以卤代苯酚为原料,在咪唑和4-二甲氨基吡啶存在下,与三乙基氯硅烷反应,得到酚氧邻位为三乙基硅基取代的取代苯酚,随后与多聚甲醛反应,得到取代水杨醛,与伯胺通过醛胺缩合,得到苯氧亚胺配体,最后与金属络合,得到两种含三乙基硅基的苯氧...以卤代苯酚为原料,在咪唑和4-二甲氨基吡啶存在下,与三乙基氯硅烷反应,得到酚氧邻位为三乙基硅基取代的取代苯酚,随后与多聚甲醛反应,得到取代水杨醛,与伯胺通过醛胺缩合,得到苯氧亚胺配体,最后与金属络合,得到两种含三乙基硅基的苯氧亚胺锆催化剂,用于催化乙烯聚合制备超高分子量聚乙烯。在聚合温度为70℃,乙烯压力1.0 MPa,n(Al)/n(Zr)=7000条件下,以甲苯为溶剂,催化剂j的催化活性可达8.45 kg PE/(mmol·Zr·h),所得聚乙烯的黏均分子量介于100×104~800×104 g/mol,其熔点139℃,结晶度49.7%。展开更多
以硅胶、甲基铝氧烷、茂金属络合物为原料制备了两种硅胶负载型金属络合物M1和M2,评价了催化乙烯聚合性能,研究了催化聚合动力学,对树脂力学性能进行表征。结果表明,催化乙烯聚合活性为2250~13800 g PE/g Cat,树脂黏均分子量为21×1...以硅胶、甲基铝氧烷、茂金属络合物为原料制备了两种硅胶负载型金属络合物M1和M2,评价了催化乙烯聚合性能,研究了催化聚合动力学,对树脂力学性能进行表征。结果表明,催化乙烯聚合活性为2250~13800 g PE/g Cat,树脂黏均分子量为21×10^(4)~48×10^(4)g/mol。M1催化乙烯聚合动力学活性释放平稳、衰减缓慢,M2呈现出活性快速释放、衰减较快的特点。随着树脂分子量下降,冲击强度、拉伸强度均降低,断裂伸长率上升。展开更多
A series of alkylaluminoxanes(TEAO, BTEAO, TAAO and BEBAO) were synthesized by hydrolysis of aluminium alkyls and modified with para-fluorophenylboric acid. Their cocatalytic performances, especially their effects on ...A series of alkylaluminoxanes(TEAO, BTEAO, TAAO and BEBAO) were synthesized by hydrolysis of aluminium alkyls and modified with para-fluorophenylboric acid. Their cocatalytic performances, especially their effects on molecular weight and molecular weight distribution of polyethylene catalyzed by{ 2C 5H 3N}FeCl 2(Ar=2,6-diisopropylphenyl) (1) were studied. Under the action of iron-based catalyst together with all of the four alkylaluminoxanes linear high-density polyethylene with broad or bimodal molecular weight distribution was formed, and the molecular weight and molecular weight distribution of polyethylene could be adjusted to some extent by changing n(Al)/n(Fe) ratios and architecture of aluminoxanes.展开更多
文摘以卤代苯酚为原料,在咪唑和4-二甲氨基吡啶存在下,与三乙基氯硅烷反应,得到酚氧邻位为三乙基硅基取代的取代苯酚,随后与多聚甲醛反应,得到取代水杨醛,与伯胺通过醛胺缩合,得到苯氧亚胺配体,最后与金属络合,得到两种含三乙基硅基的苯氧亚胺锆催化剂,用于催化乙烯聚合制备超高分子量聚乙烯。在聚合温度为70℃,乙烯压力1.0 MPa,n(Al)/n(Zr)=7000条件下,以甲苯为溶剂,催化剂j的催化活性可达8.45 kg PE/(mmol·Zr·h),所得聚乙烯的黏均分子量介于100×104~800×104 g/mol,其熔点139℃,结晶度49.7%。
文摘以硅胶、甲基铝氧烷、茂金属络合物为原料制备了两种硅胶负载型金属络合物M1和M2,评价了催化乙烯聚合性能,研究了催化聚合动力学,对树脂力学性能进行表征。结果表明,催化乙烯聚合活性为2250~13800 g PE/g Cat,树脂黏均分子量为21×10^(4)~48×10^(4)g/mol。M1催化乙烯聚合动力学活性释放平稳、衰减缓慢,M2呈现出活性快速释放、衰减较快的特点。随着树脂分子量下降,冲击强度、拉伸强度均降低,断裂伸长率上升。
文摘A series of alkylaluminoxanes(TEAO, BTEAO, TAAO and BEBAO) were synthesized by hydrolysis of aluminium alkyls and modified with para-fluorophenylboric acid. Their cocatalytic performances, especially their effects on molecular weight and molecular weight distribution of polyethylene catalyzed by{ 2C 5H 3N}FeCl 2(Ar=2,6-diisopropylphenyl) (1) were studied. Under the action of iron-based catalyst together with all of the four alkylaluminoxanes linear high-density polyethylene with broad or bimodal molecular weight distribution was formed, and the molecular weight and molecular weight distribution of polyethylene could be adjusted to some extent by changing n(Al)/n(Fe) ratios and architecture of aluminoxanes.