Degradation of polymer coating systems studied by positron annihilation spectroscopy. 1. UV irradiation effect

Cao, H. ; Zhang, Renwu ; Sundar, C. S. ; Yuan, Jen-Pwu ; He, Y. ; Sandreczki, T. C. ; Jean, Y. C. ; Nielsen, B. (1998) Degradation of polymer coating systems studied by positron annihilation spectroscopy. 1. UV irradiation effect Macromolecules, 31 (19). pp. 6627-6635. ISSN 0024-9297

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ma9802778

Related URL: http://dx.doi.org/10.1021/ma9802778

Abstract

The degradation of polymer coating systems due to UV irradiation is studied using positron annihilation spectroscopy. Doppler broadened spectra of positron annihilation are measured as a function of slow positron implantation energy in a series of polymer coating systems which were exposed to UV irradiation for up to 2000 h. The S parameters from the Doppler broadened energy spectra vs positron energy show an increase at very low positron energy (<575 eV) and then a decrease to about 8 keV, followed by a slight increase up to 50 keV. The UV irradiation systematically decreases the S parameter as a function of exposure duration. The significant S parameter decrease is interpreted as the degradation of polymers and the change of the sub-nanometer defect profiles due to UV irradiation. These interpretations are supported by the data from the atomic force microscope, UV absorption, Fourier transform infrared, and profilometry measurements.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:53215
Deposited On:05 Aug 2011 10:35
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