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Abstract
The feasibility of deploying optical fiber sensors to obtain qualitative and quantitative information on the cross-linking characteristics of thermosetting resin systems has been demonstrated by a number of researchers. This article is concerned with the demonstration of a low-cost fiber-optic Fresnel sensor system for monitoring the cross-linking reactions at multiple locations. Cross-linking reactions can be influenced by a number of parameters including the stoichiometry of the resin and hardener, and the heat-transfer rates in and out of the preform as a function of the cross-section of the preform. In situations where there is a variation in the thickness of the preform or when large components are processed, a facility to monitor the cross-linking reactions at multiple locations will be valuable because the rate and extent of the cross-linking can be inferred. In this article, six Fresnel sensors were immersed in individual vials containing an epoxy/amine resin system and processed (cross-linked) in an air-circulating oven. One additional vial with a Fresnel sensor immersed in the neat epoxy resin (no hardener) was co-located in the oven to enable the effect of temperature to be monitored. The feasibility of using the multiplexed Fresnel sensors for cure monitoring was demonstrated successfully. The sensors in the post-cross-linked samples were used to study the effects of heating and cooling cycles. The feasibility of detecting the glass transition temperature using the Fresnel sensor is discussed along with the factors that give rise to variability in the output Fresnel signals. © 2014 The Authors. Journal of Applied Polymer Science Published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41088.
Original language | English |
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Article number | 41088 |
Journal | Journal of Applied Polymer Science |
Volume | 131 |
Issue number | 22 |
Early online date | 3 Jul 2014 |
DOIs | |
Publication status | Published - 15 Nov 2014 |
Keywords
- cross-linking
- resins
- manufacturing
- optical properties
- thermosets
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Dive into the research topics of 'Multi-point monitoring of cross-linking reactions'. Together they form a unique fingerprint.Projects
- 1 Finished
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TSB/EPSRC - Environmentally friendly and energy efficient pultrusion
Engineering & Physical Science Research Council, TECHNOLOGY STRATEGY BOARD
18/08/08 → 31/07/12
Project: Research