中国塑料 ›› 2022, Vol. 36 ›› Issue (11): 59-66.DOI: 10.19491/j.issn.1001-9278.2022.11.009

• 材料与性能 • 上一篇    下一篇

PVDF/PMMA共混物非等温结晶动力学和晶体结构

陈聪博, 范烁, 张锐, 李辉, 罗思琪, 任伊锦()   

  1. 湖北汽车工业学院材料科学与工程学院,湖北 十堰 442002
  • 收稿日期:2022-08-04 出版日期:2022-11-26 发布日期:2022-11-25
  • 通讯作者: 任伊锦(1978—),女,副教授,从事高分子结晶、锂电池聚合物隔膜研究,renyijin@126.com
    E-mail:renyijin@126.com
  • 基金资助:
    湖北省自然科学基金(2015CFC786);湖北汽车工业学院国家级大学生创新创业训练计划项目(DC2022048)

Non⁃isothermal crystallization kinetics and crystal structure of PVDF/PMMA blends

CHEN Congbo, FAN Shuo, ZHANG Rui, LI Hui, LUO Siqi, REN Yijin()   

  1. School of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002,China
  • Received:2022-08-04 Online:2022-11-26 Published:2022-11-25
  • Contact: REN Yijin E-mail:renyijin@126.com

摘要:

通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)对纯聚偏氟乙烯(PVDF)和PVDF/聚甲基丙烯酸甲酯(PMMA)共混物在不同降温速率下的非等温结晶行为和晶体结构进行表征和分析,并采用Jeziorny法和莫志深法研究了各组样品的非等温结晶动力学。结果表明,PMMA含量过多(PVDF/PMMA质量比为6/4和5/5)会完全抑制PVDF结晶;对于纯PVDF和可结晶的共混物(PVDF/PMMA质量比为9/1、8/2、7/3)样品,随着PMMA含量的增加,共混物结晶温度先升高后降低,结晶速率先少许增大后减小,说明少量PMMA起异相成核作用,可促进共混物结晶,而大量PMMA可明显阻碍分子重排,抑制其结晶;PMMA的加入可促进共混物晶体结构向低维转变;共混物晶体结构主要是α晶型,PMMA含量的增加不改变共混物的晶型,且使共混物结晶度先增大后减小。

关键词: 聚偏氟乙烯, 聚甲基丙烯酸甲酯, 结晶度, 晶型, 非等温结晶动力学

Abstract:

The non⁃isothermal crystallization behavior and crystal structure of poly(vinylidene fluoride) (PVDF)/poly(methyl methacrylate) (PMMA) blends were investigated at different cooling rates using differential scanning calorimeter and X⁃ray diffractometer, and their non⁃isothermal crystallization kinetics were studied using the Jeziorny’s equation and Mo’s method. The results indicated that a high mass ratio of PVDF to PMMA (6/4 and 5/5) completely inhibited the crystallization of PVDF. For the crystallizable blending samples at mass ratios of PVDF to PMMA of 9/1, 8/2, and 7/3, their crystallization temperature increased at first and then tended to decrease with an increase in the proportion of PMMA. However, their crystallization rate increased slightly at first and then decreased. A small amount of PMMA could generate a heterogeneous nucleation to promote the crystallization of the PVDF domain in the blends, whereas a large amount of PMMA evidently hindered the molecular rearrangement of PVDF and inhibited its crystallization. The addition of PMMA promoted the crystal structure transform of the PVDF phase to lower dimensions. The crystal structure of the PVDF phase was mainly the α⁃form crystal and was not influenced by the increase of PMMA content. This resulted in an increase at first and then a decrease in the degree of crystallinity.

Key words: poly(vinylidene fluoride), poly(methyl methacrylate), crystallinity, crystal form, non?isothermal crystallization kinetics

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