最新刊期
卷 ， 期 2 ， 1989
- 摘要：The soluble properties of Polytributyltinmethacrylate (PTBTM) and Polytrimethyltinme-thacrylate (PTMTM) in about sixty solvents have been examined. The intrinsic viscosity method was used for determining the three dimensional solubility parameters of PTBTM and PTMTM. The results are listed bellow:PTBTM: =8.65(Cal/cm3)1/2, d=8.65, p=0, h = 0 PTMTM:The relationships between the solubility parameters and the structure of polyorganotinmetha-crylates were discussed.
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发布时间：2021-03-19 - 摘要：The kinetics and mechanism of copolymerization of alphamethylstyrene and butadiene, initiated by n-BuLi in cyclohexane with THF as polar additive, were in detail investigated. A series of reaction rate constants of various species such as monomeric species, monoetherated species and dietherated species for the propagation and depropagation were calculated from experimental results. The complex equilibrium constants between various species were obtained, too.
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发布时间：2021-03-19 - 摘要：The rheological properties of the concentrated solution of sulfonated polysulfone with different ion exchange contant (1EC) in DMF, 3D/T, DMF + 0.07 N NaNO3 and 3D/T+ 0.07 N NaNO3 have been determined by using NXS-11 model rotary viscometer under various temperature. Influence of polyelectrolyte effect on experimental results were discussed.
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发布时间：2021-03-19 - 摘要：Six kinds of macroporous crosslinked polystyrene beads bearing ethylene glycol, poly-ethyleneglycol and their monoethers have been prepared. These resins are made from chloromethylated polystyrene beads, the glycols and their monoethers. In the optimum conditions, the percentages of conversion of chlorine atom into the ether groups are between 93.4-97.5%. These resins can adsorb gold ion Au(Ⅲ) selectively from aqueous hydrochloric acid solution in the presence of Pd(Ⅱ), Cu2+,Ni2+,Cd2+ ions. The adsorption capacities of these resins are between 226.3-93.8mg Au(III)/g resin. The adsorbed gold ion can be eluted to 95.8% by 3% thiourea-1 N hydrochloric acid solution used as an eluent.
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发布时间：2021-03-19 - 摘要：Polymerization of butadiene catalyzed by the fitle catalyst have been investigated. It was found that by adding halides to a tricomponent catalyst, the catalytic activity and the stability of active species of the system will be increased and the molecular weight of the polymer can be regulated. The feeding order of the catalyst components has significant influence on the catalytic activity, UV-Vis spectra of the catalyst indicated that the absorption band at 510 nm is the characteristic band of active species of the catalyst. A possible me-chanism for the interaction between components of the catalyst was suggested.
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发布时间：2021-03-19 - 摘要：The equilibria of VC between vapor phace and PVC, EVA or EVA-g-VC phase were studied at 60℃ in water slurries. The experimental data were treated with three mathematical models: Flory-Huggins' classical model, Prigogine-Flory's free-volume model, and the author's linear model. The calculated values of the solubility of VC in the polymers agreed well with the experimental results. Moreover, it was shown that the free-volume model is applicable to VC/PVC system, the linear model has the advantage of adequate accuracy and simp-licity in use,and the solubility of VC in EVA-g-VC follows the rule of additivity.
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发布时间：2021-03-19 - 摘要：A systematical research of the effect of molecular weight of epoxy pre-polymer, stoichio-metry and cure condition on the distributuin of relaxation time of dynamic loss tan o in Tg relaxation region of epoxy network has been reported in the present paper. Our results first proved that the Tg relaxation of epoxy network is characteristic of standard linear solid with a single relaxation time which is independent of the molecular weight, stoichiometry and cure condition. The present results can be interpreted by using inhomogeneous structure feature in the epoxy network.
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发布时间：2021-03-19 - 摘要：Macroporous poly-vinylpyridine resins with quaternary ammonium group were synthesized and the relationship between the ratio of crosslinking and diluent used was studied. Experimental results showed that resins with high specific surface area could be obtained with 10% crosslinking agent and 200% diuent. Removal of bilirubin by the above resin was 91%. The blood compatible properties were not satisfactory and 50% leukocytes and erythocytes remained after 2 hrs. of circulation.
