BOPP专用树脂与薄膜材料的对比研究方法  

Comparative Investigation on Structure and Property of Biaxial Oriented Polypropylene Resins and Films

作　　者：柯扬船[1] 范颜晓[1] 王英年[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《中国塑料》2009年第4期88-93,共6页China Plastics

基　　金：国家重大基础研究项目973资助项目(1999-2004);国家自然基金资助项目(20776157)

摘　　要：对比研究国内外双向拉伸聚丙烯(BOPP)树脂的结构、性能及膜质量与树脂分子结构的定量关系。采用溶剂组分与序列含量,再结合高端与低端相对分子质量来表征树脂的差异性;以13C-NMR测定样品的非等规序列含量总大于邻二甲苯法溶出物量,并确定国内外树脂非等规序列4%～6%,差别明显;而共聚物10%以上高端相对分子质量及适量低端分子含量有助于减少断膜次数,如SEB1和SEB2共聚物PE含量0.2%～0.5%可提高相对分子质量及减少断膜次数。凝聚态研究表明,国外样品流动指数高,熔体流动剪切突变指数.γ*>1,熔体流动稳定,挤出不易产生气泡;国产树脂γ.*>1,流动性不稳定,热降解温度低,样条普遍有气泡;国外SEB1和SEB2树脂产生γ晶型,结晶度与晶粒较小而流变性稳定。国产树脂只产生β晶型,结晶度高,树脂拉伸厚膜表面有凝胶相,断面呈颗粒态,国外树脂如SEB3膜断面呈丝状态。BOPP resin and film samples of both native and abroad are investigated and compared on their molecular and condensed structure. The solvent soluble and insoluble fractionations, their molecular weight by GPC and molecular sequence identifications by ^13C-NMR were characterized to clearly distinguish the resin structure. Results showed that the random sequence of 4 %-46 % and over 10 % high molecular end were required for BOPP. The foreign resins have higher flow index, lower melt shear deformation index of γ＊〉1 and lower thermo degradation temperature than those of the native ones γ＊〉 1. There appeared gas bulbs in native samples but not in abroad ones. X-ray revealed the higher γ form, the smaller crystals and lower crystallization degree in SEB1 and SEB2 than those in the native ones. In PP copolymer with PE of 0. 2 % -0. 5 %, the high performance SEB1 and SEB2 were obtained. SEM showed the gel on thick SDB1 films with particlelike while silk-like orientation in SEE3.

关 键 词：双向拉伸 聚丙烯 分子结构 凝聚态结构 流变性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]