A new selenium-based RAFT agent for surface-initiated RAFT polymerization of 4-vinylpyridine


DEMİRCİ S., Kinali-Demirci S., ÇAYKARA T.

POLYMER, vol.54, no.20, pp.5345-5350, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 20
  • Publication Date: 2013
  • Doi Number: 10.1016/j.polymer.2013.07.060
  • Journal Name: POLYMER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.5345-5350
  • Keywords: Selenium, Polymer brushes, RAFT polymerization, SILICON-WAFER, RADICAL POLYMERIZATION, COPOLYMER BRUSHES, CLICK CHEMISTRY, STYRENE, GROWTH, ACID
  • Gazi University Affiliated: Yes

Abstract

A new selenium-based reversible addition-fragmentation chain transfer (RAFT) agent, 4-cyanopentanoic acid diselenobenzoate (RAFT-Se), was synthesized and utilized in the surface-initiated RAFT polymerization of 4-vinylpyridine (4VP) on silicon substrate. The results indicate that the RAFT-Se can control the surface-initiated RAFT polymerization, as evidenced by the number-average molecular weight that increase linearly with monomer conversion, molecular weights that agreed well with the predicted values, and the relatively low polydispersity indexes. The surface-initiated RAFT polymerization with the RAFT-Se was the same polymerization mechanism as its analog, 4-cyanopentanoic acid dithiobenzoate (RAFT-S). The grafting density of the poly(4-vinylpyridine) brushes prepared in the presence of RAFT-Se (sigma(RAFT-Se)) and RAFT-S (sigma(RAFT-S)) was estimated to be about 0.51 and 0.66 chains/nm(2), respectively. In addition, the end of polymer chains on silicon substrate contains selenium element which may be useful in biosensor applications. (c) 2013 Elsevier Ltd. All rights reserved.