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发布时间：2021-03-19 - 摘要：The variance of the instrumental spreading function, i.e. the spreading factor of mono-dispersed polymer in a SEC column was determined experimentally with narrow MWD polystyrene standard samples by the method of simultaneous calibration. The dependence of the spreading factor on the retention volume deduced from a simple theoretical approach may be expressed by a formula with four physically meaningful and experimentally determinable parameters. The formula fits the experimental data quite well and the conditions for the appearance of maximum spreading factor are explicable.
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发布时间：2021-03-19 - 摘要：The apparent molecular weight Mw of Na-salts of polyelectrolytesulfonated polysulfone has been determined by small angle laser light scattering in DMF solution which contained NaNO3, LiNO3, LiCl, NaBr and NaI respectively. The results show that the apparent molecular weight of samples in DMF solution contained 0.07 N NaNO3 approach to the true molecular weight Mw.
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发布时间：2021-03-19 - 摘要：The effect of acid concentration on the aniline polymerization and on the structure and properties of polymers obtained have been investigated using FTIR, XPS and elemental analysis. The conductivity and structure of the polymers depend on the acid concentration of the polymerization solution. In medium concn. of 0.5-4 M, polymer having high conductivity and mainly 1,4-substituted benzen ring structure is obtained with high yield. In low concn. (0.001-0.4 M), the contents of azo-group and 1,3-substituted benzen ring increase with decreasing acidity. When HCl conen. is higher than 5M, the conductivity and the content of quinoid-units decrease and 1,4-addition of HCl to the quinoid-units is observed.
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发布时间：2021-03-19 - 摘要：This paper deals with the synthesis of mesogenic condensation monomer, 2-methyl-1, 4-phenylene bis(4-chloroformyl) benzoate. The liquid crystalline non-liquid-crystalline sequential block copolymers made from this mesogenic monomer and 1,10-decanediol and poly (propylene glycol) are also discussed. In the DSC thermograms of the samples with higher inherent viscosity, a marked exothermic peak is found to exist after the melting of the samples. This unusual phenomenon may have suggested an additional organization of the mole-cules in the liquid crystalline state.
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发布时间：2021-03-19 - 摘要：Non-affine deformation and the slippage function are discussed. The slippage function is determined for some polymer solutions with moderate concentration by means of the Cox-Merz rule. The non-linear viscoelasticity of these solutions is described with the aid of the Rouse-Zimm model with slippage function. The theoretical predictions show good agreement with published experimental data.
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发布时间：2021-03-19 - 摘要：Copolymer is prepared by the suspension copolymerization of triallyl cyanurate (TAC) and methyl acrylate (MA) in the presence of diluents such as cyclohexane, n-butyl ether, or toluene-gasoline (200#). The pore-structure parameters of the copolymer beads were determined. The study of pore structure shows that average pore radius is 10000-80000 A. The effects of molecular structure and amounts of the diluents on the pore structure of the beads were studied. The mechanism of forming super-macropore was disscued preliminarily.
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发布时间：2021-03-19 - 摘要：The catalytic activity of Ni-Al(i-Bu), OR-B and Ni-Al(i-Bu)2 OAr-B system (-OR is -OC8H17, -OC9H19 and -OAr is -O-Ph-CH3, -O-Ph-C8H17) for the polymerization of butadiene in hydrogenated dasoline, the modecular weight of the polymer, and the micros tructure of the polymer have been studied. The result showed that the catalytic activity of the new nickel catalpst system for the polymerization of butadiene is very high when the co-cata-lyst is Al(i-Bu)2OR or Al(i-Bu)2OAr, and that the content of Cis-1,4 unit in polymer pre-pared is about 96%. Based on the mapnetic susceptibility measurement and OW-VIS spectum of the new nickel catalst systems,it could be seen that the Ni(I) existe mainly in the Al(i-Bu)2OR system,and te Ni(I)and Ni(O) coexisted in the Al(i-Bu)2 OAr system.
