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International Journal of Polymer Science
Volume 2011, Article ID 301807, 7 pages
http://dx.doi.org/10.1155/2011/301807
Research Article

Preirradiation Graft Polymerization of Styrene in a Poly(tetrafluoroethylene) Film Investigated by Time-Resolved Small-Angle Neutron Scattering

1Quantum Beam Science Directorate, Japan Atomic Energy Agency, Ibaraki, Tokai 319-1195, Japan
2Quantum Beam Science Directorate, Japan Atomic Energy Agency, Gunma, Takasaki 370-1292, Japan

Received 18 January 2011; Revised 3 May 2011; Accepted 1 June 2011

Academic Editor: Wen Fu Lee

Copyright © 2011 Hiroki Iwase et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Preirradiation graft polymerization of styrene in a poly(tetrafluoroethylene) (PTFE) film was examined by time-resolved small-angle neutron scattering (SANS). A crosslinked PTFE film, thickness of which is about 50 μm, was irradiated by γ-ray and immersed in a mixed solvent of styrene monomer and toluene. SANS elucidated that graft polymerization proceeds by two reaction processes (I) and (II). In process (I) at 0 < 𝑡 < 2 0 0  min, graft polymerization occurs at an interface between crystalline and amorphous PTFE domains and the grafted polystyrene segregates from PTFE, forming a thin layer with a sharp interface. In process (II) at 2 0 0 < 𝑡 < 6 0 0  min, grafted PS layer starts to bridge between crystalline domains. At the end of process (II), 40% of total crystalline PTFE domain is covered by the grafted PS chains.