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Allyl chloride/AIC1 3 /ether cationic initiating systems for polymerization of 1,3‐pentadiene
Author(s) -
Yuan Wu.,
Liu JiaLin,
Zhang WenChuan
Publication year - 1999
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19990170416
Subject(s) - chemistry , carbocation , cationic polymerization , polymerization , nucleophile , reactivity (psychology) , ether , steric effects , polymer chemistry , chloride , polymer , yield (engineering) , photochemistry , allyl chloride , organic chemistry , catalysis , medicine , materials science , alternative medicine , pathology , metallurgy
Various ethers were used to mediate the polymerization of 1,3‐pentadiene (PD) initiated by AlCl 3 and by allyl chloride (AllyCl)/AlCl 3 . The introduction of the ethers exert considerable effects on polymer yield and molecular weight due to its interaction with the propagating carbocation. The carbocation reactivity is reduced by this interaction which is subject to the ether's nucleophilicity determined by the steric hindrance of groups adjacent to oxygen. The reduction of carbocation reactivity gives rise to a decrease of polymer yield owing to inhibition of propagation but results in an augmentation of molecular weight due to suppression of various side reactions such as terminations. By using suitably nucleophilic ethers such as diphenyl ether, the polymerization can be mediated to give an high molecular weight polymer in high yield.