• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Several features of vinyl chloride-diallyl phthalate suspension copolymerization
【24h】

Several features of vinyl chloride-diallyl phthalate suspension copolymerization

机译：氯乙烯-邻苯二甲酸二烯丙酯悬浮共聚的几个特征

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Vinyl chloride-diallyl phthalate (VC-DAP) suspension copolymerization was carried out in a 5-L autoclave and 200-mL stainless steel vessel at 45 degrees C. The apparent reactivity ratios of VC-DAP suspension copolymerization system were calculated as r(VC) = 0.77 and r(DAP) = 0.37. It shows that VC-DAP copolymer contains no gel when the feed concentration of DAP (f(2)(0)) is lower than a critical concentration (f(cr), inside the range of 0.466-0.493 mmol/mol VC at 80-85% conversion), the polymerization degree (DP) of copolymer increases with the increase of f(2)(0) and conversion. VC-DAP copolymer is composed of gel and sol fractions when f(2)(0) is larger than f(cr). The DP of sol fraction decreases as f(2)(0) increases, but the gel content and the crosslinking density of gel increase. The gel content also increases as conversion increases. The results also show that the index of polydispersity of molecular weight of sol changes with f(2)(0), a maximum value appears when f(2)(0) is close to f(cr). (C) 2000 John Wiley & Sons, Inc. [References: 18]
机译：氯乙烯-邻苯二甲酸二烯丙酯（VC-DAP）悬浮共聚反应是在45摄氏度下于5升高压釜和200 mL不锈钢容器中进行的。VC-DAP悬浮共聚体系的表观反应率计算为r（VC ）= 0.77，而r（DAP）= 0.37。结果表明，当DAP的进料浓度（f（2）（0））低于临界浓度（f（cr），在80时0.​​466-0.493 mmol / mol VC范围内时，VC-DAP共聚物不包含凝胶。 -85％的转化率），共聚物的聚合度（DP）随着f（2）（0）和转化率的增加而增加。当f（2）（0）大于f（cr）时，VC-DAP共聚物由凝胶和溶胶部分组成。溶胶分数的DP随f（2）（0）的增加而降低，但凝胶含量和凝胶的交联密度增加。凝胶含量也随着转化率的增加而增加。结果还表明，溶胶的分子量的多分散性指数随f（2）（0）而变化，当f（2）（0）接近f（cr）时出现最大值。 （C）2000 John Wiley＆Sons，Inc. [参考：18]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号