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Direct Evidence for the Creation of Micropores in UV-Irradiated Poly(Methyl Methacrylate)

Published online by Cambridge University Press:  21 February 2011

J. A. Moore  and
Jin-O Choi
J. A. Moore
Affiliation:
Rensselaer Polytechnic Institute, Polymer Science and Engineering Program, Troy, New York, 12180-3590
Jin-O Choi
Affiliation:
Rensselaer Polytechnic Institute, Polymer Science and Engineering Program, Troy, New York, 12180-3590
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Abstract

Films of PMMA containing azobenzene were prepared by casting from polymer solutions containing the probe or by exposing pre-irradiated films to the vapor of azobenzene. These materials were irradiated at 335 nm and the amount of trans azobenzene which had been photoisomerized was monitored spectrophotometrically. The largest amount of photoisomerization was observed for the pre-irradiated samples which had been penetrated by azobenzene from the vapor, indicating that the created free volume allowed the isomerization to proceed more easily.

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