Preparation and Isothermal Crystallization Analysis of High-tough Nylon 612/6 Copolymer Material

Wen-tao CHAN; Xi-ming QU; Hao YU; Feng JIANG; Xiao-pei JIN; Chun-xiao YU; Jin-hua WANG

doi:10.14028/j.cnki.1003-3726.2019.07.006

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Preparation and Isothermal Crystallization Analysis of High-tough Nylon 612/6 Copolymer Material

更新时间：2022-09-02

- Preparation and Isothermal Crystallization Analysis of High-tough Nylon 612/6 Copolymer Material
- Polymer Bulletin Vol. 32, Issue 7, Pages: 44-51(2019)
- 作者机构：
  
  1.纤维材料改性国家重点实验室　东华大学材料科学与工程学院，上海 201620
  2.中国纺织科学研究院有限公司　生物源纤维制造技术国家重点实验室，北京 100025
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2019.07.006
  CLC：
- Published：20 July 2019，
  
  Received：20 November 2018，
  
  Revised：02 April 2019，
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Wen-tao CHAN, Xi-ming QU, Hao YU, Feng JIANG, Xiao-pei JIN, Chun-xiao YU, Jin-hua WANG. Preparation and Isothermal Crystallization Analysis of High-tough Nylon 612/6 Copolymer Material. [J]. Polymer Bulletin 32(7):44-51(2019)
DOI：

Wen-tao CHAN, Xi-ming QU, Hao YU, Feng JIANG, Xiao-pei JIN, Chun-xiao YU, Jin-hua WANG. Preparation and Isothermal Crystallization Analysis of High-tough Nylon 612/6 Copolymer Material. [J]. Polymer Bulletin 32(7):44-51(2019) DOI： 10.14028/j.cnki.1003-3726.2019.07.006.

摘要

利用5L聚合釜，采用熔融聚合的方法合成了尼龙612/6共聚物，探究不同质量分数的己内酰胺（CPL）对尼龙612/6共聚物材料力学性能的影响，并通过端基滴定、切片含水率和X射线衍射（XRD）分析CPL添加量对尼龙612/6共聚物力学性能影响的原因；确定CPL的质量分数为15%时，尼龙612/6共聚物能够获得较佳的综合力学性能，与尼龙612相比，缺口冲击性能提高113%，断裂伸长率提高127%，拉伸强度下降8%，弯曲强度下降28%；对尼龙612和质量分数为15%CPL的尼龙612/6共聚物的等温结晶行为进行了研究，利用Avrami方程分析得出，Avrami指数n分別在2.02～2.53和2.23～2.38之间，尼龙612和尼龙612/6共聚物的等温结晶过程均为二次成核，成核后沿着晶核二维盘状生长；利用Arrhenius方程求出两者的等温结晶活化能ΔE分别为-756. 38kJ/mol和-115. 09kJ/mol。

Abstract

The nylon 612/6 copolymer was synthesized by melt polymerization using a 5L polymerizer. The effects of different mass fractions of caprolactam (CPL) on the mechanical properties of nylon 612/6 copolymer were investigated. The reasons for the influence of CPL addition on the mechanical properties of nylon 612/6 copolymer were determined by end group titration

section moisture content and X-ray diffraction(XRD)test. The mass fraction of CPL was determined to be 15% nylon 612/6 copolymer can obtain better mechanical properties. Compared with nylon 612: the notched impact strength is improved by 113%; the elongation at break is increased by 127%; the tensile strength is decreased by 8%; the bending strength is decreased by 28%; and the isothermal crystallization behavior of nylon 612 and nylon 612/6 with a mass fraction of 15% CPL was analyzed by Avrami equation. The Avrami index n was between 2.02~2.53 and 2.23~2.38

respectively. Isothermal crystallization process of nylon 612 and nylon 612/6 copolymers is secondary nucleation. After nucleation

it grows along the crystal nucleus in two dimensions. At the same time

the Arrhenius equation is used to determine the isothermal crystallization activation energy ΔE was —756.38kJ/mol and —115.09kJ/mol

respectively.

关键词

尼龙612尼龙612/6力学性能等温结晶动力学

Keywords

Nylon 612Nylon 612/6Mechanical propertiesIsothermal crystallization kinetics

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