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长链支化聚丙烯和线性聚丙烯熔体结晶动力学的对比研究
  • ISSN号：0023-074X
  • 期刊名称：《科学通报》
  • 时间：0
  • 分类：TQ325.14[化学工程—合成树脂塑料工业]
  • 作者机构：[1]中国科学院化学研究所,北京分子科学国家实验室,高分子材料科学联合实验室,北京100080, [2]中国科学院化学研究所,高分子物理与化学国家重点实验室,中国科学院丁程塑料重点实验室,北京100080, [3]河南科技大学化学工程和制药学院,高分子科学与纳米技术重点实验室,洛阳471003
  • 相关基金：国家杰出青年科学基金（批准号：50521302）和国家自然科学基金（批准号：20574079和20423003）资助项目
作者： 曾伟[1], 刘继纯[3], 周俊峰[2], 董金勇[2], 闫寿科[1]
关键词： 长链支化聚丙烯, 线性聚丙烯, 结晶动力学
中文摘要：

通过光学显微镜（OM）和差示扫描量热仪（DSC）对长链支化聚丙烯（LCBPP）和线性等规聚丙烯（Linear-iPP）的等温及非等温结晶动力学作了详细的研究．OM结果显示：在等温结晶过程中，由于LCBPP中长支链的存在阻碍了链段的扩散，导致其晶体生长速度比Linear-iPP的慢．然而，DSC结果显示：在等温结晶过程中，LCBPP的结晶总速度比Linear-iPP的要快得多．这是因为对于两种PP来说，等温结晶过程都是一个成核控制的过程，LCBPP较快的成核速度导致了它的结晶总速度较快．Avrami分析指出，LCBPP和Linear-iPP具有相近的成核和生长机制．而在非等温结晶过程中，随着降温速度的加快，两种PP的结晶速度均加快，但是在任何一个对应的降温速度，Linear-iPP的结晶速度都要快于LCBPP．这意味着对两种PP来说，非等温结晶过程是一个生长控制的过程，LCBPP较慢的链段扩散速度导致了其较慢的结晶总速度．

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期刊信息
  • 《科学通报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国科学院
  • 主编：周光召
  • 地址：北京东黄城根北街16号
  • 邮编：100717
  • 邮箱：csb@scichina.org
  • 电话：010-64036120 64012686
  • 国际标准刊号：ISSN：0023-074X
  • 国内统一刊号：ISSN：11-1784/N
  • 邮发代号:80-213
  • 获奖情况:
  • 首届国家期刊奖,中国期刊方阵“双高”期刊,第三届中国出版政府奖
  • 国内外数据库收录:
  • 美国化学文摘（网络版）,美国数学评论（网络版）,美国工程索引,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊（2004版）,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）,中国北大核心期刊（2014版）,中国北大核心期刊（2000版）
  • 被引量:81792