中国塑料2024，Vol.38Issue(1)：7-13,7.DOI:10.19491/j.issn.1001-9278.2024.01.002
离子改性对宽分子量分布聚丙烯黏弹性能影响
Effect of ion modification on viscoelasticity of broad molecular weight distribution polypropylene
摘要
Abstract
PP4 was obtained through treating polypropylene with a wide molecular weight distribution(BMWDPP)PP1 using an ion modifier.The molecular structures and rheological properties of PP1 and PP4 were investigated by gel per-meability chromatography(GPC),plate rotational rheology,stretch rheology,and melt strength tests.The PP degrada-tion induced by free radicals reduced the molecular weight and polydispersity of BMWDPP.There was no real long branch chain structure generated due to the"long-like branched chain"effect of the ionic interaction between the metal salts on the PP chain segment.PP4 exhibits a stretch hardening phenomenon.The large molecular weight components could weaken the molecular entanglement,whereas the small molecular weight components could enhance the plasticiz-ing effect due to the degradation of PP4.This makes its viscoelasticity lower than that of PP1.The influence of stretch strain hardening on the enhancement of melt strength is stronger than the effect of molecular weight reduction on the weakening of melt strength.Therefore,the melt strength of PP4 is higher than that of PP1 at different temperatures.This indicated that the PP was featured with linear large molecular chains at low temperature and long branched chains at high temperature.关键词
宽分子量分布聚丙烯/离子改性/黏弹性/拉伸应变硬化/熔体强度Key words
broad molecular weight distribution polypropylene/ion modification/viscoelasticity/stretch hardening/melt strength分类
化学化工引用本文复制引用
徐耀辉,唐伊文,郭鹏,吕明福..离子改性对宽分子量分布聚丙烯黏弹性能影响[J].中国塑料,2024,38(1):7-13,7.基金项目
中国石油化工股份有限公司资助项目(421037-1) （421037-1）
