中国塑料 ›› 2021, Vol. 35 ›› Issue (9): 81-86.DOI: 10.19491/j.issn.1001-9278.2021.09.013

• 加工与应用 • 上一篇    下一篇

聚碳酸酯动态黏弹性能与分子取向态的关系

罗飞1,2(), 李翠娟1, 刘卓佳1, 刘雨欣1, 石素宇2,3, 党旭丹1, 刘春太2, 赵永涛1   

  1. 1.河南工程学院机械工程学院,郑州 451191
    2.郑州大学橡塑模具国家工程研究中心,郑州 450002
    3.河南工程学院材料工程学院,郑州 451191
  • 收稿日期:2021-01-29 出版日期:2021-09-26 发布日期:2021-09-23
  • 作者简介:罗飞(1984—),男,讲师,主要从事高聚物及聚合物基复合材料的成型加工等研究,jeffery_luo@haue.edu.cn
  • 基金资助:
    河南省高等学校重点科研项目(20B430002);河南工程学院博士培育基金(DKJ2019022);河南省科技攻关项目(182102210030)

Study on Relationship between Molecular Orientation and Dynamic Viscoelasticity of Polycarbonate

LUO Fei1,2(), LI Cuijuan1, LIU Zhuojia1, LIU Yuxin1, SHI Suyu2,3, DANG Xudan1, LIU Chuntai2, ZHAO Yongtao1   

  1. 1.College of Mechanical Engineering,Henan Institute of Engineering,Zhengzhou 451191,China
    2.National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002,China
    3.College of Materials Engineering,Henan Institute of Engineering,Zhengzhou 451191,China
  • Received:2021-01-29 Online:2021-09-26 Published:2021-09-23

摘要:

将双酚A型聚碳酸酯(PC)注射成型,基于流动残余应力与分子取向关系的讨论,利用光学双折射法表征样品中的平均分子取向,并考察其动态力学性能。结果表明,近浇口取向大于远浇口,且分子取向态与其动态黏弹性参数间存在关联。当选取损耗角正切值(tanδ)=1的损耗模量值时,发现更高的积分双折射值对应更小的损耗模量,即取向越大动态黏度越小;当储能模量选取玻璃态平台末端值时,尽管双折射值与储能模量的关系受自由体积因素干扰相对不明朗,但材料依然表现出弹性随取向增加而增加的整体趋势。

关键词: 聚碳酸酯, 分子取向, 黏弹性, 储能模量, 损耗模量

Abstract:

Bisphenol?A polycarbonate (PC) plates were prepared through precision injection molding. Based on the relationship between residual flow?induced stresses and molecular orientation, an optical birefringence method was used to investigate the average molecular orientation of the PC plates, and their dynamic mechanical properties were also studied. The experimental results indicated that the plate samples near the gate had a larger molecular orientation than those far from the gate. There is a certain relationship between the orientation and dynamic viscoelasticity. When the loss modulus (tan δ) was selected to be 1, the larger the birefringence, the smaller the dynamic viscosity. This means that the samples with large orientation have small viscosity. When the storage modulus at the end of the glassy platform was selected, the elasticity of the PC plates increased with an increase in orientation, although the dependency was not obvious due to the interference from free volume.

Key words: polycarbonate, molecular orientation, viscoelasticity, storage modulus, loss modulus

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