聚酯PTT及PTT/PBT共混体系的结晶形态  

Crystalline morphologies of PTT and PTT/PBT blends

作　　者：袁海琴 程凤梅[1] 李海东[1] 郑雅轩 吴倩倩 YUAN Haiqin;CHENG Fengmei;LI Haidong;ZHENG Yaxuan;WU Qianqian(College of Material and Textile Engineering ,Jiaxing University ,Jiaxing 314001 , China)

机构地区：[1]嘉兴学院材料与纺织工程学院,浙江嘉兴314001

出　　处：《弹性体》2018年第3期29-34,共6页China Elastomerics

基　　金：嘉兴学院重点SRT资助项目(85171706);嘉兴学院实验室开放基金(201803);浙江省"十二五"省级实验教学示范中心重点建设项目

摘　　要：选取均聚物聚对苯二甲酸丙二醇酯(PTT)及PTT/聚对苯二甲酸丁二醇酯(PBT)共混物为研究对象,以偏光显微镜(POM)和X射线衍射(XRD)为研究手段探讨了均聚物PTT的结晶形态,以及结晶温度、共混物的组成、等温结晶时间等因素对PTT/PBT共混物结晶形态和性能的影响。结果表明,PTT形成环带球晶的条件是155℃,PTT/PBT共混物的结晶尺寸由于PBT的引入而变小,在PTT质量分数小于60%以后就不能产生环带球晶;PTT/PBT共混物结晶时是两个组分各自结晶,并且相互竞争,使其生成环带球晶的关键是结晶组分的结晶速率要和非结晶组分之扩散速率相匹配。We explored the crystallization of pure poly（trimethylene terephthalate） （PTT） and a series of PTT/poly（butylene terephthalate） （PTT/PBT） blends, including the morphologies of pure PTT under different crystallization temperatures, and the influence of crystallization temperature, time and different contents on the morphologies, and crystallization behavior of PTT/PBT blends. Our study was based on polarizing optical microscopy and X ray diffraction.For the crystallization of pure PTT, ring banded spherulite presented under 155 ℃.The employment of PBT led to smaller diameter of the spherulite;however,when the weight ratio of PTT was below 60% （wt）, ring banded spherulite disappeared.The crystallization of PTT and PBT were found independently and competing with each other.The regularity ring banded spherulite was determined by the integrity of the crystallization rate of crystalline domain and diffusion rate of amorphous domain.

关 键 词：聚对苯二甲酸丙二醇酯 等温结晶 环带球晶 聚对苯二甲酸丁二醇酯 结晶形态 

分 类 号：O631[理学—高分子化学]