• 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 >Conversion studies in a novel reaction injection molding process for syndiotactic polystyrene
【24h】

Conversion studies in a novel reaction injection molding process for syndiotactic polystyrene

机译：间规聚苯乙烯的新型反应注射成型工艺中的转化研究

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

Syndiotactic polystyrene (sPS) has successfully been produced using a novel reaction injection molding (RIM) process and a metallocene catalyst. Previous studies have shown that many of the requirements for a RIM process are achievable. However, problems due to incomplete conversion of monomer have hindered the commercial development of this process. In attempts to overcome this conversion limitation and gain insight into its nature, the effects of the extent of mixing, reaction time, and mold wall temperature were investigated on the monomer conversion and polymer properties. The properties of interest included the sPS fraction, molecular weight, melting point, and stereoregularity of the polymer produced. It was found that this RIM process was not mixing limited. Longer reaction times resulted in an increase in conversion, with no significant change in the polymer properties. Mold wall temperature had the greatest effect on both the conversion and polymer properties. Lower mold wall temperatures resulted in an increase in the conversion. At both of the temperature extremes studied, the polymer properties deteriorated. Infrared spectroscopic analyses of the as-polymerized samples indicated that sPS helical conformations were present. This suggested that the styrene monomer may be entrapped within the helical crystalline structures of sPS, preventing complete monomer conversion during this sPS RIM process. (C) 1998 John Wiley & Sons, Inc. [References: 29]
机译：使用新型反应注射成型（RIM）工艺和茂金属催化剂已成功生产间同立构聚苯乙烯（sPS）。先前的研究表明，RIM过程的许多要求都是可以实现的。但是，由于单体转化不完全引起的问题阻碍了该方法的商业开发。为了克服这种转化限制并深入了解其性质，研究了混合程度，反应时间和模具壁温对单体转化率和聚合物性能的影响。感兴趣的性质包括所生产的聚合物的sPS分数，分子量，熔点和立构规整度。发现该RIM过程不受混合的限制。较长的反应时间导致转化率增加，而聚合物性能没有明显变化。模具壁温对转化率和聚合物性能都有最大的影响。较低的模具壁温度导致转化率增加。在所研究的两个极端温度下，聚合物性能均下降。聚合后的样品的红外光谱分析表明存在sPS螺旋构象。这表明苯乙烯单体可能被困在sPS的螺旋晶体结构中，从而阻止了在sPS RIM过程中单体的完全转化。 （C）1998 John Wiley＆Sons，Inc. [参考：29]

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