THE EFFECT OF THE CHAIN STRUCTURE OF CARBOXY- LATED POLYPROPYLENE CARRIER ON THE POLYMERIZATION OF ACRYLONITRILE
羧化聚丙烯载体的链结构对丙烯腈聚合的影响

The effect of the chain structure of carboxylated polypropylene carrier (polypropylene grafted with unsaturated carboxylic acid) on the polymerization rate of acrylonitrile was investigated. The comparison on the initiation activity of vanadyl polycarboxylate (polymer supported catalyst) with vanadyl iso-butyrate (low molecular homologue) and vanadyl sulfa-te (low molecular non-homologue) was made. The experimental results indicated that (1) the cooperation effect exists between the carboxyl groups of (P-COO)2 VO; (2) the chain effect of carrier enhances the cooperation effect of carboxyl groups; (3) the polymerization rate was affected by the d-1-configuration of the chains of polycarboxylic acid, the distance of carboxyl groups and the mass transfer effect of carrier and (4) under our experimental conditions, the mechanism of initiation does not depend upon the chain structure of polymer supporters.