Synthesis, characterization and thermal degradation of dual temperature- and pH-sensitive RAFT-made copolymers of N,N-(dimethylamino)ethyl methacrylate and methyl methacrylate

Roy, Saswati Ghosh and Bauri, Kamal and Pal, Sunirmal and Goswami, Ankur and Madras, Giridhar and De, Priyadarsi (2013) Synthesis, characterization and thermal degradation of dual temperature- and pH-sensitive RAFT-made copolymers of N,N-(dimethylamino)ethyl methacrylate and methyl methacrylate. In: POLYMER INTERNATIONAL, 62 (3). pp. 463-473.

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Abstract

Poly{(N,N-(dimethylamino)ethyl methacrylate]-co-(methyl methacrylate)} copolymers of various compositions were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization at 70 degrees C in N,N-dimethylformamide. The polymer molecular weights and molecular weight distributions were obtained from size exclusion chromatography, and they indicated the controlled nature of the RAFT polymerizations; the polydispersity indices are in the range 1.11.3. The reactivity ratios of N,N-(dimethylamino)ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA) (rDMAEMA = 0.925 and rMMA = 0.854) were computed by the extended KelenTudos method at high conversions, using compositions obtained from 1H NMR. The pH- and temperature-sensitive behaviour were studied in aqueous solution to confirm dual responsiveness of these copolymers. The thermal properties of the copolymers with various compositions were investigated by differential scanning calorimetry and thermogravimetric analysis. The kinetics of thermal degradation were determined by Friedmann and Chang techniques to evaluate various parameters such as the activation energy, the order and the frequency factor. (c) 2012 Society of Chemical Industry

Item Type:	Journal Article
Publication:	POLYMER INTERNATIONAL
Publisher:	WILEY-BLACKWELL
Additional Information:	Copyright for this article belongs to WILEY-BLACKWELL, USA
Keywords:	copolymerization;reactivity ratio;extended Kelen-Tudos method;thermal degradation
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	15 Mar 2013 05:56
Last Modified:	18 Mar 2013 05:15
URI:	http://eprints.iisc.ac.in/id/eprint/46060

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