio of 1,2-and 1,4-additions according to the results of chemical analysis have also been suggested．
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发布时间：2021-03-19 -
PREPARATION OF LLDPE USING A DUAL FUNCTIONAL CATALYTIC SYSTEM OF Ti(OBu)4-METALLOCENE/B(C6F5)3-AlEt3
摘要：Polymeriztion of linear low density polyethylene (LLDPE) using a dual functional catalytic system containing different kinds of Metallocene／AlEt3／B(C6F5)3 as copolymerization catalysts and Ti(On-Bu)4／AlEt3 as the ethylene dimerization catalyst was studied．Using the single cocatalyst AlEt3 in the catalytic system,it is easy to overcome the shortcoming of interference between two catalytic metals in a single reactor．Among the four zirconocene systems used,the most active dual functional catalytic system is[Ti(On-Bu)4／AlEt3／Et(Ind)2ZrCl2／B(C6F5)3],its activity reaches 7.5×106 gPE／molZr·h．The density of obtained LLDPE is 0.89 g／cm3 and 1-butene insertion rate11.7 mol％- 3
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发布时间：2021-03-19 - 摘要：Solution properties of dendrimer DAB(PA)n and hyperbranched polyester were studied by measuring viscosity parameters．The adsorption constant k,critical concentration ca,intrinsic viscosity[η] and intermolecular association Km were calculated．The unique behavior of intrinsic viscosity observed for the samples was explained preliminarily．The adsorption phenomenon of polymer solution is general,and the adsorption theory is also fitted for dendritic macromolecules．Multilayer adsorption was obtained in dendrimer and hyperbranched polymer solutions．The intermolecular force between macromolecules and solvent molecules (such as hydrogen bonds) is the important factor affecting the adsorption layer thickness．
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发布时间：2021-03-19 - 摘要：A coordination polymer (PAA-Eu3+-DBM) was formed by the reaction of metallorganic complex (NaEu-(DBM)4) with polyacrylic acid (MW=5000)．The coordination polymer,which is insoluble in most organicsolvents,is a white solid and can be soluble in the mixed solvent of glyceryl alcohol and isopropanol．The polymer was characterized by FT-IR,UV,electrical conductivity methods,elemental analysis,fluorescence spectrum,and its composition and structure were determinated．The rusult indicated that each Eu3+ ion is coordinated by one DBM molecule and two carboxyl units of the PAA molecules．The fluorescence spectrum indicated that the coordination polymer has good fluorescence properties．
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发布时间：2021-03-19 -
RADIATION SYNTHESIS AND PROPERTIES OF KAPPA-CARRAGEENAN- POLY(N-ISOPROPYLACRYLAMIDE) HYDROGEL BLENDS
摘要：A hydrogel blend composed of kappa-carrageenan (KC) and poly(N-isopropylacrylamide)(PNIPAM) was prepared by γ-irradiation．The blend gel prepared by this method was transparent,elastic and exhibited better mechanical strengh．The measurement of gel properties showed that the hydrogel blend had the sodium chlorideinduced phase transition behavior．The release kinetics curves of Cl- in swelling system and the relationship between the Cl- induced phase transition concentration and swelling temperature proved the conclusion．Meanwhile,the typical thermosensitive feature of PNIPAM was also preserved．- 2
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发布时间：2021-03-19 - 摘要：The ultrafine particles of linear and cross-linked poly(N-isopropyl acrylamide) were prepared by microemulsion polymerization．The polymerization kinetic equation was derived：Rp=K[M]1.16[E]-1.20[I]0.53．The average diameter of ultrafine particles was 100 nm．The structures of the ultrafine particle were studied by SEM and front chromatography techniques．The specific surface area,pore size and adsorbent maximum were 49.048 m2/g,1～10 nm and l784.8 cm3／g,respectively．The sensitive temperature in water medium was found to be 31.5℃ by turbidimetric method and visual method.
