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Chemical modification of poly(2,6‐dimethyl‐1,4‐phenylene oxide) by friedel–crafts reactions
Author(s) -
Percec Simona
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330116
Subject(s) - phenylene , friedel–crafts reaction , acylation , steric effects , thermal stability , solubility , oxide , chemical modification , chemistry , polymer chemistry , electrophile , chemical stability , nucleophile , electrophilic substitution , electrophilic aromatic substitution , permeation , organic chemistry , materials science , catalysis , polymer , membrane , biochemistry
The chemical modification of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) by electrophilic sulfonylation and acylation of the aromatic structural units has been investigated. A maximum monosubstitution degree of 79.4 has been reached. Higher substitution levels were difficult to achieve because of both a decrease in the remaining position nucleophilicity and steric hindrances. Minor changes in thermal stability and a broadening of the solubility range of substituted PPO compared with the parent PPO have been recorded. Very good permeation properties to gases, better than for PPO, have been detected for the modified structures.