Introduction of quaternary amines onto a film surface by graft polymerization

✍ Scribed by Emiko Uchida; Yoshito Ikada

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 613 KB
• Volume: 61
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960822)61:8<1365::aid-app18>3.0.co;2-y

✦ Synopsis

Quaternary amines were introduced onto a poly(ethy1ene terephthalate) (PET) film surface by two different methods using UV-induced graft polymerization. The first involves a twostep reaction: graft polymerization of N,N'-(dimethy1amino)ethyl methacrylate (DMAEMA) onto the P E T film, followed by quaternization of the tertiary N,N'-dimethylamino groups of grafted chains using alkyl bromides (R,Br). The second is direct graft polymerization of DMAEMA having pendant quaternary amines onto the P E T film. The alkyl bromides used for quaternization of the monomers and graft chains include: n-propyl, n-butyl, noctyl, 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 R3Br 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* when the monomer quaternized with R3Br was used for the graft polymerization in the presence of 1 X 10-3M sodium metaperiodate. The carbon number of alkyl chains in the quaternary amines estimated from XPS spectra was in good agreement with that of R,Br used for quaternization. 0 1996