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Grafting of N,N-dimethylacrylamide onto silk fibers via a RAFT agent controlled radical transformation process

Grafting of N,N-dimethylacrylamide onto silk fibers via a RAFT agent controlled radical... Abstract RAFT-mediated silk graft copolymerizations with DMAAm (N,N-Dimethylacrylamide) were studied. Three types of macromolecular RAFT agents which released different R group radicals, namely, polyacrylic acid-b-polystyrene radical (PAA-b-PSt•), polyacrylic acid-b-polybutyl acrylate radical (PAA-b-PBA•) and polystyrene-b-polyacrylic acid radical (PSt-b-PAA•), were chosen as the transfer agents. During the graft copolymerizations, the newly born PAA-b-PSt• in the aqueous phase enhanced the formation of silk macroradicals, consequently accelerated the copolymerization rate and improved monomer grafting efficiency (Ge) greatly. The Ge was less improved when the RAFT agent capable of producing PAA-b-PBA• were substituted for the one producing PAA-b-PSt•. In addition, Ge also benefited from an increase in the chain length of PSt block in PAA-b-PSt•, as well as PBA block in PAA-b-PBA•. However, the addition of RAFT agent giving rise to PSt-b-PAA• had negligible effects on Ge. The reasons were ascribed to both the radical reactivity and capacity of radical adsorption onto silk fibers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

Grafting of N,N-dimethylacrylamide onto silk fibers via a RAFT agent controlled radical transformation process

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References (34)

Publisher
Springer Journals
Copyright
2013 The Korean Fiber Society and Springer Science+Business Media Dordrecht
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/s12221-013-0875-z
Publisher site
See Article on Publisher Site

Abstract

Abstract RAFT-mediated silk graft copolymerizations with DMAAm (N,N-Dimethylacrylamide) were studied. Three types of macromolecular RAFT agents which released different R group radicals, namely, polyacrylic acid-b-polystyrene radical (PAA-b-PSt•), polyacrylic acid-b-polybutyl acrylate radical (PAA-b-PBA•) and polystyrene-b-polyacrylic acid radical (PSt-b-PAA•), were chosen as the transfer agents. During the graft copolymerizations, the newly born PAA-b-PSt• in the aqueous phase enhanced the formation of silk macroradicals, consequently accelerated the copolymerization rate and improved monomer grafting efficiency (Ge) greatly. The Ge was less improved when the RAFT agent capable of producing PAA-b-PBA• were substituted for the one producing PAA-b-PSt•. In addition, Ge also benefited from an increase in the chain length of PSt block in PAA-b-PSt•, as well as PBA block in PAA-b-PBA•. However, the addition of RAFT agent giving rise to PSt-b-PAA• had negligible effects on Ge. The reasons were ascribed to both the radical reactivity and capacity of radical adsorption onto silk fibers.

Journal

Fibers and PolymersSpringer Journals

Published: Jun 1, 2013

Keywords: Polymer Sciences

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