最新刊期
卷 ， 期 6 ， 1984
- 摘要：Various factors which influence the reaction rate of radiation induced emulsion polymerization of vinyl acetate and number of latex particles, molecular weight, molecular weight distribution and degree of branching of the polymer has been studied. The polymerization curves and the curves of Mn-X,Bn-X,Mn/Mw-X were calculated theoretically on the basis of Frii's model found for chemically induced emulsion polymerization of vinyl acetate; and different expressions for K'd,Ktr-p and Ktr-m from those obtained by Friis were used. The theoretical curves agree well with those obtained from our experments.
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发布时间：2021-03-19 - 摘要：Poly(styrene-sulfone) has been sythesized and evaluated as a positive deep UV resist for high resolution lithography. The resolution is 0.75 μm. The sensitivity is approximately 6.5 fold higher than PMMA. In this work we have found that the sensitivity depends greatly on the molecular weight and film thickness. The bigger the molecular weight, the higher the sensitivity. The thiner the thickness, the higher the sensitivity. Hydroperoxide and earbonyl group were observed during irradiation by the measurement of IR and VU spectroscopy.
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发布时间：2021-03-19 - 摘要：The photo-oxidation reaction of poly (styrene-sulfone)-a novel positive deep UV photoresist including film and solution has been studied by fluorescence spectra.The fluorescence intensity of poly (styrene-sulfone) decreased gradually with the duration of exposure. This phenomena was also observed when a trace amount of aromatic hydrogen peroxide or carbonyl compounds introduced to poly (styrene-sulfone) which was without irradiation. It indicated that the quenching of the fluorescence of poly (styrene-sulfone) after irradiation was related with the formation of hydrogen peroxide or carbonyl group during the process of photooxidation. This method,evidently,can be used for studying the starting period of the photo-oxidation of polymers. The mechanism of photooxidation of poly(styrene-sulfone) has been discussed on the basis of this results.
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发布时间：2021-03-19 - 摘要：The copolymerization of ethylene and 1,3-butadiene with rare earth catalysts was investigated. It was found that ethylene and 1, 3-butadiene were copolymerized to give high molecular weight products. Solvents extraction of crude copolymer indicated that there was no polyethylene but about 8% polybutadiene was present. The products obtained have been confirmed to be copolymers containing long ethylene-ethylene sequence by DSC, X-ray diffraction and electron microscope. Butadiene unit in the copolymer was almost exclusively in cis-1,4 structure. X-ray crystallinity was of polyethylene type with a slight variation of the structure parameters. Melting temperature, crystallinity and crystallite size increased with increasing ethylene unit content.
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发布时间：2021-03-19 - 摘要：The Polymerization of hexafluoropropylene was studied by means of an apparatus with capacively coupling of external electrode. We have obtained better condition of polymerization and proved the effect of the obvious etching in the polymerization system with increasing discharge power. This effect was controlled by hydrogen as plasma gas. The results of X-ray diffraction and elemental analysis show that the polymer is of cross-linked structure. We have determined the contact angle and refractive index of the plasma-polymerization film of hexafluoropropylene. The obtained film exhibits good optical properties hydrophobic properties and themostability.
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发布时间：2021-03-19 - 摘要：1,3-Bis (trichlorosilyl) cyclohexance was obtained by addition HSiCl3 to cyclohexa-diene-1,3 in the presence of H2PtCl6·6H2O in isopropyl alcohol. The new compound was ethanolysed and methylated to form di-methyl tetra-ethoxy disilyl, tri-methyl tri-etKoxy disilyl and tetra-methyl di-ethoxy disilyl cyclohexanes.The di- to tetra-functional monomers were hydrolysed by hydrochloric acid in ether. The di-functional monomers yielded cyclic dimer similar to octamethylcyclotetrasiloxane, and the tri-functional monomer,a cyclic tetramer,while in thecase of tetra-functional monomer,a cyclic octamer was obtained.All these compounds have not been reported in literature.
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发布时间：2021-03-19 - 摘要：A computational multipeak resolution method for X-ray diffraction has been applied to the powder of solid state cured polyphenylene sulfide (PPS). It was found that the crystallinity of PPS powder decreased during the solid state curing, while its adverage crystallite volume and area of the basic planes of the crystallites increased. The chemical and physical processes in solid state curing of PPS were discussed in comparison with the results of thermal analysis.
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发布时间：2021-03-19 - 摘要：A high molecular weight aromatic polyether-ketone has been prepared by polycon-densation of diphenyl ether with m-phthalyl chloride under conventional coditions. Ethy-lene dichloride was chosen as the media and aluminum chloride as the catalyst in the polycondensation. It was found that the remainder of aluminium chloride in the product was conveniently removed by treating the reaction mixture with nitrobenzene. Analysis of infrared spectra indicates that not only para-but also orthopositions of the benzene rings of the aromatic ether take part in the polycondensation. The chief pro-perties of the polyether-ketone are listed.
