摘要
在惰性气氛下,用2 mol甲基锂处理二(1,2-二苯基-4-甲基环戊二烯基)二氯化锆,合成了大立体位阻的二甲基二茂锆化合物[(1,2-Ph2-4-M eCp)2ZrM e2].经元素分析、核磁共振氢谱、碳谱和X射线晶体衍射分析,确定了该化合物的结构.经A l(iBu)3/Ph3C+B(C6F5)4-活化,该化合物催化乙烯聚合反应显示出较高的催化活性,生成高分子量及高熔点聚乙烯.该体系的特点是在较低的n(A l)/n(Zr)比下即可有效地催化乙烯聚合.
A new dialkylzirconocene type of complex, (1,2-ph2-4-MeCp)2ZrMe2 (2), was synthesized by reaction of (1,2-Ph2-4-MeCp)2ZrCl2 (1) and with 2 equivalent of methyl lithium at -78℃. Complex 2 was charcterized by elemental analysis, ^1H NMR and ^13C NMR. The structure of complex 2 was determined by single crystal X-ray structural analysis. Upon activation with Al(^iBu)3/Ph3C^+ B(C6F5)f , complex 2 showed a high catalytic activity for the ethylene polymerization reaction at lower n(Al)/n(Zr) ratios and high molecular weight polyethylene samples with high melting transition temperatures were produced. The polyethylene samples were characterized by molecular weight determination, DSC and XRD analysis.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期375-379,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20374023)资助
关键词
茂金属催化剂
茂锆化合物
乙烯聚合
烯烃聚合
均相催化
Metallocene catalyst
Zirconocene
Ethylene polymerization
Olefin polymerization
Homogeneous catalysis