The eationic polymerization of 1, 3-pentadiene (PD) initiated by A1C13 inn-hexane was carried out. Effects of arenes, alkyl halides and ethers on the gel formation resulting from crosslinking reaction were investigate...The eationic polymerization of 1, 3-pentadiene (PD) initiated by A1C13 inn-hexane was carried out. Effects of arenes, alkyl halides and ethers on the gel formation resulting from crosslinking reaction were investigated. The crosslinking was reduced by various arenes through a chain transfer mechanism. Alkyl halides such asrert-butyl chloride and allyl chloride could complex with AlCl3 to generate an initiating system giving rise to a gel-free polymerization, while benzyl chloride reduced the formation of gel by chain transfer. Ethers exerted two effects on the polymerization system: giving a complex initiating system with AlCl3 to produce a relatively high molecular weight polymer, or reducing crosslinking by lowering activity of carbocations.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 29504032)
文摘The eationic polymerization of 1, 3-pentadiene (PD) initiated by A1C13 inn-hexane was carried out. Effects of arenes, alkyl halides and ethers on the gel formation resulting from crosslinking reaction were investigated. The crosslinking was reduced by various arenes through a chain transfer mechanism. Alkyl halides such asrert-butyl chloride and allyl chloride could complex with AlCl3 to generate an initiating system giving rise to a gel-free polymerization, while benzyl chloride reduced the formation of gel by chain transfer. Ethers exerted two effects on the polymerization system: giving a complex initiating system with AlCl3 to produce a relatively high molecular weight polymer, or reducing crosslinking by lowering activity of carbocations.