• 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 >Miniemulsion copolymerizations of styrene and reactive alkyl methacrylate costabilizers
【24h】

Miniemulsion copolymerizations of styrene and reactive alkyl methacrylate costabilizers

机译：苯乙烯和反应性甲基丙烯酸烷基酯稳定剂的细乳液共聚合

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

Miniemulsion copolymerizations of styrene (ST) and stearyl methacrylate (SMA) or lauryl methacrylate (LMA) were investigated. Miniemulsions comprising ST and various levels of SMA showed very good storage stability against the diffusional degradation of monomer droplets (Ostwald ripening), whereas miniemulsions comprising ST and various levels of LMA exhibited significant Ostwald ripening. In subsequent miniemulsion copolymerizations of ST and SMA, particle nucleation occurring in the continuous aqueous phase (homogeneous nucleation) plays an important role in the particle formation process in addition to monomer droplet nucleation. The final overall conversion and the individual conversions of ST and SMA all decrease with increasing SMA concentration. Furthermore, at a particular reaction time, the individual conversion of SMA is always greater than that of ST. Monomer droplet nucleation was retarded severely for the monomer pair ST/LMA, presumably due to the very strong Ostwald ripening effect. As a result, relatively slow rates of copolymerization of ST and LMA were attained compared with the ST/SMA counterpart.
机译：研究了苯乙烯（ST）和甲基丙烯酸十八烷基酯（SMA）或甲基丙烯酸月桂酯（LMA）的细乳液共聚。包含ST和各种水平SMA的细乳液显示出非常好的储存稳定性，可抵抗单体液滴的扩散降解（奥斯特瓦尔德熟化），而包含ST和各种水平LMA的细乳液则表现出显着的奥斯瓦尔德熟化。在随后的ST和SMA的细乳液共聚中，在连续水相中发生的颗粒成核（均相成核）除了单体液滴成核外，在颗粒形成过程中也起着重要作用。随着SMA浓度的增加，ST和SMA的最终总转化率和单个转化率均降低。此外，在特定的反应时间，SMA的单个转化率始终大于ST。单体对ST / LMA的单体液滴成核作用严重受阻，可能是由于非常强的奥斯特瓦尔德熟化作用。结果，与ST / SMA对应物相比，获得了相对慢的ST和LMA的共聚速率。

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