高校化学工程学报2017，Vol.31Issue(2)：428-433,6.DOI:10.3969/j.issn.1003-9015.2017.02.023
马来酸酐/苯乙烯熔融接枝无规共聚聚丙烯的流变及结晶行为
Rheology and Crystallization of Maleic Anhydride/Styrene Melt Grafted Random Copolypropylene
摘要
Abstract
Maleic anhydride/styrene melt grafted random copolypropylene (MPP) was prepared by multi-monomer melt grafting. Investigation on dynamic rheological properties of MPP indicates the existence of long chain branched structure. Isothermal crystallization behavior of PPR (random copolypropylene) and MPP was measured using differential scanning calorimetry (DSC) and the kinetics of isothermal crystallization was analyzed with Avrami equation. Effects of relative grafting degree of maleic anhydride on the kinetics of isothermal crystallization of MPP were examined. The results show that MPP crystallization rate is higher than that of PPR, and it increases with the increase of grafting degree. The isothermal crystallization of PPR and MPP is controlled by nucleation rate at high temperature region. The long chain branched structure can promote nucleation formation of MPP, which results in the increase of crystallization rate. The results of polarized light microphotographs verify that the long chain branched structure can promote heterogeneous nucleation and decrease crystal size. The crystal size of MPP decreases with the increase of grafting degree.关键词
无规共聚聚丙烯/熔融接枝/接枝率/长支链/结晶Key words
random copolypropylene/melt grafting/grafting degree/long chain branched/crystallization分类
化学化工引用本文复制引用
刘晶如,许淑义,俞强..马来酸酐/苯乙烯熔融接枝无规共聚聚丙烯的流变及结晶行为[J].高校化学工程学报,2017,31(2):428-433,6.基金项目
江苏高校优势学科建设工程资助项目. （）
