Controlled grafting of cationic poly[(ar-vinylbenzyl)trimethylammonium chloride] on hydrogen-terminated silicon substrate by surface-initiated RAFT polymerization


DEMİRCİ S., ÇAYKARA T.

REACTIVE & FUNCTIONAL POLYMERS, vol.72, no.9, pp.588-595, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 72 Issue: 9
  • Publication Date: 2012
  • Doi Number: 10.1016/j.reactfunctpolym.2012.06.005
  • Journal Name: REACTIVE & FUNCTIONAL POLYMERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.588-595
  • Keywords: Surface-initiated RAFT polymerization, Cationic polymer brushes, Grafting density, Wettability, Surface morphology, TRANSFER RADICAL POLYMERIZATION, MOLECULAR-WEIGHT, POLY(N-ISOPROPYLACRYLAMIDE) BRUSHES, FUNCTIONALIZATION, DENSITY, STYRENE, AGENT, WAFER
  • Gazi University Affiliated: Yes

Abstract

Controlled grafting of well-defined cationic poly[(ar-vinylbenzyl)trimethylammonium chloride] [poly (VBTAC)] brushes on a hydrogen-terminated silicon substrate (Si-H) was performed via surface-initiated RAFT polymerization. The azo-initiator was immobilized on the Si-H surface via a three step process involving (i) coupling of the t-butyloxycarbonyl (t-BOC) protected allylamine to the Si-H surface under UV irradiation, (ii) conversion of the t-BOC protected allylamine groups into the free amine groups by trifluoroacetic acid, and (iii) the amide reaction of allylamine with the 4,4'-azobis(4-cyanopentanoyl chloride) initiator. The living polymerization produced silicon substrate coated with well-defined cationic poly(VBTAC) with a target molecular weight and a grafting density as high as 0.93 chains/nm(2). (C) 2012 Elsevier Ltd. All rights reserved.