最新刊期
卷 ， 期 4 ， 1980
- 摘要：A relatively high molecular weight polyphenyl-as-triazine (PPT) was preparedfrom two monomers--terephthalamidrazone and 1, 4-bis (phenylglyoxaloyl) benzene.ηinh was equal to 1.93 dl/g (0.5% in eresol at 25℃) and T, was 320℃ as determined by differential thermal analysis (DTA).This polymer film exhibited good thermally oxidative stability and it's tensile strength at room temperature was higher than 1000 kg/em2. When the film was treated in boiling water for 200 hours, it retained good insulation (30-35 μ, 1010Ω)and flexibility,and no change was observed in it's IR spectrum. The PPT film showed no loss in weight after being treated for 30 hours at 200℃ in water.
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发布时间：2021-03-19 - 摘要：The precipitate formed form NA capped PMR (polymerization of the monomer react'ants) polyimide solution was isolated and identified. The rate constants of reaction of NA monoethyl ester and 3, 3", 4, 4'-benzophenone tetracarboxylie acid diethyl ester with 4, 4'-diamino diphenyl methane were measured. The stability of resin solution and structure of prepolymer were also discussed.
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发布时间：2021-03-19 - 摘要：I．Emulsion Copolymerization of isobutyl methacrytate (IBMA) with hydrophilie methaerylate esters，such as β-hydroxypropyl methacrylate(HPMA)or β-hydroxyethyl mcthaerylate (HEMA) in the presence of 2％ concentration of polyethylene oxide as nonionic emulsifiers has been investigated．Emulsions with particle size of 0.05—0.07μ have been prepared with good storage stability of more than 10 months without show-ing any coagulation．They were suitable for the preparation of barrier fihning materials of color picture tube in aluminized screens teehniques．The fihns without any ad-ditives show very good back-out properties，and are soluble in the common organic solvents such as ethyl acetate，butyl acetate，etc．II．The thermal stabilities of PHPMA．PHEMA．and various copolymers of IBMA．HPMA and IBMA-HEMA up to 450℃ have been studied by TG-DTA．It iS apparent that both PHPMA and PHEMA are thermal degradiable type polymers．It was shown from the thermal degradation studies of P(IBMA-HEMA) and P(IBMA-HPMA) copolymers that the appropriate content of HEMA or HPMA in the copolymers quali-fled for tile temporary organic barrier films in the aluminized screens techniques should not exceed 20％．
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发布时间：2021-03-19 - 摘要：By means of FI-IR digital absorbancp subtraction technique the melt quenched PET spectrum was subtracted from those of the PET spectra annealed at different temperatures. By removal of the bands associated with gauche conformation, a series of "trans conformation spectra" corresponding to different crystalline states were obtained.After that, the two "trans conformation spectra" annealed at 240℃ and 120℃ respectively are subtracted each other. The "pure crystalline spectra" and "amorphous trans conformation spectra"are thus calculated. From these differenes spectra,some new bands and the changes of bands of the spectra are found. These results can be explained by the changes of chain rotational conformation associated respectively with crystalline and amorphous region in PET.
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发布时间：2021-03-19 - 摘要：The effects of temperature on polymerization rate of propyleno were determined with diethyl aluminum chloride catalyst system in both open and closed operation systems. The order and the rate constant of the reaction were determined. The energy of activation is calculated from the following eguations:
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发布时间：2021-03-19 - 摘要：The properties of Tung's equation are described in this paper.It is proved that the stable solution of Tung's equation is existential if peak spreading function G(x, y) is delta function. A relation between K(G) and h ?△y is constructed by the method of Jacobi rotational transformation, where K(G) is the condition number of Tung's equation for discretization; h the resolution factor and Ay the computational interval.Finally, a method of finding stable solution for Tung's equation is suggested.
