丙烯酸接枝线形低密度聚乙烯的热学行为及结晶形态  

Thermal Behavior and Crystallization Morphology of Acrylic Acid Grafted Linear Low Density Polyethylene

作　　者：李文斐[1] 姚占海[2] 

机构地区：[1]长春理工大学化学与环境工程学院,吉林长春130022 [2]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室,吉林长春130022

出　　处：《中国塑料》2006年第8期17-21,共5页China Plastics

基　　金：国家自然科学基金(59873022)

摘　　要：利用差示扫描量热仪研究了丙烯酸接枝线形低密度聚乙烯(PE-LLD-g-AA)的热学行为,结果表明,与纯线形低密度聚乙烯(PE-LLD)相比,PE-LLD-g-AA的熔融温度(T_m)略有增加,结晶温度(T_c)增加大约4℃,熔融焓(ΔH_m)随AA含量的增加而降低。还利用差示扫描量热仪研究了PE-LLD和PE-LLD-g-AA的等温结晶动力学,用扫描电子显微镜观察了PE-LLD-g-AA等温结晶形态。结果表明,PE-LLD-g-AA的结晶速率大于纯PE-LLD的,随着接枝率的增加,PE-LLD的球晶半径减小,接枝到PE-LLD分子链上的AA分子起到了成核剂的作用。The thermal behavior of linear low density polyethylene-grafted-acrylic acid （PE-LLD-g-AA） was investigated using differential scanning calorimety （DSC） and compared with that of neat linear low density polyethylene （PE-LLD）. The melting temperature （Tm） of PE-LLD-g-AA was a little higher and the crystallization temperature （Tc） was about 4 ℃ higher than those neat one. The melting enthalpy （△Hm） decreased with increasing acrylic acid content. The overall crystallization rate of PE-LLD was smaller than that of grafted samples. It showed that the grafted acrylic acid units acted as a nucleating agent. SEM showed that the size of spherulites of PE-LLD-g-AA was smaller than that of PE-LLD.

关 键 词：丙烯酸 接枝 线形低密度聚乙烯 等温结晶 热学行为 

分 类 号：O632.12[理学—高分子化学]