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发布时间：2021-03-19
Research Article
- 摘要：In the presence of manganous salts, the polymerization kinetics of acrylamide initiated by potassium persulfate has been studied dilatometrically and the rate equation of the polymerization can be expressed as follows: RP=9.92×108 exp {- 13,700/RT} [Mn2+]0 [M][KPS]1/2,where [Mn2+],[M] and[KPS] were the concentration of manganous salts, monomer acrylamide and initiator potassium persulfate respectively. The experimental results have showed that only the induction of polymerization was affected by manganous salts while the polymerization rate as well as polymer molecular weight was not affected to detectable degre. The mechanism of polymerization has been studied.
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发布时间：2021-03-19 - 摘要：The oligomers containing 1,2-bis (3,5-dioxopyridazine-1) ethane (ICRF-154) and (±)-1,2-bis (3,5-dioxopyridazine-1) propane (ICBF-159) were prepared by reaction of 1,2-bis (3,5-dioxopyridazine-1) ethane or (±)-1,2-bis (3,5-dioxopyridazine-1) propane with various α, ω-dibromoalkanes in the presence of anhydrous potassium carbonate. The structural characteristics of the oligomers were investigated by IR and 1H-NMR. respecticvely.
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发布时间：2021-03-19 - 摘要：The graft of PDS onto polypropylene was studied by IE, ESR, and gel formation during light irradiation (500W high pressire mercury lamp) The results show that either in air or in argon PDS can effectly graft onto the polypropylene. The possible mechnizm of graft is by way of PDS-NO. stable free radical.
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发布时间：2021-03-19 - 摘要：By the direct radiation grafting technique, effects of hydrochloric acid on radiation induced graft copolymerization have been studied. The experimental results show that the presence of hydrochloric acid markedly enhanced the grafted amount of acrylic acid to polytetrafluoroethyene. From the cross section and surface of the grafted film and its thickness change, it is found that grafting takes place on the surface of poly-tetrofluoroethyene by the presence of hydrochloric acid. The reasons is that the presence of hydrochloric acid will promote existing hydrogen abstraction reactions from the grafted chains to give more grafting sites. The outer-most layer is the homopoly-mer of polyacrylic acid,which is linked by chemical bond with the grafted copolymer, hence its adhesiveness to epoxy resin becomes greater.
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发布时间：2021-03-19 - 摘要：The results of the WAXD analysis of cis polybIutadiene containing brans-1，4 units，synthesized with dual catalyst (vanadium-and cobalt-based) systems，and cis-polybuta-diene containing syndio-1，2 units，synthesized with two cobalt catalyst systems，were presented in this paper．The erystallinity of both cis-polybutadierie was proved to be contributed by the pre-sence of trans-1，4 polybutadiene sequences and syndio-1，2 polybutadiene sequences respe-ctvely in the cis-polybutadiene. The degree of erystallJnity of polymer is increased with the increase of trans-1，4 content in the cis-polybutadiene cont containing trans-1，4 units and with that of syndio-1，2 content in the cis-polybutadiene containing syndio-1，2 units．From,the relationship between the degree of crystallinity of the polymer and trans-1，4 content or syndio-1，2 content，it was shown that the degree of crystallinty of blend of homopolymers was hi-gher than that of copolymers．The blends held the transition feature of crystal modifi-cation and not so for copolymers at 50℃．
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发布时间：2021-03-19 - 摘要：Photostabilization effect of two metallo-containg compounds have been studied in this note.Both cobalt and nickel containing stabilizers can quench the fluorescence of ter-phenyl and anthracene in suitable wave-length. But in another excited wave-length of aromatic compound, where the absorption intensity of stabilizer can be negligible, the quenching effect of stabilizers disappear. These results indicate that, the fluorescence quenching occured is owing to the absorption competition between aromatic compound and metallo-containg stabilizers.
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发布时间：2021-03-19 - 摘要：A Series of PGC was obtained by esterification of poly-(glycidyl methacrylate) (PGMA) with einnamic acid. NMR was used to determine the degree of esterification. The content of cross-linking under irradiation was quantitatively measured by UV, and confirmed by the gel-content test. It is foumd that the introduction of einnamic acid greatly increases the sensitivity to the dfarp UV. Thus, PGC is a highly enough sensitive negative resist without adding any sensitizer.
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发布时间：2021-03-19
Research Bulletin
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