烷基鋁化合物

1859年,Hallwachs在試驗室中製得了有機鋁化合物,一直到1924年Grignard才分離和鑑定出這些化合物。后來Grosse等進行了一系列的有機鋁化合物的製備研究,至今仍是最詳盡的文獻之一。但總的看來,在有機金屬化合物中,有機鋁化合物過去是研究得很少的一個,也沒有什麼應用。     

络合型催化剂丙烯聚合动力学研究

本工作对络合型(Solvay型)TiCl_3催化剂—(C_2H_5)_2AlCl体系丙烯聚合进行了活性中心浓度C_p、链增长速率常数k_p和链增长活化能E_p等的测定,并与常规TiCl_3·0.33AlCl_3进行了比较,C_p以动力学方法求取,数均分子量以粘度法测定经分子量分布校正,结果表明,络合型催化剂活性比常规催化剂高,不仅是由于C_p增高,在更大程度上是由于k_p提高。     

KINETIC STUDY OF GAS-PHASE POLYMERIZATION OF PROPENE BY THE INHIBITION METHOD USING CARBON MONOXIDE

The inhibition method using CO to determine the active center concentration C~* in olefin poly-merization and the kinetics of gas-phase polymerization of propene were studied. The reliabilityof the method when used in gas-phase polymerization of propene is proved and the influencing fac-tor of the method is found to be the "repeating inhibition" of CO to the active centers. The C~*, the rate constant k_P and the activation energy were determined from the experimentalresults. We concluded that the C~* decreases with polymerization time and coincides with the decayrate of the polymerization.     

STUDIES ON THE KINETICS OF PROPYLENE POLYMERIZATION WITH THE COMPLEXTYPE TiCl_3 CATALYST

The active center concentration C_p, the rate constant k_p, and the activation energy of chain propagation E_p in the polymerization of propylene with complex-type TiCl_3-(C_2H_5)_2AlCl catalyst system were studied. The Mn was corrected by (?) value determined by GPC. The values thus obtained for C_p, k_p, and E_p at 50℃were 3.01 mol/mol Ti, 6.27 1/mol·sec, and 5.10 Kcal/mol respectively.The kinetic parameters were compared with those obtained from conventional TiCl_3·AlCl_2 catalyst, showing that the higher activity of the complex-type catalyst over the conventional catalyst is not only due to the higher C_p of the former, but to a greater extent due to the increase of the k_p value.     

乙烯烃類的聚合新方法

不飽和煙類及其衍生物的聚合引起研究工作者們的注意已有好幾十年,而且國內外已發表了許多專論和幾百篇研究報告。聚合過程是作為製造這些國民經濟重要物,例如合成橡膠、塑料、合成纖維、潤滑油添加劑等的基礎。最近幾年來,氣態不飽和煙聚合的固體物,特別是聚乙烯——乙烯的聚合物——具有巨大的意義。由於聚乙烯的特性,在許多新型高分子化合物     

用一氧化碳阻聚法对丙烯气相聚合动力学的研究

本文研究了一种新的烯烃聚合活性中心浓度测定方法,即CO阻聚法,并在此基础上测定了络合型催化剂丙烯气相聚合的活性中心浓度、链增长速度常数及活化能;证实了该方法用于丙烯气相聚合的可靠性及其主要影响因素是CO对活性中心的“多次阻聚”,同时从实验上证明丙烯聚合速度衰减是由于活性中心浓度降低。