• 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 >Highly Active Thermally Stable #beta#-Nucleating Agents for Isotactic Polypropylene
【24h】

Highly Active Thermally Stable #beta#-Nucleating Agents for Isotactic Polypropylene

机译：用于全同立构聚丙烯的高活性热稳定＃β＃成核剂

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

Calcium salts of suberic (Ca-Sub) acids were synthesized and implemented as in different grades of isotactic polypropylene (iPP).Propylene homopolymer,as well as random and block copolymers containing these additives,crystallized iPP into pure or nearly pure #beta# modification in the isothermal and nonisothermal crystallization experiments.Recently,Ca-Sub proved to be the most effective #beta#-nucleating agent of iPP.The Ca-Sub nucleating agent widens the upper crystallization temperature range of pure #beta#-iPP formation up to 140 deg C.In this study the effect of the these additives on the crystallization,melting characteristics,and structure of the PP were studied.The degree of crystallinity of #beta#-iPP was markedly higher than that of #alpha#-iPP.A widening in the melting peak of the samples crystallized in a high temperature range was first observed and discussed in regard to literature results of the same phenomenon for #alpha#-iPP.The morphology of the #beta#-iPP samples was revealed by scanning electron microscopy.Independent of the type of polymer or nucleating agent,hedritic structures were found in the early stages of growth of the #beta#-spherulites.
机译：合成了辛二酸（Ca-Sub）钙盐，并以不同等级的等规聚丙烯（iPP）实施。丙烯均聚物以及含有这些添加剂的无规和嵌段共聚物，将iPP结晶成纯的或接近纯的＃beta＃修饰最近，Ca-Sub被证明是iPP最有效的＃beta＃成核剂。Ca-Sub成核剂扩大了纯＃beta＃-iPP形成的最高结晶温度范围140℃。本研究研究了这些添加剂对PP的结晶，熔融特性和结构的影响。＃beta＃-iPP的结晶度明显高于＃alpha＃-iPP。首先针对与＃alpha＃-iPP相同现象的文献结果观察并讨论了在高温范围内结晶的样品的熔解峰变宽的现象。＃beta＃-iPP样品的形貌为通过扫描电镜观察发现。与聚合物或成核剂的类型无关，在＃beta＃-球晶生长的早期阶段发现了枝晶结构。

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