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Proceedings Paper

Development of a phase diagram to control composite manufacturing using Raman spectroscopy
Author(s): Stuart Farquharson; Jessica Carignan; Victor Khitrov; Antonio Senador; Montgomery Shaw
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Paper Abstract

Fiber reinforced epoxy resins manufactured in autoclaves are expected to continue to dominate the composites market through 2010. However, the ability to obtain consistent mechanical properties from product-to-product remains difficult. This is largely due to the inability to monitor and control epoxy cure, loosely defined as the process of chain extension and cross-linking. Current autoclave process control employs a heat schedule based on a time-temperature-transformation (TTT) phase diagram that is determined by dynamic mechanical rheology. The phase diagram defines epoxy cure in terms of gelation and vitrification. We have been using an FT-Raman spectrometer to develop correlations between molecular (chain extension and cross-linking) and macroscopic (gelation and vitrification) data. The basis of a TTT phase diagram using Raman kinetic data for process control will be presented for several reactions.

Paper Details

Date Published: 8 March 2004
PDF: 11 pages
Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004); doi: 10.1117/12.512227
Show Author Affiliations
Stuart Farquharson, Real-Time Analyzers, Inc. (United States)
Jessica Carignan, Real-Time Analyzers, Inc. (United States)
Victor Khitrov, Real-Time Analyzers, Inc. (United States)
Antonio Senador, Univ. of Connecticut (United States)
Montgomery Shaw, Univ. of Connecticut (United States)

Published in SPIE Proceedings Vol. 5272:
Industrial and Highway Sensors Technology
Brian Culshaw; Samuel David Crossley; Helmut E. Knee; Michael A. Marcus; John P. Dakin, Editor(s)

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