镍的二亚胺催化剂的负载化及其催化乙烯的聚合

化工进展

镍的二亚胺催化剂的负载化及其催化乙烯的聚合

闫新华1，谷巨明2，石艳1，李瑛琦1，赵敏坚1，付志峰1

1化工资源有效利用国家重点实验室，北京化工大学，北京 100029；2中国科学技术信息研究所，北京 100038

出版日期:2011-09-05 发布日期:2011-09-05

Immobilization of Ni（II）-α-diimine catalyst and its application to catalyzing polymerization of ethylene

YAN Xinhua1，GU Juming 2，SHI Yan1，LI Yingqi 1，ZHAO Minjian 1，FU Zhifeng1

1State Key Laboratory of Chemical Resource Utilization，Beijing University of Chemical Technology，Beijing 100029，China；2 Institute of Scientific and Technical Information of China，Beijing 100038，China

Online:2011-09-05 Published:2011-09-05

摘要/Abstract

摘要：

将Ni（II）的二亚胺催化剂[(2,6-i-PrPh)₂DABAn]NiBr₂通过物理吸附法负载在硅胶上，并将负载化催化剂在正己烷作溶剂的条件下用于催化乙烯的配位聚合，通过GPC、DSC、IR等对聚合物性能进行了表征，并与均相催化剂催化烯烃聚合进行对比。结果表明：通过物理吸附法所得负载化催化剂Al/Ni摩尔比约为100。在正己烷作溶剂时，负载化Ni（II）的二亚胺催化剂能够催化乙烯的聚合。与均相催化剂聚合体系相比，负载化催化剂的催化效率降低，所得聚合物分子量降低，密度、熔点均增大。在一定温度下随 Al/Ni 摩尔比、乙烯压力的增大，负载化催化剂催化效率逐渐提高，聚乙烯的支化度减小，分子量、密度、熔点均增大。

Abstract:

Ni（II）-α-diimine catalyst [(2,6-i-Pr)₂C₆H₃-DAB（An）]NiBr₂ plus MAO was immobilized on the surface of silica gel by physical adsorption，and the immobilized catalyst was used to catalyze polymerization of ethylene. The polymer properties were determined by GPC，DSC，IR，and were compared with the polymer made by homogeneous catalyst. The results showed that the Al/Ni molar ratio of immobilized Ni（II）-α-diimine catalyst was about 100. And the immobilized catalyst could catalyze the homopolymerization of ethylene in n-hexane. Compared with the polymer made by the homogeneous catalyst，molecular weight of the polymer and immobilized catalyst efficiency all decreased，while density，and T_m all increased. At a specific temperature，with the increase of Al/Ni molar ratio and ethylene pressure，branching degree of polyethylenes decreased，while molecular weight，density，T_m and immobilized catalyst efficiency all increased.

闫新华1，谷巨明2，石艳1，李瑛琦1，赵敏坚1，付志峰1. 镍的二亚胺催化剂的负载化及其催化乙烯的聚合 [J]. 化工进展.

YAN Xinhua1，GU Juming 2，SHI Yan1，LI Yingqi 1，ZHAO Minjian 1，FU Zhifeng1. Immobilization of Ni（II）-α-diimine catalyst and its application to catalyzing polymerization of ethylene[J]. Chemical Industry and Engineering Progree.