高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (11): 2166-2170.

• 研究论文 • 上一篇    下一篇

α-二亚胺镍(Ⅱ)配合物-TiCl4复合催化剂催化乙烯原位聚合制备支化聚乙烯

张启兴, 林少全, 吴志勇, 王海华   

  1. 中山大学化学与化学工程学院高分子研究所, 广州510275
  • 收稿日期:2003-07-08 出版日期:2004-11-24 发布日期:2004-11-24
  • 基金资助:

    国家自然科学基金(批准号:29874039);广东省自然科学基金(批准号:031598)资助

Synthesis of Branched Polyethylene via Copolymerization in situ Catalyzed by (α-diimine)nickel(Ⅱ) Complex-TiCl4 Combined and Supported Catalyst

ZHANG Qi-Xing, LIN Shao-Quan, WU Zhi-Yong, WANG Hai-Hua   

  1. Institute of Polymer Science, School of Chemisty and Chemical Engineering, Zhongshan University, Guangzhou 510275, China
  • Received:2003-07-08 Online:2004-11-24 Published:2004-11-24

摘要: 制备了α-二亚胺镍()配合物[C6H5—NC(CH3)—C(CH3)N—C6H5]NiBr2(NiL)-TiCl4负载在MgCl2-SiO2载体上的复合催化剂(NiL-TiCl4/MgCl2-SiO2),以AlR3为助催化剂(不用MAO)催化乙烯聚合.研究了NiL和TiCl4负载方法、NiL/TiCl4摩尔比、助催化剂种类及聚合反应温度等对催化剂性能的影响.用IR和13CNMR表征聚合产物支化度及支链结构;用GC-MS监测聚合反应.实验结果表明,NiL-TiCl4复合催化剂具有齐聚原位共聚特性,可催化乙烯原位聚合,合成支化聚乙烯.

关键词: &alpha, -二亚胺镍()-TiCl4复合催化剂, 乙烯聚合, 原位共聚合, 支化聚乙烯

Abstract: The (α-diimine)nickel(Ⅱ){[C6H5—NC(CH3)—C(CH3)N—C6H5]NiBr2}—TiCl4(abbreviated as NiL-TiCl4) combined catalyst which was supported by the MgCl2-SiO2 carrier was prepared. With alky aluminum(AlR3) as a cocatalyst, in place of methylaluminoxane(MAO), it can catalyze ethylene polymerization and copolymerization in situ. The influences of the procedure for supporting NiL-TiCl4, the molar ratio of NiL to TiCl4, cocatalyst type and polymerization temperature on the catalytic performance were studied. The branching degree and the composition of the branched chain of polymerized product were investigated by IR and 13C NMR spectra. The experiment results show that the combined catalyst can be used to catalyze the synthesis of the branched polyethylene with various banched chains. The polymerization reaction was monitored by gas chromatography and mass spectrometer(GC-MS). The results show that this catalyst has the function to catalyze the oligomerization and copolymerization in situ for ethylene.

Key words: Diimine)nickel(Ⅱ)-TiCl4 combined catalyst, Ethylene polymerization, Copolymerization in situ, Branched polyethylene

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