中国塑料 ›› 2022, Vol. 36 ›› Issue (10): 15-22.DOI: 10.19491/j.issn.1001-9278.2022.10.003

• 材料与性能 • 上一篇    下一篇

半芳香族聚酰胺6T/6I/6的合成及其非等温结晶动力学研究

周阳, 赵世坤, 赵彪, 刘会鹏, 黎杰, 曹志文, 潘凯()   

  1. 北京化工大学材料科学与工程学院,北京 100029
  • 收稿日期:2022-06-09 出版日期:2022-10-26 发布日期:2022-10-27
  • 通讯作者: 潘凯(1978—),男,研究员,从事新型聚酰胺树脂制备研究工作,pankai@mail.buct.edu.cn
    E-mail:pankai@mail.buct.edu.cn

Synthesis and nonisothermal crystallization kinetic study of semi⁃aromatic polyamide 6T/6I/6

ZHOU Yang, ZHAO Shikun, ZHAO Biao, LIU Huipeng, LI Jie, CAO Zhiwen, PAN Kai()   

  1. College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China
  • Received:2022-06-09 Online:2022-10-26 Published:2022-10-27
  • Contact: PAN Kai E-mail:pankai@mail.buct.edu.cn

摘要:

采用成盐、高温溶液缩聚两步法成功制备了半芳香族聚酰胺(PA)6T/6I/6。通过傅里叶变换红外光谱(FTIR)、氢核磁共振(1H⁃NMR)分析了其分子链结构,并对其力学性能进行了测试表征,利用差示扫描量热法(DSC)对PA6T/6I/6的非等温结晶动力学进行了研究,使用Jeziorny法、Oazawa法和莫志深法修正的Avrami方程分别分析了PA6T/6I/6的非等温结晶行为。结果表明,通过Jeziorny法处理发现结晶过程分为主期结晶和次期结晶2个阶段,主期结晶阶段Avrami指数在1.08~1.09之间,晶体为异相成核,呈一维针状生长,次期结晶阶段Avrami指数在2.13~2.21之间,晶体为二维片状生长方式;Ozawa法处理曲线相关性低,表明不适用于描述PA6T/6I/6的非等温结晶过程;莫志深法修正的Avrami方程能较好地描述结晶过程,a值在0.89~0.90之间,FT)值在7.24~15.85之间;采用Kissinger方程计算求得PA6T/6I/6的非等温结晶活化能为-294.17 kJ/mol。

关键词: 聚酰胺, 差示扫描量热法, 非等温结晶动力学, 结晶活化能

Abstract:

A semi⁃aromatic polyamide 6T/6I/6 (PA6T/6I/6) was synthesized using a two⁃step method through salt forming and high⁃temperature solution polycondensation. Its nonisothermal crystallization kinetics was investigated by differential scanning calorimetry (DSC), and its nonisothermal crystallization behaviors of PA6T/6I/6 was studied using the Jeziorny′s method, the Oazawa′s method, and Avrami′s equation modified by the Mo′s method. The results indicated that there were two stages in the crystallization process of PA6T/6I/6, including primary crystallization and secondary crystallization. In the primary crystallization stage, the Avrami index varies from 1.08 to 1.09, resulting in the formation of crystals through heterogeneous nucleation and growth in a one⁃dimensional needle shape. In the secondary crystallization stage, the Avrami index was in the range of 2.13~2.21, leading to the two⁃dimensional sheet growth of crystals. The Ozawa′s method is not suitable for describing the nonisothermal crystallization process of PA6T/6I/6. The modified Avrami′s equation can describe the crystallization process better, with a value of (a) between 0.89 and 0.90 and a value of F(T) between 7.24 and 15.85. The activation energy for the nonisothermal crystallization of PA6T/6I/6 was calculated to be 294.17 kJ/mol using the Kissinger′s equation.

Key words: polyamide, differential scanning calorimetry, non?isothermal crystallization kinetics, crystallization activation energy

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