新型不对称双核茂金属钛催化剂催化乙烯聚合

Ethylene polymerization by novel asymmetric dinuclear titanium metallocene complexes

为了提高茂金属聚乙烯的相对分子质量分布(MWD),使用schlenk技术合成了两个新型的乙醚桥不对称双核钛茂金属催化剂:(CpTiCl2)2[η5-η5-C9H6(CH2)2O(CH2)2C5H4](Cl)和(CpTiCl2)2[η5-η5-C9H6(CH2)2O(CH2)2C5H3CH3](C2).并以GC-MS1、H-13C-NMR和IR对配体和配合物进行了表征.以甲基铝氧烷(MAO)为助催化剂,C1/MAO和C2/MAO催化体系均能有效地催化乙烯聚合,最高活性分别可达4.43×105g/(mol.h)和4.82×105g/(mol.h),所得聚乙烯黏均相对分子质量最高分别可达7.52×105和7.15×105,所得聚乙烯的相对分子质量分布分别高达12.4和11.00.

For improving the molecular weight distribution（MWD） of metallocene polyethylene（PE）,two new asymmetric ethyl_ether bridged dinuclear titanium metallocene complexes：（CpTiCl2）2[η^5-η^5-C9H6（CH2）2O（CH2）2C5H4]（C1） and（CpTiCl2）2[η^5-η^5-C9H6（CH2）2 O（CH2）2C5H3 CH3]（C2）,have been synthesized by using Schlenk technology,and they were characterized with GCMS,^1H-^13C-NMR and IR.After activation with methy aluminoxane（MAO）,C1 and C2 are efficient catalytic systems for ethylene polymerization.At the atmosphere pressure,their catalytic activities reached to 4.43×10^5 g/（mol·h） and 4.82×10^5 g/（mol·h）,the Mη of PE reached to 7.52×10^5 and 7.15×10^5,and the MWD of PE were 12.4 and 11.00,respectively.