This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on February 1, 1996. The length of the article is 2994 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: A novel nondestructive diagnosis using optical reflective analysis is proposed to evaluate thermally aged opaque insulating resins. Values of reflective absorbance ([A.sub.R]) in the visible to near infrared (IR) range were measured under a variety of aging conditions using the bisphenol-A type epoxy resin tapes containing iron oxide pigment. The [A.sub.R] values increased markedly over 180 [degrees] C before and after heating. This increase was due to the electronic transition absorption caused by thermal oxidation of the resin. By rescaling the aging time as a reduced time, a master curve to evaluate thermal aging of the resin was obtained. Furthermore, a similar curve was obtained using the difference ([Delta][A.sub.R]) of the [A.sub.R] values between two wavelengths in the near IR range. This indicated that the surface reflectivity dependence on raggedness and dust and stain could be reduced. Consequently, when the thermal stress was the main cause of aging, the aging and residual life of the resin could be evaluated using this method.
Citation Details
Title: Nondestructive diagnosis of thermal aging for opaque epoxy resin by optical reflective analysis.
Author: Yoshitaka Takezawa
Publication: Polymer Engineering and Science (Refereed)
Date: February 1, 1996
Publisher: Society of Plastics Engineers, Inc.
Volume: v36 Issue: n4 Page: p586(6)
Distributed by Thomson Gale
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