中国塑料 ›› 2023, Vol. 37 ›› Issue (1): 18-25.DOI: 10.19491/j.issn.1001-9278.2023.01.004

• 材料与性能 • 上一篇    下一篇

石墨微片对聚三氟氯乙烯结晶及性能的影响

李毅, 樊桂琪, 吴天宇, 叶海木()   

  1. 中国石油大学(北京) 新能源与材料学院,北京 102249
  • 收稿日期:2022-10-18 出版日期:2023-01-26 发布日期:2023-01-26
  • 通讯作者: 叶海木(1983—),男,教授,主要从事高分子材料合成及性能调控研究, yehaimu@cup.edu.cn
    E-mail:yehaimu@cup.edu.cn
  • 基金资助:
    国家自然科学基金(21674128);中国石油大学(北京)科研基金(2462020YXZZ019)

Effect of graphite micro⁃sheets on crystallization and properties of polychlorotrifluoroethylene

LI Yi, FAN Guiqi, WU Tianyu, YE Haimu()   

  1. College of New Energy and Materials,China University of Petroleum,Beijing 102249,China
  • Received:2022-10-18 Online:2023-01-26 Published:2023-01-26
  • Contact: YE Haimu E-mail:yehaimu@cup.edu.cn

摘要:

采用熔融共混工艺制备了聚三氟氯乙烯(PCTFE)/石墨微片(GMS)复合材料,研究了GMS含量对复合材料的结晶行为、力学性能、微观结构、动态热力学性能与阻隔性能的影响,并对导致体系性能变化的机制进行了探讨。结果表明,GMS的加入提高了复合材料的力学强度与刚性。当GMS含量为0.3 %(质量分数,下同)时,PCTFE/GMS⁃0.3的拉伸强度可达50.5 MPa,较PCTFE提升了22 %。当GMS含量为2 %时,PCTFE/GMS⁃2的弹性模量与损耗模量为1 091 MPa与1 233 MPa,较PCTFE分别提升了36 %与60 %。并且,复合材料的玻璃化转变温度也有明显升高,较PCTFE增大了7~12 ℃。力学性能的提升可归因于GMS对PCTFE基体的增强作用。同时,GMS也能促进PCTFE成核,且少量GMS还可提高PCTFE的结晶度。此外,GMS对提升PCTFE的阻隔性能效果显著。随GMS含量的增加,复合材料的氢气渗透系数逐渐降低。当GMS含量为2 %时,PCTFE/GMS⁃2的氢气渗透系数可低至2.78×10-15 cm3·cm/(cm2·h·Pa),较PCTFE下降了49 %。

关键词: 聚三氟氯乙烯, 石墨微片, 结晶行为, 力学性能, 微观结构, 阻隔性能

Abstract:

Polychlorotrifluoroethylene (PCTFE)/graphite micro⁃sheets (GMS) composites were prepared through melt blending, and the effect of GMS content on the crystallization behavior, mechanical properties, microstructure, dynamic thermo⁃mechanical properties, and barrier properties of the composites were investigated. Meanwhile, the mechanisms for the variation of the properties were discussed. The results indicated that the addition of GMS improved the mechanical strength and rigidity of the composites. The PCTFE/GMS composite exhibited tensile strength of 50.5 MPa at a GMS loading of 0.3 wt%. This result is 22 % higher than that of pure PCTFE. When 2 wt% of GMS was added, the PCTFE/GMS⁃2 composite obtained an elastic modulus of 1 091 MPa and a loss modulus of 1 233 MPa, which increased by 36 % and 60 %, respectively, compared to pure PCTFE. Moreover, the glass transition temperatures of the composites were also improved significantly, which was 7~12 ℃ higher than that of pure PCTFE. The change of mechanical properties is attributed to the reinforcing effect of high⁃strength GMS on the PCTFE matrix. Simultaneously, GMS could promote the nucleation of PCTFE, and a small amount of GMS enhanced its crystallinity. In addition, GMS enhanced the barrier performance of PCTFE effectively, and its hydrogen permeation coefficient decreased gradually with an increase in the GMS content. When 2 wt% of GMS was added, the PCTFE/GMS composites obtained a permeation coefficient of 2.78×10-15 cm3·cm/(cm2·h·Pa), which was 49 % lower than that of PCTFE.

Key words: polychlorotrifluoroethylene, graphite micro?sheet, crystallization behavior, mechanical property, microst?ructure, barrier property

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