Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 102, Issue -, Pages 132-138Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2014.07.027
Keywords
Dielectric analysis (DEA); Curing; Thermomechanical properties; Differential scanning calorimetry (DSC); Rheology
Categories
Funding
- National Science Foundation [CMMI-1229011]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1229011] Funding Source: National Science Foundation
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The cutting, lay-up and bagging of out-of-autoclave (OOA) prepregs for composite part fabrication can take from several days to weeks, depending on the desired part size. This period of ambient temperature out-time induces resin polymerization/cross-linking, and affects critical physicochemical phenomena such as minimum viscosity, gelation, and vitrification. Therefore, the capability to monitor out-time at ambient conditions and to understand its influence on key resin properties is valuable to minimize waste and increase efficiency. In this study, the dielectric properties of out-of-autoclave (OOA) carbon/epoxy prepreg aged from 0 to 7 weeks are investigated. The measured dielectric data is used to develop an in-situ out-time monitoring method at ambient condition. Furthermore, the effects of out-time and out-life on critical physicochemical parameters are identified. (C) 2014 Elsevier Ltd. All rights reserved.
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