PA 6/PA 612共混双向拉伸膜的制备及结晶行为研究  

Preparation and crystallization behavior of PA 6/PA 612 blended biaxially oriented film

作　　者：解娜[1] 张利建 高达利[1] 李杰[1] XIE Na;ZHANG Lijian;GAO Dali;LI Jie(SINOPEC(Beijing)Chemical Research Institute Co.,Ltd.,Beijing 100013;Polyamide Division of SINOPEC Hunan Petrochemical Co.,Ltd.,Yueyang 414000)

机构地区：[1]中石化(北京)化工研究院有限公司,北京100013 [2]中石化湖南石油化工有限公司聚酰胺部,湖南岳阳414000

出　　处：《合成纤维工业》2024年第5期14-19,共6页China Synthetic Fiber Industry

基　　金：中国石化集团公司科技开发项目(420044-1)。

摘　　要：以质量比8020的尼龙6(PA 6)和尼龙612(PA 612)共混制备PA 6/612流延膜,再经纵向和横向拉伸制得PA 6/612双向拉伸膜,考察共混膜的力学性能、熔融结晶行为、微观形貌、结晶结构,并采用Jeriorny修正的Avrami方程、Ozama方程及莫志深方法分析共混膜的非等温结晶动力学。结果表明:PA 6/612双向拉伸膜的纵向、横向抗拉强度分别为249,244 MPa,透光率为92%,雾度为5%,表现出优异的透明性和力学性能;PA 6/612流延膜的结晶温度和起始结晶温度分别为182.2℃和188.1℃,相对于纯PA 6和纯PA 612向低温方向移动,结晶能力降低;PA 6/612流延膜等温结晶过程的晶体为条带状,无黑十字消光图案,晶体尺寸较PA 6、PA 612流延膜小;PA 6/612流延膜以结构不稳定的β晶为主,含有少量α晶和γ晶,有利于双向拉伸;PA 6/612流延膜的Ozama指数在3.5~4.4,表现为三维球状生长的均相成核机理。Polyamide 6/612(PA 6/612)cast film was prepared by blending nylon 6(PA 6)and nylon 612(PA 612)at a mass ratio of 8020 and was then produced into PA 6/612 biaxially oriented film by longitudinal and transverse stretching.The mechanical properties,melt crystallization behavior,micro-morphology and crystalline structure of the blended film were investigated.The non-isothermal crystallization kinetics of the blended film were analyzed using Avrami equation,Ozama equation and Mo Zhishen method modified by Jeriorny method.The results showed that the PA 6/612 biaxially oriented film produced had longitudinal and transverse tensile strengths of 249 and 244 MPa,respectively,a light transmittance of 92%and a haze of 5%and exhibited excellent transparency and mechanical properties;the crystallization temperature and initial crystallization temperature of PA 6/612 cast film were 182.2℃and 188.1℃,respectively,showing a shift towards lower temperatures and a decrease in crystallization ability as compared with pure PA 6 and pure PA 612;the crystals of PA 6/612 cast film were strip-shaped,without black cross patterns during the isothermal crystallization process,and the crystal size was smaller than that of PA 6 and PA 612 cast films;PA 6/612 cast film was mainly composed of structurally unstableβcrystals,with a small amount ofαandγcrystals,which was conducive to the biaxially orientation;the Ozama index of PA 6/612 cast film was 3.5-4.4,indicating a homogeneous nucleation mechanism of three-dimensional spherical growth.

关 键 词：尼龙6 尼龙612 共混 流延膜 双向拉伸膜 力学性能 结晶行为 非等温结晶动力学 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]