中国塑料 ›› 2025, Vol. 39 ›› Issue (2): 6-11.DOI: 10.19491/j.issn.1001-9278.2025.02.002

• 材料与性能 • 上一篇    下一篇

双螺杆反应挤出长支链接枝对宽分子量分布聚丙烯性能的影响

许巍(), 吕明福, 杜文杰, 郭鹏, 徐耀辉()   

  1. 中国石化北京化工研究院,北京 100013
  • 收稿日期:2024-05-15 出版日期:2025-02-26 发布日期:2025-02-27
  • 通讯作者: 徐耀辉(1980—),男,研究员,从事聚合物轻量化材料开发研究,xuyh.bjhy@sinopec.com
    E-mail:xuw02.bjhy@sinopec.com;xuyh.bjhy@sinopec.com
  • 作者简介:许巍(2000—),男,硕士研究生,从事聚烯烃分子结构等研究,xuw02.bjhy@sinopec.com
  • 基金资助:
    ] 钟文发.非线性规划在可燃毒物配置中的应用[C]// 赵玮.运筹学的理论与应用:中国运筹学会第五届大会论文集.西;例[1] 王权,瞿金平. 动态成型过程中PP/CaCO3 填充体系的流变行为[J]. 高分子材料科学与工程,2007,23:176?179

Effect of chain⁃branched structure on properties of polypropylene with broad molecular weight distribution based on twin⁃screw reactive extrusion

XU Wei(), LYU Mingfu, DU Wenjie, GUO Peng, XU Yaohui()   

  1. Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China
  • Received:2024-05-15 Online:2025-02-26 Published:2025-02-27
  • Contact: XU Yaohui E-mail:xuw02.bjhy@sinopec.com;xuyh.bjhy@sinopec.com

摘要:

以兼备良好力学性能与加工性能的宽分子量分布聚丙烯为原料,使用生产效率更高的双螺杆反应挤出法,采取自由基熔融接枝的方式以2种不同反应挤出温度来制备长支链聚丙烯,并研究了接枝长支链对于材料性能的影响。通过凝胶渗透色谱仪器(GPC)、傅里叶红外光谱仪(FTIR)和流变仪表征改性产物的分子量及其分布、单体接枝率以及拉伸流变行为,从而证明长支链的成功制备。力学性能测试结果表明,改性产物的力学性能随着反应温度的增加而下降。随着长支链含量的增加,力学性能可小幅度回升。差示扫描量热分析结果表明,随着长支链含量的增加,结晶温度得到显著提升。加工温度200 ℃且单体添加量为4 %(质量分数,下同)时结晶温度升高11 ℃。

关键词: 宽分子量分布, 聚丙烯, 双螺杆, 反应挤出, 长支链

Abstract:

The polypropylene (PP) with a broad molecular weight distribution was used as a matrix for preparing long⁃branched chain PP due to its excellent mechanical properties and processability. The twin⁃screw reactive extrusion was carried out to prepare the long branched⁃chain PP, enhancing the production efficiency. Additionally, melt radical grafting was conducted at two different temperature. The effect of long chain⁃branched structure on the properties of PP was investigated by using gel permeation chromatography, Fourier⁃transform infrared spectroscopy, and rheometry to determine the molecular weight and distribution, grafting degree, and tensile rheological behavior of the of the as⁃prepared PP. The mechanical test results indicated that the mechanical properties of the as⁃prepared PP decreased with an increase in the reaction temperature; however, its mechanical strength increased slightly with an increase in the content of long branched chains. The thermal analysis demonstrated that there was a significant increase in the crystallization temperature of PP but a decrease in its degree of crystallinity with an increase in the content of long branched chains. The crystallization temperature was increased by 11 ℃ at a processing temperature of 200 ℃ and a monomer content of 4 wt% compared to pure PP.

Key words: broad molecular weight distribution, polypropylene, twin?screw, reaction extrusion, long branched chain

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