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发布时间：2021-03-19 - 摘要：3,5-Dialino benzanie-4’-diphenyl ester was synthesized and a novel liquid crystalline side-chain in-situsdf-reinforced PI film material has been achieved from co-condensation of 3．5-diamino benzonic-4’-diphenyl ester,3,3’-4,4'-oxydiphthalic anhydride (ODPA) and 4,4'-oxydianiline (ODA)．The properties of polyimides were characterized by DSC,TGA,WAXD and polanrized optical microscopy respectively．The results indicate that the properties of PIs with mesogenic units,such as molecular weight,solubility,thermal stabihty and tensile strength depend strongly on the content of mesogenic units．The molecular weight decreased and the solubility increased with the increase of mesogemc units’level．Due to the in-situ self-reinforcement of LC side-chains,the mechanical properties of PIs were greatly enhanced,for example,the maximum improvement of tensile strength and modulus reach 270％ and 300％．respectively．TGA study indicates that the 5％ weight loss temperature of PIs excess 520℃．Under polarized optical microscopy,these PIs exhibit LC behaviors in a high temperature range and exhibit nematie phase．Co-polymerization and introduction of side-chain mesogenic units decrease the regularity and syrametry of main-chain,so the side-chain liquid crystalline PIs also exhibit good solubility．
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发布时间：2021-03-19 - 摘要：The block copolymerization of styrene and ethylene was carried out using a novel catalytic system of η5-pentamethylcyclopentadienyltribenzyloxy titanuim [Cp* Ti(OBz)3] and modified methylaluminoxane (mMAO)．The influence of prepolymerization temperature,time,Ti concentration,Al(mMAO)／Ti molar ratio,styrene concentration and the amount of external addition of triisobutylaluminum (TIBA) on copolymerization were investigated in detail． It seems that the conditions of prepolymerization temperature at 40℃,Ti concentration 6.67×10-4 mol／L and Al-(mMAO)／Ti molar ratio 200 are favorable for block copolymerization of styrene and ethylene．The content of sPS segment in copolymer increases with increasing styrene concentration,but the catalytic efficiency decreased with increasing prepolymerization time．External addition of TIBA has an important effect on the formation of block copolymer and enhancing of catalytic efficiency．
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发布时间：2021-03-19 - 摘要：The sequential block copolymerization products of styrene and ethylene calalyzed by mono-titanocene catalyst η5-pentamethylcyclopentadienyltribenzyloxy titanium [Cp* Ti(OBz)3] and modified methylaluminoxane (mMAO) were fractionated by successive extraction with boiling butanone,THF and chloroform solvents．The isolated block copolymers (22.8 wt％～38.2 wt％ in total),chiefly existing in THF and chloroform soluble fractions,were characterized by 13C-NMR,WAXD,DSC and GPC methods．The 13C-NMR spectrum of copolymers showed a special structure which composed of sPS segments and branching PE segments．The WAXD pattern of copolymers displayed low crystallinity of both segments．There are long sPS segments and short PE segments in the block copolymers,which showed single sPS melt peak in DSC curves．GPC curves indicated the block copolymerization of styrene and ethylene with mono-titanocene catalytic system has single active spices character．A block copolymerization mechanism of styrene and ethylene with Cp* Ti (OBz)3/mMAO catalyst was proposed．
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发布时间：2021-03-19 - 摘要：An altemative route was investigated to prepare linear lower density polyethylene with a single monomer,ethylene．and a dual functional catalytic system for ethylene polymerization in situ using Ti(On-Bu)4／AlEt3 as dimerization catalyst and supported metallocene as its copolymerization catalyst．The two catalysts were well matched in a single reactor and the short-branched polyethylene made from this catalytic system had the characteristics of low melting point,low density,high activity and proper-granule morphology of polyethylene．
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发布时间：2021-03-19 - 摘要：The porous polymer beads of styrene divinylbenzene copolymer (GDX203) were nitrated by different proportion of HNO3(65％)-H2SO4(98％) mixture at room temperature．The nitrogen content and nitro-group were confirmed with elementary analysis and IR spectrum．The modified GDX203 was used as chromatographic stationary phase for analysis of carbonylation products of methanol．The optimum gas chromatographic stationary phase was selected from modified GDX203 0f different nitrogenous contents．The results showed that by using a modified column of proper nitrogen content all components in the reaction medium were separated at constant chromatographic temperature,especially CH3COOCH3 and CH3I can be separated completely．The gas chromatographic analysis of five components was accomplished in 6 minutes．
