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In situ preparation of N , N ‐dimethyl‐ n ‐butylamine for 2,6‐dimethylphenol polymerization
Author(s) -
Li KuoTseng,
Lin ChenChin
Publication year - 1995
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.1995.070580713
Subject(s) - polymerization , catalysis , butylamine , chemistry , reagent , polymer chemistry , dmba , nuclear chemistry , organic chemistry , amine gas treating , polymer , carcinogenesis , biochemistry , gene
2,6‐Dimethylphenol (2,6‐DMP) polymerization with a catalytic complex of Cu 2 O/HBr/ N , N '‐di‐ tert ‐butylethylene diamine (DBEDA)/ N , N ‐dimethyl‐ n ‐butylamine (DMBA)/dibutylamine (DBA) was studied, in which DMBA was prepared in situ from the methylation of n ‐butylamine over four different solid acid catalysts (two different γ‐alumina, one silica‐alumina, and one zeolite). The effectiveness of the unpurified methylation product solutions for promoting the 2,6‐DMP polymerization was strongly dependent on the type of solid acid catalysts used. The performance of the best one (untreated product solution from the methylation reactor with Condea γ‐alumina catalyst) was very similiar to that of the reagent grade DMBA. Infrared spectrum studies showed that DMBA acted as the external base for the 2,6‐DMP polymerization catalyst system to neutralize the excess hydrobromic acid and to increase the polymerization rate. © 1995 John Wiley & Sons, Inc.