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The bulk polymerization of methyl methacrylate which was carried out in a metallic dilatometer and in a differential scanning calorimeter has been studied over the complete course of the reaction. An attempt was made to quantitatively express the relation on the onset of gel effect and the final conversion with polymerization conditions such as temperature, kinds and concentration of initiators. It was demonstrated further that the final conversion of polymerization in homogeneous ideal systems is only dependent upon the reaction temperature. 相似文献
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The seeded semicontinuous emulsion multi-copolymerization of butyl acrylate (BA),2-ethylhexyl acrylate (2EHA), methyl methacrylate (MMA), 2-hydroxyl propyl acrylate(HOPA) and acrylic acid (AA) was used to prepare the acrylic latexes with high-solidcontent. The effects of monomer emulsion feed rates (R_a) and (R/E)_E values, the ratio ofemulsifier amount between the initial charge (R) and the addition monomer emulsion (E),on the polymerization reaction features, the viscosities, surface tensions,particle sizes andparticle sizes distributions of latexes,T_g and the insoluble fractions of films, the 180° peelstrength, tack and holding power of pressure-sensitive adhesive (PSA) tapes, preparedfrom the latexes, were studied. Experimental study shows that the grafting and cross-linking fraction in the PSA tapes must be controlled within a suitable range to keep thebalance of the 180° peel strength, tack and holding power. 相似文献
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ABS树脂合成路线,结构,性能和新品种 总被引:3,自引:0,他引:3
本文根据50篇参考文献和专利,对ABS树脂(丙烯腈-丁二烯-苯乙烯三元共聚物)的合成路线、结构性能和新品种作了综述.在简介了橡胶增韧聚苯乙烯系列,特别是ABS以后,首先描述了乳液、本体-悬浮、连续本体3种制备ABS的聚合方法,并作了评价.然后讨论了3组份的比例、橡胶颗粒大小、接枝率等对ABS树脂抗冲、耐热、流动、透明、耐候等性能的影响.最后介绍高抗冲型、透明、耐热、阻燃、电镀型等ABS新品种和其合金,以及有关生产关键和应用领域. 相似文献
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