ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
The results of an initial investigation into the monitoring of water absorption and chemicaldegradation in epoxy matrix composites using evanescent wave spectroscopy are presented. Whileconventional silica glasses have too low a refractive index and too short an IR transmission windowto be useful as unclad sensing elements in most resin systems, chalcogenide glasses offer suitablerefractive indices and infrared transmission windows. Arsenic selenide compositions with galliumor tellurium additions were initially investigated as they have been successfully demonstrated inother fibre sensing applications. However their glass transition point lies near or below the curingtemperature for many commercial epoxy resins and thus germanium-antimony-lead sulphide glasseswere also investigated as they display higher glass transition temperatures. The fibres wereembedded in a representative matrix resin by casting samples of epoxy resin around sections offibre. The end faces were prepared to allow an infrared beam to be passed along the fibre and thesamples were subjected to hygrothermal aging. Changes in the transmitted spectra were observed,and photoelasticity was used to monitor the occurrence of fibre fragmentation. Both the arsenicselenide based compositions and the germanium-antimony-lead sulphide compositions displayedminimal bonding with the epoxy resin, so a simple silane treatment was used to improve adhesion
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.56.297.pdf
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