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发布时间：2021-03-19 - 摘要：The activation effect of various polyhalophenols on the ring-opening polymeriza-tion of cyclopentene with WCl6-i-Bu3Al catalyst has been investigated．Experimental results showed that 2，4，6，-trichlorophenol，2，3，4，6-tetrachlorophenol and pentachlo-rophenol are highly effective activators in the ring-opening polymerization of eyclo-pentene to trans polypentenamer in petroleum ether．In the absence of the activator or in the presence of the phenol the six solvents have the effects on the catalytic activity in the following order：cklorobenzene> toluene (benzene) > petroleum ether (heptane，cyclohexane)．The coeatalytic activity of three diethylaluminium halides is in the following order：Et2AlI>Et2AlCl> Et2AlBr．The trails-vinylene content of polypentenamer is not affected by the nature of polyhalophenols，solvents and alu-minium alkyls，and the polymerization conditions．
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发布时间：2021-03-19 - 摘要：A computer program was developed to resolve the overlapping X-ray diffraction peaks by Davidon's Minization Method. A new expression called 'Extended Cauchy Function' has been proposed to express the scattering curves of non-crystalline polymers. More reasonable results were obtained than those calculated by Hindeleh's polynomial function.
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发布时间：2021-03-19 - 摘要：The relative viscosities of zinc di-n-butylphosphinate polymer in chloroform solution have been measured. It has been found that the relative viscosities of this polymer decrease with increasing water content in the system and vice versa. The equilibrium can be established rapidly at room temperature. The suggestion that there were water sensitive bonds in the polymer chain is not well found.
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发布时间：2021-03-19 - 摘要：Two new active esters of acrylic acids monomers, N-p-acryloxybenzoyloxy succini-mide (ABOSu) and N-p-methacryloxybenzoyloxy succinimide (MBOSu) have been synthesized and polymerized.ABOSu and MBOSu were prepared by coupling of p-acryloxybenzoic acid (ABA) or p-methacryloxybenzoie acid (MBA) with N-hydroxy succinimide in the presence of dicyclohexylcarbodimide.High molecular weight poly (ABOSu) and poly (MBOSu) were obtained by radical polymerization of the corresponding monomers.The reactive poly (MBOSu-MBA) copolymer was used to immobilize the serum protion. This immobilized protein was a hopeful bioactive solid immunoadsorbent.
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发布时间：2021-03-19
Research Article
- 摘要：A model of gelation of polyurethanes is developed through an analysis of the reaction of polyurethanes. According to the critical condition of gelation, the recurrence coefficient of centeral functional group must be unity. A mathematical expression of the cure system of polyurethane has been derived on this basis and the reduced form of the model obtained agreed well with that published in the literature.
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发布时间：2021-03-19 - 摘要：As it is shown by the relationship between the concentration of propagating species and the reaction time, the polymerization of tetrahydrofuran initiated by allyl bromide-silver perchlorate system at temperatures above 0℃ cannot be regarded strictly as a living one, but at - 9℃ the termination reaction is completely avoided.
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发布时间：2021-03-19 - 摘要：Copolymer beads prepared from styrene and divinylbellzene were chloromethylated by a mixture of sulphuryl chloride-methylal．The chlorine contents of the ehlorome-thylated copolymer beads tire found to be 16—17％ while the exchange capacities of the strong basic type anion．exchange resin obtained thereof arc within the range of 3.3-3.5 meq／g (dry resin)．The effects of the molar ratio of the raw materials，the amount of zinc chloride catalyst．and the contents of methanol and water in methylal on the ehlorine contents of the ehloromethylated eopolymer beads and exchange capacities of the synthetic strong basic type anion-exchange resin were investigated．In contrast with the traditional chloro methyl methyl ether method better results were obtained by using lower molar ratio of the raw materials and less amount of the catalyst．Methanol and water contents of methylal if present within certain limits have little or no effect on the chlorine content of the beads and exchange capacity of the resin．
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发布时间：2021-03-19
Research Bulletin
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