Photoinduced polymerization of thiophene using iodonium salt

Yagci Y., Yilmaz F., Kiralp S., Toppare L.

MACROMOLECULAR CHEMISTRY AND PHYSICS, vol.206, no.12, pp.1178-1182, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 206 Issue: 12
  • Publication Date: 2005
  • Doi Number: 10.1002/macp.200500084
  • Journal Name: MACROMOLECULAR CHEMISTRY AND PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1178-1182
  • Keywords: conducting polymers, electron transfer, onium salts, photopolymerization, polythiophene, radical cations, CATIONIC-POLYMERIZATION, DIARYLIODONIUM SALTS, PYRIDINIUM, COPOLYMERS, POLYMERS, SYSTEMS, PHOTOINITIATORS, INITIATORS, PYRROLE
  • Middle East Technical University Affiliated: Yes

Abstract

Thiophene was polymerized by means of UVirradiation using diphenyliodonium hexafluorophosphate as a photoinitiator. An initiation mechanism involving electron transfer from photochemically generated onium radical cations to thiophene was proposed. N-Ethoxy-2-methylpyridinium hexafluorophosphate and triphenylsulfonium hexafluorophosphate were also found to be effective in facilitating the polymerization of thiophene. Polymerization is accompanied with the film formation on the surface of the reaction tube. The photochemically obtained polymers were characterized by FT-IR, DSC, and SEM analyses and compared with those obtained by oxidative and electrochemical means. Electrical conductivities of the samples were measured by four-probe technique.