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发布时间：2021-03-19 - 摘要：The dynamic mechanical properties and morphology of binary copolymer networks (BCN's) of vinyl-terminated polyurethane (VTPU) prepolymer and vinyl monomers such as styrene(St), methyl methacrylate(MMA), vinyl acetate(VAc) and butyl methacrylate(BMA) were studied. All the BCN's samples have semicompatible feature on the dynamic mechanical spectroscopy. The compatibility between components increases with the increasing cross-link density due to the increase in the entropy of mixing. The amount of soluble species varies with composition of BCN's. The sol fraction can improve the compatibility between com-ponents.
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发布时间：2021-03-19 - 摘要：In this paper, the effects of hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN) on the toughness of epoxy resin were investigated. Only by adding 10 to 20 phr of HTBN, the properties of epoxy resin would be modified greatly, e.g., lap shear strength, impact strength, tensile strength, elongation and glass transition temperature are 30 MPa, 9 ×10-2 J/ cm2, 61 MPa, 10% and 115℃, respectively, compared with 24 MPa, 3.4×10-1 J/cm2, 30 MPa, 5% and 124℃, respectively for a resin without HTBN. Two-phase structure of tonghened epoxy resin was observed by studies of DSC and scanning electron microscopy.
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发布时间：2021-03-19 - 摘要：Carboxy end-capped polybutadine and butadine-acrylonitrile copolymer were transformed into dicationically living poly (THF-b-butadine-b-THF) and poly (THF-butadine-avryloni-trile-b-THF) triblock chains, respectively, through the ring-opening polymerization of THF. By terminating the reaction with liquid ammonia or diethylamine the telechelic triblock with primary or tertiarr amine end-groups, respectively, was synthesized. The tertiary amine terminated triblock oligomer reacted with a,a'-dic,hloro-p-xylene gives rise to the formation of thermo-plastic elastomer ionene polymer.
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发布时间：2021-03-19 - 摘要：In this paper, effect of Lewis bases on the configuration of isotactic and atactic polypropylene, the tacticity of triad and pentad as well as the number average sequence length have been studied by 13C-NMR spectra. The effect of Lewis bases on raising the stereospecifi-city of polypropylene structure for Lib, Lo, Li, Ln, has been obtained, the isotacticity measured using extraction with boiling-heptane has been explained from the configuration of polypropylene.
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发布时间：2021-03-19
Research Article
- 摘要：Bromo-poly-4-methyl-pentene-l(BPMP) was prepared through macromolecular reaction of PMP with bromine. Thus, bromine contents, surface morphologies and gas permeation properties of BPMP membranes were measured with elementary analysis, transmission electronic microscopy and gas permeation rate measurement apparatus. Compared with PMP, BPMP has good solubilities in organic solvents. The morphologies of the casting BPMP membranes were different from each other, and the gas permselectivities were also different.DSC analysis show-ed the less crystallinity of BPMP than that of PMP.
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发布时间：2021-03-19 - 摘要：The bulk polymerization of styrene initiated by AIBN which was sensitized by PVN could, be effected by magnetic field under irradiation with 320 nm monochromic light. The molecular weight distribution of polystyrene is dependent on the concentration and molecular weight of PVN. It was confirmed by experiments that the critical molecular weight and concentration of PVN which effected on the polymerization are 1.7×103 and 1.62×10-3 mol/l respectively. The cause which is responsible for these phenomena was discussed qualitatively.
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发布时间：2021-03-19 - 摘要：A poly (amido-amine) was synthesized by reaction of piperazine with methylene-bis-acry-lamide in aqueous solution. Factors influencing degree of polymerization are discussed. The poly (amido-amine) so obtained is tough, milky solid with high crystallinity. It is soluble in water, formic acid, acetic acid and phenol, but insoluble in alcohols, acetone, chloroform, ethylene dichloride and even dimethylformamide, dimethylsulfoxide. By refluxing in methanol, it reacts with butyl bromide and partially quaternized.
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发布时间：2021-03-19 - 摘要：GRIN rods of DAP-MMA copolymer with long diameter and high difference of refractive index have been prepared by diffusion copolymerization. Conditions of copolymerization are studied. The reason that cracks are brought about is given. The optimum condition in the fabrication of the rods has been found.
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发布时间：2021-03-19
Research Bulletin
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