摘要
测定了络合Ⅱ型TiCl_3-Al(C_2H_5)_3催化1-辛烯聚合中不同时间的产物分子量分布,用4个Schulz-Flory“最可几”分布函数叠加,较好地拟合了实测分布,从而确定此体系有4种活性中心。从拟合及动力学测定结果确定了4种活性中心的聚合速率、浓度及链增长速率常数、链转移速率常数等,讨论了各活性中心的结构及聚合机理。
The molecular-weight distribution (MWD) of polyoctene-1 synthesized by Complex- II TiCl3-AlEt3 catalyst was determined, and the MWD curves were precisely fitted by four Schulz-Flory 'most probable' distributions with different parameters, indicating the pres-ence of four kinds of active center in the studied system. By using of the results of MWD analysis and polymerization kinetics measurements, Rp, [C* ], kp, ktr and other parameters of the four kinds of active center were determined. The structures of the active centers and the polymerization mechanism are discussed.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第1期137-140,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
Z-N催化剂
活性中心
多分散性
Ziegler-Natta catalyst, Active center, Plurality, Kinetic parameters
