中国塑料 ›› 2016, Vol. 30 ›› Issue (04): 50-54 .DOI: 10.19491/j.issn.1001-9278.2016.04.009

• 材料与性能 • 上一篇    下一篇

乙烯含量对无规共聚聚丙烯晶型及性能影响的研究

王艳芳1,张凤波1,陈商涛1,姜凯1,黄强1,吴林美1,黄伟欢1,王刚2   

  1. 1. 中国石油天然气股份有限公司石油化工研究院2. 中国石油大连石化分公司有机合成厂
  • 收稿日期:2015-12-14 修回日期:2015-12-25 出版日期:2016-04-26 发布日期:2016-04-26

Influence of Ethylene Composition on Crystal Types and Properties of β-Nucleated Propylene/Ethylene Random Copolymer

  • Received:2015-12-14 Revised:2015-12-25 Online:2016-04-26 Published:2016-04-26

摘要: 通过差示扫描量热分析、X射线衍射分析以及力学性能测试等方法,研究了不同乙烯含量的无规共聚聚丙烯(PPR)体系中,在添加定量β成核剂的条件下,乙烯含量对PPR结晶行为及热学、力学性能的影响。结果表明,PPR的熔点和结晶温度都随其乙烯含量的减少而升高;乙烯含量较少的体系,有利于β晶的形成;体系中β晶含量的提高,会使样品热变形温度提高,且冲击性能显著增强;乙烯含量的提高,增大了PPR β结晶的调控难度;实验室自制β成核剂,可使乙烯含量为0.25 %~5.1 %(质量分数,下同)的PPR中的β晶含量达到80 %以上。

关键词: 无规共聚聚丙烯, β成核剂, 结晶行为, 热变形温度, 力学性能

Abstract: The crystallization behaviors and thermal and mechanical properties of neat and β-nucleated polypropylene (PP) and propylene/ethylene random copolymer (PPR) were comparatively investigated. The experimental results indicated that the melting points and crystallization points of PP and PPR increased with decreasing ethylene content. Low ethylene content led to high β crystalline form. The heat distortion temperature and impact properties of PPRs were greatly improved with increasing β-form crystallites. The lab-made β-nucleator of polypropylene attributed to a high proportion of β-form in PPRs, higher than 80 %.

Key words: propylene-ethylene random copolymer, β-nucleator, crystallization behavior, heat distortion temperature, mechanical property