长链支化LLDPE的制备及表征  

Preparation and Characterization of Long Chain Branching LLDPE

作　　者：蔡传伦[1] 张晓红[1] 候丽萍[1] 宋志海[1] 张红彬[1] 高建明[1] 赖金梅[1] 王亚[1] 黄源[1] 乔金樑[1] 

机构地区：[1]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《塑料科技》2009年第10期30-33,共4页Plastics Science and Technology

基　　金：国家重大基础研究专项经费(2005CB623805)资助项目

摘　　要：利用预辐照线型低密度聚乙烯(rLLDPE)引发基体LLDPE的长链支化反应,制备出长链支化LLDPE。研究了辐照剂量、rLLDPE用量对长链支化反应的影响,并通过熔体流动速率测试、凝胶渗透色谱、13CNMR和扭矩试验对长链支化LLDPE进行了表征。结果表明:与基体LLDPE相比,长支链化LLDPE的熔体流动速率下降,加工扭矩下降,熔体流动速率比(M10/M2)明显增大;形成长链支化的最佳辐照剂量为15kGy、rLLDPE最佳用量为50%;由13CNMR方法计算的长链支化数达1.4/10000C。Long chain branching LLDPE was prepared via initiating the long chain branching reaction of matrix LLDPE by preirradiated LLDPE. The effects of irradiation dose, rLLDPE content on the long chain branching reaction were studied. The long chain branching LLDPE was characterized by MFR test, GPC, 13C NMR and torque test. The results show that： compared with matrix LLDPE, the MFR and processing torque of long chain branching LLDPE decrease, the MFR ratio （MtolM2） increases obviously; the optimum irradiation dose is 15kGy, and the optimum rLLDPE content is 50% for long chain branching reaction; the long chain branching amount is up to 1.4110 000C determined by 13C NMR.

关 键 词：线型低密度聚乙烯 预辐照 长链支化 加工性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]