摘要
介绍了长链支化聚丙烯制备的成熟技术；阐述了长支链对聚丙烯熔体弹性影响的机理；分析了长链支化对聚丙烯结晶行为和流变行为的影响。当前的研究表明：长支链可以显著提高聚丙烯的熔体弹性。电子束辐射进行聚丙烯的长链支化受到辐射温度、辐射剂量以及辐射的条件和后处理工艺的强烈影响；反应挤出进行聚丙烯的长链支化受到过氧化物用量及其分子结构的影响。长链支化聚丙烯的结晶行为和流变行为与线形聚丙烯存在明显差异，其初始结晶温度要高于线形聚丙烯10℃左右；流变行为表现出显著的“应变硬化”现象，从而可以有效地保证挤出发泡过程中气泡增长的稳定。
Preparation technologies of long chain branching polypropylene （LCBPP） were introduced, the effect of long chain branch on the crystallization and rheological behaviors of LCBPP and its fuctioning mechanism on the melt elesticity of LCBPP were discussed. It was concluded that the melt elasticity of linear PP could be increased remarkably by the introduction of long chain branch onto the backbone. When linear PP was irradiated by electron-beam, the irradiation dose, temperature, and annealing process influenced the resultant branching. When linear PP was subjected to reactive extrusion, the branching was affected by the dosages of peroxides and the molecular structure of PP precursor. The onset crystallization temperature of LCBPP was 10 ℃ higher than that of linear PP. LCBPP exhibited strain hardening remarkably to prevent cell coalescence during the cell growth process.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第6期7-13,共7页
China Plastics
基金
北京市自然科学基金资助（项目编号：20062008）
关键词
长链支化聚丙烯
熔体弹性
电子束辐射
反应挤出
long chain branching polypropylene
melt elasticity
electron-beam irradiation
reactive extrusion
