石油化工2013，Vol.42Issue(4)：430-434,5.
剪切和冷却速率对长支链聚丙烯晶体结构的影响
Influences of Shearing and Cooling Rate on the Crystal Structure of Long Chain Branched Polypropylene
摘要
Abstract
Crystalline samples of long chain branched polypropylene PP-g-VS/St (VS:vinyl polydimethylsiloxane; St:styrene) were prepared on a rheometer.The influences of cooling rate and shearing action on the crystal structure of PP-g-VS/St were investigated by means of WAXRD.The results indicated that α crystal and a little γ crystal were produced in PP-g-VS/St under the cooling process and α crystal and β crystal were produced in PP-g-VS/St under the shearing action.The relative content of β crystal in PP-g-VS/St first increased sharply and then leveled off with increasing shearing rate,and first increased and then decreased slightly with increasing shearing time,and increased with the rise of shearing temperature.The relative content of β crystal in PP-g-VS/St was up to 35.6％ when the shearing rate,shearing time and shearing temperature were 70 s-1,60 s and 230 ℃,respectively.Shearing action and rapid cooling were key factors for the generation of β crystal in PP-g-VS/St.关键词
长支链聚丙烯/剪切/冷却速率/β晶Key words
long chain branched polypropylene/ shearing/ cooling rate/ β crystal分类
化学化工引用本文复制引用
周帅,辛忠,赵世成..剪切和冷却速率对长支链聚丙烯晶体结构的影响[J].石油化工,2013,42(4):430-434,5.基金项目
国家自然科学基金项目(21106042) （21106042）
