热拉伸对尼龙6薄膜微观结构与力学性能的影响

doi:10.11896/cldb.19120228

材料导报

2021, Vol. 35

Issue (6): 6194-6199 https://doi.org/10.11896/cldb.19120228

高分子与聚合物基复合材料

热拉伸对尼龙6薄膜微观结构与力学性能的影响

刘轶, 刘跃军, 李祥刚, 崔玲娜, 刘小超, 李樟华, 范淑红

湖南工业大学先进包装材料与技术湖南省重点实验室,株洲 412007

Effect of Hot Stretching on Microstructure and Mechanical Properties of Nylon 6 Films

LIU Yi, LIU Yuejun, LI Xianggang, CUI Lingna, LIU Xiaochao, LI Zhanghua, FAN Shuhong

Hunan Provincial Key Laboratory of Advanced Packaging Materials and Technology of Hunan University of Technology, Zhuzhou 412007,China

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摘要本工作研究了尼龙6(PA6)薄膜的热拉伸工艺对其微观结构和力学性能的影响规律。在玻璃化转变温度(T_g)到熔点(T_m)之间的加工温度范围内对PA6薄膜进行了不同程度的单向热拉伸,并对其微观结构与力学性能进行表征测试。结果表明:随着拉伸温度和拉伸比的提高,PA6中的β晶型向α晶型的转变程度增大,促进了PA6中分子链沿拉伸方向的结晶和取向,从而显著提高了PA6的结晶度,并发现其无定形区减少,玻璃化转变温度(T_g)提高。拉伸温度的提高有利于PA6中α(002)晶面的生长,高温下拉伸形成的α晶体更完整;随着拉伸比的提高,形成的α晶体完整程度先升高后降低。热拉伸后的PA6薄膜的拉伸强度和储能模量增加,断裂伸长率降低;与未拉伸的PA6薄膜相比,拉伸温度为160 ℃、拉伸比为3的PA6薄膜拉伸强度增加371%,断裂伸长率降低235%。

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关键词: 尼龙6 薄膜热拉伸

Abstract: The effect of the hot stretching process on the microstructure and mechanical properties of nylon 6 (PA6) films was studied. The PA6 films were treated by uniaxial hot stretching in the temperature range of glass transition temperature (T_g) and melting point (T_m), and microstructure and mechanical properties of the films were characterized. The results show that with the increasing of the tensile temperature and the tensile ratio, the degree of transformation from β crystal form to α crystal form in PA6 was increasing, which promotes the crystallization and orientation of the molecular chain in PA6 along the stretched direction, thus significantly improved the crystallization degree of PA6. Moreover, it is found that the amorphous region decreased and the glass transition temperature (T_g) increased. The increase of tensile temperature is beneficial to the growth of α crystal plane in PA6, and the more complete α crystal is formed at high temperatures. With the increase of the tensile ratio, the integrity degree of α crystal increased at first and then decreased. After hot stretching, the tensile strength and storage modulus of PA6 films increased, yet the elongation at break decreased. Compared with unstretched PA6 films, the tensile strength of PA6 films at the tensile temperature of 160 ℃ and the tensile ratio of 3 was increased by 371%, and the elongation at break decreased by 235%.

Key words: nylon 6 films hot stretching

出版日期: 2021-03-25 发布日期: 2021-03-23

ZTFLH:

TQ316

基金资助: 国家自然科学基金(11872179);湖南省自然科学基金(2018JJ4072);湖南省高校创新平台开放基金(18K079);湖南省教育厅科学研究项目(18B288;19A138)

通讯作者: yjliu_2005@126.com;lixiangfm@163.com

作者简介: 刘轶,2020年6月毕业于湖南工业大学,获得工程硕士学位,主要从事尼龙薄膜的拉伸与流变性能研究。
刘跃军,博士,教授,博士研究生导师,湖南工业大学包装与材料工程学院。主要从事高分子成型加工、高分子流变学、包装新材料与技术等领域的科研工作。
李祥刚,博士,讲师,湖南工业大学高分子材料与工程系。主要从事高分子流变学、高分子材料、高分子加工等领域的科研工作。

引用本文:

刘轶, 刘跃军, 李祥刚, 崔玲娜, 刘小超, 李樟华, 范淑红. 热拉伸对尼龙6薄膜微观结构与力学性能的影响[J]. 材料导报, 2021, 35(6): 6194-6199.
LIU Yi, LIU Yuejun, LI Xianggang, CUI Lingna, LIU Xiaochao, LI Zhanghua, FAN Shuhong. Effect of Hot Stretching on Microstructure and Mechanical Properties of Nylon 6 Films. Materials Reports, 2021, 35(6): 6194-6199.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.19120228 或 http://www.mater-rep.com/CN/Y2021/V35/I6/6194

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