pH-Responsive Random Copolymer Films with Amine Side Chains

Autor:	Zulkifli Ibrahim, G. Kane Jennings, Dongshun Bai
Rok vydání:	2006
Předmět:	Chemistry Diazomethane Ether Surfaces Coatings and Films Electronic Optical and Magnetic Materials Hydrolysis chemistry.chemical_compound General Energy Ethyl diazoacetate Polymer chemistry Copolymer Side chain Amine gas treating Physical and Theoretical Chemistry Dimethylamine
Zdroj:	The Journal of Physical Chemistry C. 111:461-466
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp064936r
Popis:	We have designed pH-responsive copolymer films that consist of polymethylene (PM) with dilute randomly distributed side chains terminated with dimethylamine groups. The films are grown on gold surfaces by (1) exposure to an ether solution of diazomethane and ethyl diazoacetate to produce a random copolymer Au-[(CH2)A-(CHCO2Et)B] (denoted as PM-CO2Et, A ≫ B), (2) hydrolysis of the ester groups to carboxylic acids (PM-CO2H), (3) complete conversion of the acids to acid chlorides (PM-COCl), and (4) quantitative reaction of the acid chlorides with N,N-dimethylethylenediamine (DMEDA) to yield a film (PM-CONHR, R represents −-CH2CH2N(CH3)2) with amide-linked, amine-terminated side groups that are pH active. The effect of polymer composition on pH response was investigated by electrochemical impedance spectroscopy (EIS). PM-CONHR films are more hydrophilic in their uncharged state than PM-CO2H films and thereby exhibit lower resistance against ion transfer. When the pH is decreased, the amine groups become proto...
Databáze:	OpenAIRE
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