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6668614 
Journal Article 
Surface-initiated single-electron transfer reversible addition-fragmentation chain transfer polymerization of 2-hydroxyethyl acrylamide on silicon substrate at ambient temperature 
Yucel, FM; Yildirim, E; Caykara, T; , 
2019 
Yes 
Journal of Polymer Science. Part A, Polymer Chemistry
ISSN: 0887-624X
EISSN: 1099-0518 
WILEY 
HOBOKEN 
1140-1146 
WOS:000467061300012 
2-Hydroxyethyl acrylamide was successfully polymerized via single-electron transfer initiation on the silicon surface and propagation through the reversible addition-fragmentation chain transfer (SET-RAFT) polymerization at ambient temperature for different polymerization times. This work is the first time application of the surface-initiated SET-RAFT mechanism to afford the preparation of well-defined poly(2-hydroxyethyl acrylamide) [poly(HEAAm)] brushes at ambient temperature. The polymerization was well controlled and produced poly(HEAAm) brushes on the silicon surface with a well-defined target molecular weight. The controlled nature of the polymerization was further demonstrated in the presence of sulfur atoms at the chain ends in X-ray photoelectron spectroscopy experiments. The grafting density (sigma, chains nm(-2)) and the average distance between grafting points (D, nm) were found to be 0.42 chains nm(-2) and 1.74nm, respectively, indicating moderate grafting density. (c) 2019 Wiley Periodicals, Inc.