摘要
以水杨醛亚胺合钛催化剂为主催化剂,甲基铝氧烷为助催化剂合成了聚烯烃弹性体(POE),探索了不同聚合条件下的POE合成规律,制备得到一系列具有不同辛烯含量的聚烯烃弹性体。聚合物经过了高温核磁碳谱(13C NMR)、差示扫描量热仪(DSC)及高温凝胶渗透色谱(GPC)的表征。结果表明,催化体系聚合活性最高能达到3 498 kg/(mol·h),POE中1-辛烯摩尔分数在6%～31%之间,重均分子量可在3. 9×10~4～6. 5×10~5g/mol之间调节,分子量分布指数在1. 18～2. 63之间,玻璃化转变温度Tg均低于-42℃,与通用乙烯共聚弹性体的结构性能相近。通过聚合物链中的微观序列分布计算了反应竞聚率,结果表明,该催化剂在进行POE合成时的共聚性能要优于茂金属催化剂Cp2Zr Cl2。
Polyolefin elastomers were synthesized by using bis （phenoxyimine） titanium catalyst upon activation with methylaluminoxane（MAO） under various conditions. A series of ethylene/1-octene copolymers with varying 1-octene content were acquired. They were characterized by high temperature ^13 C-NMR, DSC and GPC. It was found that the activity of catalyst reached as high as 3 498 kg/（mol·h）. The mole ratio of 1-octene in POE was between 6% and 31%. The weight-average molecular weight could be adjusted from 3.9 ×10^4 to 6.5 ×10^5 g/mol with the polydispersity index ranging from 1. 18 -2.63. Their glass transition temperature was below -42 ℃. The microstructures and properties of samples were similar to those of general POE products. Reactivity ratios were also calculated according to the triad sequence distributions and the results showed that it was a better catalyst than Cp2ZrCl2 in the copolymerization for the synthesis of POEs.
作者
张宇婷
韩书亮
吴宁
郝建国
徐林
ZHANG Yuting, HAN Shuliang, WU Ning, HAO Jianguo, XU Lin(Yan Shan Branch of Beijing Research Institute of Chemical Industry, China Petroleum ＆ Chemical Company, National Engineering Research Center for Synthesis of Novel Rubber and Plastic Materials, Beijing 102500, China)
出处
《塑料》
CAS
CSCD
北大核心
2018年第5期117-121,129,共6页
Plastics
关键词
聚烯烃弹性体
非茂金属催化剂
1-辛烯
高温核磁碳谱
竞聚率
polyethylene elastomer
non-metallocene catalyst
1-octene
high temperature ^13C NMR
reactivity ratio
