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Introduction of quaternary amines onto a film surface by graft polymerization
Author(s) -
Uchida Emiko,
Ikada Yoshito
Publication year - 1996
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/(sici)1097-4628(19960822)61:8<1365::aid-app18>3.0.co;2-y
Subject(s) - polymer chemistry , alkyl , polymerization , monomer , chemistry , bromide , methacrylate , amine gas treating , tertiary amine , ethylene , organic chemistry , polymer , catalysis
Quaternary amines were introduced onto a poly(ethylene terephthalate) (PET) film surface by two different methods using UV‐induced graft polymerization. The first involves a two‐step reaction: graft polymerization of N,N′ ‐(dimethylamino)ethyl methacrylate (DMAEMA) onto the PET film, followed by quaternization of the tertiary N,N′ ‐dimethylamino groups of grafted chains using alkyl bromides (R n Br). The second is direct graft polymerization of DMAEMA having pendant quaternary amines onto the PET film. The alkyl bromides used for quaternization of the monomers and graft chains include: n ‐propyl, n ‐butyl, n ‐octyl, n ‐lauryl, and n ‐cetyl bromide. The two‐step method could quaternarize 90% of the pendant N,N′ ‐dimethylamino groups of the graft chains when R 3 Br was used. The extent of quaternization decreased with the increasing carbon number of alkyl bromide. The direct one‐step method gave a graft amine density of 8 nmol/cm 2 when the monomer quaternized with R 3 Br was used for the graft polymerization in the presence of 1 X 10 ‐3 M sodium metaperiodate. The carbon number of alkyl chains in the quaternary amines estimated from XPS spectra was in good agreement with that of R n Br used for quaternization. © 1996 John Wiley & Sons, Inc.