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发布时间：2021-03-19 - 摘要：Three novel cycloaliphatic difunctional epoxides containing symmetric or asymmetric epoxycyclohexyl moieties linked with an ether bond or with a carbon-carbon bond,3,4-epoxycyclohexylmethyl-2′,3′-epoxycyclohexyl ether (Ⅰ e),bis(2,3-epoxycyclohexyl) ether (Ⅱ e),and di(2,3-epoxycyclohexane) (Ⅲ e),were synthesized by epoxidation of their corresponding dicycloolefin,respectively．Their precursor compounds,3-cyclohexene-1-methyl-2′-cyclohexene ether (Ⅰ),bis(2-cyclohexenyl) ether (Ⅱ),and di(2-cyclohexane) (Ⅲ) were also prepared．The structure of the three epoxides and cycloolefins was confirmed by infrared spectroscopy (IR),elemental analysis (EA),and 1H-NMR spectroscopy．To evaluate the thermal properties of the cycloaliphatic epoxy compounds,a commercial bicycloaliphatic epoxy,3,4一epoxycyclohexylmethyl 3′,4′-epoxycyclohexane carboxylate(marked name ERL-4221)was used for comparison．Three epoxides and ERL-4221 were cured with HMPA,and thermal properties of the cured polymers were examined by thermomechanical analysis,differential scanning calorimetry,and dynamicmechanical analysis．The cured polymers obtained from epoxy Ⅰ e,Ⅱ e and Ⅲ e showed higher glass transition temperature,higher storage modulus,and lower coefficient of thermal expansion than those of ERL-4221．
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发布时间：2021-03-19 - 摘要：The star-shaped C60一styrene copolymer and the C60-end-capped polystyrene were synthesized by free radical copolymerization and ATRP respectively．They have been prepared into stable and compact thin films on mica by Langmuir-Blodgett (LB) technique and the π-A curves show the films could reach a quite high film pressure．Their morphology and microtribological properties were preliminarily investigated by atom force microscopy and friction force microscope(AFM／FFM)．The thin films of star-shaped C60-styrene copolymer have promising prospect in application of thin film lubricant materials．
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发布时间：2021-03-19 - 摘要：Compositions of hexamethoxymethyl melamine(HMMM)一polyol-acrylate can be cured by hybrid polymerization involving the condensation reaction of HMMM with polyol and the free radical polymerization of acrylate,with some synergetic effects such as the enhanced curing rate,energy compensation effect and the formation of polymer alloys in-situ．By investigating the gel time and the polymerization rate,it was found that the acid acts not only as the catalyst for the condensation reaction of HMMM with polyol,but also as the catalyst for the decomposition of the hydroperoxide,generating the initiating free radicals for the polymerization of the acrylate．It was also found that the use of the latent acid catalyst could greatly increase the shelf time of the hybrid polymerization system at room temperature,while maintaining the activity of the formulation at high temperature．
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发布时间：2021-03-19
Research Article
- 摘要：The hydrogen-bond defect of water in aqueous solution of a well-defined poly(2-hydroxyethyl acrylate) (PHEA) with different molecular weights and concentrations was studied by Raman spectrum analysis．The pre-designed molecular weight of PHEAs with narrow polydispersities (N value decreased due to the destroying of the hydrogen bond formation between water and the hydrophilic polymer chain in aqueous solutions．
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发布时间：2021-03-19 - 摘要：Methacrylyloxypropyl-modified inorganic／organic hybrid mesoporous materials have been synthesized via an HCl-catalyzed sol-gel process in the presence of citric acid (CA) as a nonsurfactant template,which involves acombination of 3-(trimethoxysilyl)propyl methacrylate (MSMA) and tetraethoxysilane (TEOS) as precursor species．The CA nonsurfactant is removed by extraction with water,resulting in inorganic／organic hybrid mesoporous materials with high surface area (e．g．900 m2·g-1) and large pore volume (e．g．0.55 cm3·g-1)．The surface area,pore volume and pore diameter increase slightly with increasing the content of CA．The products were characterized by XRD,N2 adsorption-desorption and FT-IR．
