最新刊期
卷 ， 期 3 ， 1996
- 摘要：he formulae calculating effective crosslinking chain elements, effective elastic chains, pendant chains and their average polymerization degree have been deduced by use of the sol gel distribution theory obtained by authors in reference[7]. The experimental and theoretical results about the relation between the elastic modulus and the density of effective elastic chains of polyurethane containing HTPB are basically identical, but there exists a systematic error.
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发布时间：2021-03-19 - 摘要：The isothermal crystallization of fixtures of poly(MMA-co-BMA) with diffrent composition and cholesteryl nonanoate(ChN have been studied by differential scanning calorimetry(DSC). The Avrtal exponent n and rate constant k for ChN /Poly(MMA-co-BMA) crystallized at different temperatures were examined.It was found that the rate of nucleation and crystallization enthalpy(△HsA-K) of ChN both depend on molecular rigidity of copolymers.
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发布时间：2021-03-19 - 摘要：Chemically blended thermoplastic IPN(CBT-IPN) and mechanically blended thermoplastic IPN(MBT-IPN) were prepared by combining polymer Ⅰ, a linear styrene-butadiene-styrene(SBS) triblock copolymer with polymer Ⅱ, an ionomer prepared from a random copolymer of styrene and methacrylic acid(10: 1,by volume). Their morphology and glass transition behavior were investigated by transmission electron microscopy(TIM) and dynamic mechanical spectroscopy (DMS). The experimentel results showed that compatibility was increased after forming IPN from precursors and that CBT-IPN were more compatible than compositionally equivalent MBT-IPN.All of samples exhibitedd two glass transition temperature and two phases which separated from each other.Analysis of moduli data with the theories of Budiansky and Kerner disclosed dual phase continuity of polymer Ⅱ was decreased with increase of SBS content.
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发布时间：2021-03-19 - 摘要：The synthetic method, technical conditions, structural characteristic and properties of urushiol neodymium chelate polymer which was obtained by reaction of urushiol with needymium chloride, have been studied. Element, IR and MS analysis showed the presence of the group Nd- O of C21H30O2Nd in the polymer. DTA and TG analysis show that the reaction product exhibited good resistance to heat.The result of heat decomposition kinetic experiment shows that it is a first order reaction and the apparent activation energy is 1.356×105J·mol-1,magnetic susceptibility is 8.6058×10-6c.g.s.Urushiol-neodymium polymer may be used as magnetic organometal polymer with good heat resistance property.
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发布时间：2021-03-19 - 摘要：Two dimensional heteronuclear correlated spectroscopy(HETCOR)together with the 13C-NMR spectrum are used to make line assignments of phenolphthalein polyethersulfone(PES-C). These assignments are confirmed by two dimensional homonuclear correlated spectroscopy (COSY). A little modification is made on the original 13C line assignments. Homonuclear and heteronuclear correlated spectroscopy present important information on assigning the spectra lines of PES-C. From the NMR spectra of PES-C the isotacticity of its chain structure is obvious.
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发布时间：2021-03-19 - 摘要：A series of random PEK with cardo group copolymers were synthesized by reaction of mixture of phenolphthalein(PPH) and 3,3' -bis(4-hydroxyphenyl) -isobenzopyrrolidone(HPP) with equivalent molar bis(4-nitrophenyl) ketone(DNBP).The permeabilities of these copolymers to hydrogen, nitrogen and oxygen were observed to vary with HPP molar content in S-form different from other random copolymer systems reported previously. This peculiar phenomenon was explained according to polymer free volume, chain flexibility and strong intermolecular hydrogen-bond interaction.
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发布时间：2021-03-19 - 摘要：The β-D-Glucan, with potential antitumor activity, produced by Sclerotinia sclerotiorun ss-001, was investiqated on its solution behaviours,conformation and conformational change. By studying the effects of ionic strenth and pH value on the intrinsic viscosity, the authors found that the solution behavior is relatively stable. Nevertheless, when the pH value Of the solution surpassed 12.36, the value of intrinsic viscosity would decrease rapidly. By TEM we found this change of solution behavior was due to the conformational variations of the molecules.
