• 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 >Determination of the reactivity ratios for acrylonitrile/N-vinylpyrrolidone copolymerization systems
【24h】

Determination of the reactivity ratios for acrylonitrile/N-vinylpyrrolidone copolymerization systems

机译：丙烯腈/ N-乙烯基吡咯烷酮共聚体系的反应率的测定

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

The effects of the copolymerization system on the monomer reactivity ratios for a copolymer of acrylonitrile with N-vinylpyrrolidone was studied for contrast. The values of the monomer reactivity ratios were calculated by the Kelen-Tudos method. The reactivity ratios in the aqueous suspension polymerization system were similar to those in the solution polymerization system at polymerization conversions of less than 6% [reactivity ratio of acrylonitrile (r(AN)) = 0.438 +/- 0.015, reactivity ratio of N-vinylpyrrolidone (r(N-VP)) = 2.28 +/- 0.02]. As conversion of more than 12%, the changes in the monomer reactivity ratios became less prominent (r(AN) = 0.651, r(N-VP) = 1.98). In the water-rich reaction medium [H2O/dimethylsulfoxide (DMSO) > 60/40], the monomer reactivity ratios were approximately equivalent to those in the aqueous suspension polymerization system. In the DMSO-rich reaction medium (DMSO/H2O > 60/40), the reactivity ratios were similar to those in the solution polymerization system. With an increase in the polarity of the solvent, the values of the reaction ratios both decreased. The values of the reaction ratios gradually tended toward I with increasing copolymerization temperature. (C) 2003 Wiley Periodicals, Inc. [References: 11]
机译：为了对比，研究了共聚体系对丙烯腈与N-乙烯基吡咯烷酮的共聚物的单体反应率的影响。通过Kelen-Tudos方法计算单体反应率的值。在小于6％的聚合转化率下，水悬浮聚合体系中的反应率与溶液聚合体系中的反应率相似[丙烯腈（r（AN））的反应率= 0.438 +/- 0.015，N-乙烯基吡咯烷酮的反应率（r（N-VP））= 2.28 +/- 0.02]。当转化率大于12％时，单体反应率的变化变得不太明显（r（AN）＝ 0.651，r（N-VP）＝ 1.98）。在富水反应介质中[H2O /二甲基亚砜（DMSO）> 60/40]，单体反应性比与水悬浮液聚合系统中的反应性比大致相同。在富含DMSO的反应介质（DMSO / H2O> 60/40）中，反应率与溶液聚合系统中的反应率相似。随着溶剂极性的增加，反应比的值均降低。随着共聚温度的升高，反应比的值逐渐趋向于I。 （C）2003 Wiley Periodicals，Inc. [参考：11]

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