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发布时间：2021-03-19 - 摘要：Microcellular polystyrene／LCP in situ composites with cell diameter less than 4 μm are prepared by using pressure quenching after supercritical CO2 saturating at 25 MPa,80℃ for 6 h．Characterization of the microcellular structure of these blends is conducted to reveal the influence of LCP addition,LCP ratio and compatibilizer on the microcellular blends．The typical structure of these microcellular PS／LCP blends is that the microvoids only exist in the polystyrene phase．This structure results from the poor adsorption of supercritical CO2 by LCP under the experimental conditions．The cell diameter of the microcellular blends is smaller than that of microcellular PS．An increase of cell size is also found from skin to core in microcellular blends．The microcellular blends with ZnSPS has larger cell size than those without ZnSPS,which is the consequence of the improvement of interfacial adhesion．It is because CO2 could easily diffuse out through the gap between poor adhesion interface of blends without ZnSPS．
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发布时间：2021-03-19 - 摘要：The compatibitily and morphology of HIPS／PC and HIPS-g-GMA／PC blends were studied．The compatibility and morphology of HIPS／PC blends were characterized by DSC and SEM,respectively．The result of DSC shows that Tg of PS doesn’t change with the blend composition,and Tg of PC decreases with the increase in weight fraction of HIPS,which indicates that the PC／HIPS blend is a partially miscible system．Results of SEM indicate that the decrease in Tg of PC results from PS interpenetrating into the phase of PC,and no change in Tg of PS results from PC not interpenetrating into the phase of PS．The copolymer of HIPS-g-GMA was prepared by reactive grafting method．The IR spectrum shows that GMA is grafted on the chain of HIPS．The compatibility and morphology of HIPS-gGMA(35)／PC(65) were studied by DSC and SEM．PC(65)／HIPS-g-GMA(35) blend exhibits reduced size of disperse phase,enhanced interface adhesion and lower Tg of PC phase as compared with the PC(65)／HIPS(35) blend．It implies that HIPS-g-GMA is an effective compatibilizer of the HIPS／PC blend．
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发布时间：2021-03-19 - 摘要：ABA triblock copolymers containing polyisoprene segments,such as polyisoprene-b-polystyrene-b-polyisoprene (PIP-b-PSt-b-PIP) and polyisoprene-b-poly(methyl methacrylate)-b-polyisoprene (PIP-b-PMMA-b-PIP),were prepared with macro-iniferter technique．The mcro-iniferter (PSt-CCDCM and PMMA-CCDCM)bearing α-and ω-N,N-diethyldithiocarbamyl (DC) groups were synthesized by bulk polymerization of St and MMA with diethyl 2,3-dicyano-2,3-di(p-N,N-diethyldithiocarbamylmethyl)-phenylsuccinate (DDDCS) as a thermal iniferter．The block copolymerization of IP with PSt-CCDCM or PMMA-CCDCM was carried out under UV light irradiation．The block copolymers were characterized by 1H-NMR,GPC and DSC analyses,and the polymerization proceeded as a living polymerization process．
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发布时间：2021-03-19 - 摘要：The methyl-ester-terminated G1.5,2.5 and 3.5 poly(amidoamine) dendrimers (PAMAM) are hydrolyzed by using NaOH to obtain external carboxylate groups with them (PAMAMC)．These dendrimers show interaction with cytochrome C in some extent．For example,the reduction rate of FeⅢ-cytochrome C to FeⅡ-cytochrome C by asorbic acid was clearly slowed down because of the interaction between cytochrome C and PAMAM dendrimers．The reaction happened only betweem FeⅢ-eytochrome C and ascorbic acid,it showed a pseudofirst order constant of 3.48 min-1．When PAMAMC (G2.5 or 3.5) dendrimers were added in the reaction system,the pseudo-first order constant dropped to 1.40 or 1.32 min-1．The association constant of l:1 cytochrome C-G2.5C is 2.4×104 and the association constant of l:1 cytochrome C-G3.5C is 2.6×104．
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发布时间：2021-03-19 - 摘要：A hammer-like C60 conjugated polystyrene was synthesized via atom transfer radical polymerization using bromine-ended polystyrene as an initiator．The self-assembly aggregatiIlg behavior of the hammer-like polymer was investigated by DLS,GPC and TEM．Two narrow distributions with hydrodynamic radius 29.5 nm and 1.3 nm were observed in DLS,attributed respectively to the aggregates and single hammer-like polymer molecules．In the eluograph of GPC,two distributions weIe also observed,attributed respectively to the aggregates and single hammer-like polymer．In TEM,micelle particles with average diameter 65 nm were observed,agreed well with the results obtained by DLS．The diameter of aggregates of two hammer-like C60 conjugated polystyrene samples was compared and possible explanations were proposed．
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发布时间：2021-03-19
Research Bulletin
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