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发布时间：2021-03-19 - 摘要：Two series of mainchain liquid crystalline polysiloxane polyurethane elastomers(that is biphenyl type and azoxybenzene type) were synthesized. The structure and properties of these polymers were characterized by FT-IR, DSC, DMA and polarization microscope. Our study concluded that most of these polyurethane samples exhibited nematic thermotropic liquid crystal character. The liquid crystal properties had strong relations with the interaction between the hard and soft segments of the block polyurethane.
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发布时间：2021-03-19 - 摘要：The effect of the content of "W-893" coupling agent and that of particle size, type and content of CaCOe on the impact strengh of HDPE compound were discussed. HDPE compouned filled with 50 PHR CaCOe has the impact strength of 542.35 J /m, which is 3.7 times that of HDPE matrix. An investigation of impact fracture morphology of HDPE compound has ben undertaken by SEM(scanning electron microscope) which showed that impact fracture surface of L-1250 CaCO3 that of both L-325 CaCO3 and W- 1250 CaCO3 filled HDPE compound exhibit flocculence structure.In banded structure,the direction of alligament band is always vertical to that of deformation and yield of HDPE whether it is parallel to the loaded force or not.
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发布时间：2021-03-19 - 摘要：The monomer of vinylcarbazole bonded manganese phthalocyanine (MnPc-VK) was synthesized first by the means of diazo coupling, then photoconductive polymers (Ⅰ). (Ⅱ) and (Ⅲ) containing MnPc were obtained through radical polymerization. The chemical structures of the above monomer and polymers were identified by IR, UV/ Vis, elemental analysis and atomic absorption. Meanwhile, the preliminary studies on their photoconductive mechanism were made through fluorescence analysis.
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发布时间：2021-03-19 - 摘要：Carboxylated polyether polyurethane ionomers based on poly(ethylene glycol)(PEG), 4, 4' -diphenylmethane diisocyanate and 2, 2' -bishydroxymethyl propionic acid were prepared. The ionomers were neutralized with diffirent metal ions.Besides the measurement of DSC and stress-strain curves, the ionic conductivity was calculated on the base of alternating current impedance measurement. The results indicated that the poly (ethylene glycol) polyether polyurethane ionomers containing carboxy groups had both high ionic conductivity and good mechanical property.The effects of different molecular weight of soft segment,weight ratio of hard segment and different sort of metal counter ious on the ionic conductivity were discussed.
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发布时间：2021-03-19 - 摘要：A new kind of liquid crystalline Polyestercarbonates with chain structure-(OPhCO)x-(OPhC(CH3)2 phOCO)y-were synthesized for the first time by using polymer modification method. The liquid crystalline properties were studied by 1H-NMR,FTIR, DSC, TGA, POM and X-ray diffraction. The results showed that Polyestercarbonates with higher inherent viscosities can be obtained by using of PPHB as one kind of raw materials and the polymers exhibit nematic thermotropic liquid crystalline behavior as the content of p-oxybenzoate units increases from 55mol% to 65mol%.PC/60PHB has good thermostability and will not degrade until 380 ℃.
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发布时间：2021-03-19 - 摘要：In order to solve the characterization of interface in polymer blends, a new method that the interface is exposed by solvent dissolving selectively was put forward. By means of X-ray photoelectron spectrometry, we studied the molecular state of compatibilizer in the interfacial area of polyolefin and polar polymer, including -functionalized polymer, graft copolymer and polymer with reactive groups. The experimental results showed that when using as compatibilizers, functionalized polymer adopted favorable conformation to develop completely compatibilization efficiency in the interfacial area the backbone polymer and branch polymer of graft copolymer diffuse into the corresponding miscible polymer bulks;and the reactive groups enriched in the interfacial area before polymer with reactive groups reacting with some polymer bulks.
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发布时间：2021-03-19 - 摘要：In the present work, the compatibility and crystallization of methyl methacrylate-tetrahydrofuran diblock copolymer/tetrahydrofuran homopolymer blends were studied. We found that some special crystalline morphologies could be formed for the compatible blends due to the ealstence of microphase separation of the copolymer, and that the dissolution of the homopolymer in its corresponding copolymer domain could detendned by the DSC thermograms of the blends.
