【摘要】 以4-叔丁基苯酚为原料，通过改变羟基邻位取代基经过溴甲基化、亲核取代以及金属络合反应得到了4种三齿[OSO]双酚钛络合催化剂[S（2-CH₂-4-^tBu-6-R-C₆H₂O）₂]TiCl₂（R₁=CMe₃,R₂=CPhMe₂,R₃=CPh₂Me, R₄=CPh₃）。在温度30,50,70℃,压力0.6 MPa的条件下探讨乙烯聚合反应性能，通过改变催化剂的Al/Ti比和反应时间，得到不同条件下的聚烯烃产物，并利用凝胶色谱（GPC）对产物进行表征分析。对不同反应条件下的这4种催化剂进行比较，由于R基团位阻效应的影响，位阻越大催化剂的活性越高，结合实验结果得出，在50℃条件下[S（2-CH₂-4-^tBu-6-CMePh₂-C₆H₂O）₂]TiCl₂催化剂的活性最高，为6.7×10⁶ g PE/（mol Ti·h）以及得到的聚烯烃产品M_W为1.68×10⁵,分子量分布为3.2。更多还原

【Abstract】 Four kinds of tridentate[OSO]bisphenol titanium complex catalysts[S（2-CH₂-4-^tBu-6-R-C₆H₂O）₂]TiCl₂（R₁=CMe₃,R₂=CPhMe₂,R₃=CPh₂Me, R₄=CPh₃） were prepared from 4-tert-butyl phenol through bromination, nucleophilic substitution and metal complexation reaction by changing the ortho-substituent of hydroxyl.The reaction performance of ethylene polymerization was investigated under the conditions of 30,50,70 ℃,and pressure of 0.6 MPa.Polyolefin products under different conditions were obtained by changing the Al/Ti ratio of the catalyst and the reaction time.The products were characterized and analyzed by gel chromatogram phy（GPC）.The four catalysts under different reaction conditions were compared.Due to the effect of R group steric hindrance, the larger the steric hindrance, the higher the activity of the catalyst.Based on the experimental results, it was concluded that the activity of the[S（2-CH₂-4-^tBu-6-CMePh₂-C₆H₂O）₂]TiCl₂ catalyst at 50 ℃ was up to 6.7×10⁶ g PE/（mol Ti·h）,and the obtained polyolefin product M_W was 1.68×10⁵,with a molecular weight distribution of 3.2.更多还原