【摘要】 本文应用氚醇淬灭法和动力学方法测定了NdCl₃-C₂H₅OH-AlR₃-丁二烯聚合体系的活性中心浓度及反应速度常数。结果表明:其活性中心浓度在05-2.8×10^-2mol/mol Nd内变化。固定温度时,在所研究,的范围内,其增长速度常数不随烷基铝种类及其它聚合条件而改变,但对烷基铝链转移速度常数影响显著。更多还原

【Abstract】 The number of active centers and reaction rate constants in the polymerization system of NdCl3-C2H5OH-AlR3-butadiene have been determined by means of tritiated alcohol quenching and kinetic methods. The experimental results show that the number of active centers in this polymerization system lies in the range of 0.5-2.8×10-2mol/ mol Nd with respect to two kinds of aluminium alkyls used. In the investigated range the propagation rate constant does not depend on the nature of AlR3 and polymerization conditions except polymerization temperature, while the rate constant of chain transfer is affected markedly by variations of polymerization conditions.更多还原