文章摘要
通过聚丙烯/聚乙烯二元体系的流变控制制备聚合物多层片材
Preparation of Multilayer Sheets by Controlling the Rheological Behavior of PP/PE Binary System
  
DOI:10.16865/j.cnki.1000-7555.2018.06.019
中文关键词: 多层结构  流变行为  二元体系  粘性包覆
英文关键词: multilayer structure  rheological behavior  binary system  viscous encapsulation
基金项目:国家自然科学基金资助项目(21674069,51721091)
作者单位
楚 佳, 陈文博, 陈历波, 张 娅, 吴高高, 冯建民, 杨鸣波 四川大学高分子科学与工程学院 高分子材料工程国家重点实验室四川 成都 610065 
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中文摘要:
      通过毛细管流变仪研究了二元聚合物体系的分相流动行为,以及在动态外场作用下的演变规律,利用低黏度熔体包覆高黏度熔体的“粘性包覆”现象,筛选出具有满足分相流动条件并特定黏度比的聚乙烯(PE)和聚丙烯(PP),成功地一次成型制备出多层聚合物膜片。利用凝胶色谱仪、偏光显微镜、有限元分析软件等对PP/PE二元体系的形态结构进行了研究,并探讨了分层流动的机理。结果表明,通过PE/PP黏度比可以控制材料流变行为,从而制备“核壳”结构和PP-PE-PP“三明治”结构,并优化出最适宜的加工窗口。同时,发现流动过程中PP和PE的径向速度是不同的,分层流动是材料粘弹性和加工流场共同作用的结果。
英文摘要:
      Phase segregation and the evolution law of binary polymer system under the action of dynamic field were investigated by capillary rheometer. PE and PP with specific viscosity, meeting the requirements of phase-segregation, were chosen in our work. Multilayer sheets were successfully prepared by a single-screw extruder on the basis of "viscous encapsulation" phenomenon, which always caused the high viscosity fluid sandwiched by the low viscosity fluid. Gel permeation chromatography, polarized optical microscopy and finite element analysis software were used to study the structure and mechanism of stratified flow. The results reveal that, "core-shell" and PP-PE-PP "sandwich" structure can be obtained by controlling the rheological behavior of the material by control of the viscosity ratio of PE/PP, meanwhile, there exists aoptimized optimum processing window. Further more, it is found that the radial velocity of PP and PE is different, stratified flow attributes to material viscoelasticity and processing flow field.
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