中文摘要：

以三乙基铝（AlEt3）改性MgCl2和乙醇（EtOH）的加合物（MgCl2／nEtOH）为载体[MgCl2／AlEtn （OEt）3－n ]负载[OSSO]型桥联双苯氧基二氯化钛（[OSSO]TiCl2），制得乙烯聚合负载型催化剂；使用廉价易得的一氯二乙基铝（AlEt2 Cl）为助催化剂高效催化乙烯聚合，合成了以长支链为主的支化聚乙烯。探讨了MgCl2／AlEtn （OEt）3－n载体的制备工艺、聚合条件对目标催化剂催化乙烯聚合行为以及聚合产物结构的影响。研究表明，负载型催化剂相对[OSSO]TiCl2均相催化剂，催化乙烯聚合具有较高的活性，最高活性可达每106 g（PE）／（mol Ti）·h），比均相催化剂高百倍。13C NMR和DSC分析表明，负载型[OSSO]TiCl2催化剂合成的聚乙烯为以长支链为主的支化聚乙烯，支化度（1000个碳原子中支链的含量）为15，其中长支链含量为60.3％，熔融温度（Tm）为126℃，乙烯聚合反应速率逐渐升高后趋于平稳。

英文摘要：

The [OSSO]-type bis （phenolate）titanium complex （[OSSO]TiCl2 ）was supported by MgCl2/AlEtn （OEt）3-n and then used to efficiently promote the polymerization of ethylene under the acti-vation of the cheap diethylaluminum chloride （AlEt2 Cl ）. The resulted polymer was a long chain branched polyethylene.The influences of the preparation technology of support,triethyl aluminum modif-ying the adduct of MgCl2 and ethyl alcohol （EtOH）（MgCl2/AlEtn （OEt）3-n ）,and the polymerization conditions including polymerization temperature,ethylene press and Al （in AlEt2 Cl）∶Ti on the poly-merization behavior and the polymer structure were explored.The result indicated that the supported cata-lyst could more actively promote the polymerization of ethylene than the homogeneous catalyst with the highest activity of 1 06 g （PE）/（mol（Ti）·h）,which was hundredfold of the homogeneous catalyst.The a-nalysis of the 1 3 C nuclear magnetic resonance spectroscopy confirmed that the obtained polyethylene cata-lyzed by the supported catalyst was the long chain branched polyethylene with a branch number of 1 5 and a long branched chain content of 60.2%.The analysis of differential scanning calorimetry shows that the melting temperature of the branched polyethylene was 1 26 ℃.The kinetics of the ethylene polymerization was steady.