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发布时间：2021-03-19 - 摘要：A series of liquid crystalline copolymers were synthesized for the first time by radical copolymerization of the mesogenic monomer 2, 5-bis-[(4-methoxybenzoyl)oxy] styrene and allyl alconol. The liquid crystalline behavior of the copolymers was studied by DSC, polarized optical microscopy and X-ray,diffraction. It was found that the copolymers formed thermotropic liquid crystal phases in broad temperature ranges. The glass transition temperature and decomposition temperature of the copolymers changed with the increase of the contents of mesogenic monomer units in the copolymers.
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发布时间：2021-03-19
Research Article
- 摘要：It has been recorded that the adduct of C60 with polyallylamine displayed the fluorescence emission at 386 nm and 683 nm with the exciting wavelength at 250 nm and 528nm, respectively, at room tempreture. C60 does not possess the fluorescence emission. Considering polyallylamine is an aliphatic primary amine, it adds easily to C60 via a single electron transfer process. The adduct of C60 with polyallylamine would lose the spherical symmetry of C60 and lead to the exhibition of fluorescence. In order to clarify this, we prepared additive products of C60 with low molecular weight amines including primary and secondary amines such as butylamine,dodecymine,octadecylamine and dibutylamine.The fluotescence enissions are recorded as expected.The concentrational self-queching effect,the flurescence life-time and the flurorescence quenching by TCNQ are also undertaken.
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发布时间：2021-03-19 - 摘要：he intrinsic viscosity [η] of PB was about 1 to 4 and much lower than that of ordinary Nd system. The distributoin of molecular weight was relatively narrow witha dispersity from 2 to 4.5. These were much better characteristics of the system. The content of cis-1, 4 unit of PB was about 98% and it was slightly higher than that of other neodymium systems.
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发布时间：2021-03-19 - 摘要：PVA-STARCH polymer blend is one of methods that make starch-plastics.It hasn't been reported on papers about the rheologic character of starch-plastics blended fluid. We have tested rheologic characteres usig rhemeteres in different temperatures.and shear rates, which were needful in production of starch-plastics and we also discussion then. It has provided useful theoretical base for dribble shaped process of starch-plastics.
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发布时间：2021-03-19 - 摘要：Photo-initiation behavior of N-(4-benzoylphenyl)maleindde (NBPMI),combining with dimethyaminoethyl metharylate (DMAEMA) or its polymer P(DMAEMA) was studied. The photopolymerization rate equations and their overall activation energies were obtained as follows:Rp∝[NBPMI]0.48[DMAEMA]0.18 [MMA]0.82 Ea=26.8 kJ /mol Rp∝[P(NBPMI-DMAEMA)]0.32[MMA]0.92 Ea=21.7 kJ /mol Rp∝[NBPMI]0.38 [P(DMAEMA)]0.65[MMA]0.70 Ea=33.2 kJ /mol The polymeric photoinitiator system shows higher initiation ability than that of the monomericate one. The UV spectrum of P(MMA) initiated by the NBPMI-DMAEMA of MMA,but also enter into P(MMA) polymer chains.
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发布时间：2021-03-19 - 摘要：A method for deriving the kinetic parameters of crystallization was proposed from a DSC heating curve and was applied to investigation on kinetics of nonisothermal crystallization of oriented poly (ethylene terephthalate) fibers. The parameters characterizing the rate and the mechanism of crystallization were obtained.The results indicate the crystallization kinetics of oriented PET fibers can be approximatively described by the first order kinetic model.
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发布时间：2021-03-19 - 摘要：This article investigates the self-reinforcement of general grade polypropylene(PP) in oscillating stress field. The Young's modulus and yield strength of self-reinforced polypropylene have been enhanced sighficantly from original 1.4GPa,31MPa to 3.0GPa, 58MPa in oscillating stress field under low pressure. Its morphology has been investigated by differential scanning calorimetry (DSC) and X-ray diffraction. It has been found that the improvement in mechanical properties of PP should boe ascertained to the production of shishkebab crystals and the orientaion of molecular chains along the flow direction.High working pressure is unnecessary for the self-reinforcement of PP in oscillating stress field.
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发布时间：2021-03-19 - 摘要：A reactive carbon black, which was supported with-OLi groups, was prepared. The anionic graft polymerization of ethylacrylate onto carbon black surface initiated by the supported-OLi groups, dispersion stability of carbon black grafted and ungrafted in methylethylketone and analysis of FT-IR and TEM were investigated.
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发布时间：2021-03-19
Research Bulletin
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