alexa Gas Chromatography: A Novel And New Technique For On-line Cure Monitoring Studies Of Carbon-phenolic Composite Structures | 70432
ISSN: 2157-7064

Journal of Chromatography & Separation Techniques
Open Access

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4th World Congress on Chromatography

K Veera Brahmam and V Venkateswara Rao
Advanced Systems Laboratory, Hyderabad, India
Posters & Accepted Abstracts: J Chromatogr Sep Tech
DOI: 10.4172/2157-7064-C1-032
Abstract
We report the use of gas chromatography technique for on-line cure monitoring of the carbon-phenolic(C-P) composites to identify the gelation region for pressure application to enhance the thermal performance. Experimental trials are made on the laminates prepared by hand lay-up process in autoclave. During curing process methylol-phenol (M-phenol) and water are evolved as reaction by-products and the concentrations of the evolved byproducts are monitored by on-line gas chromatograph connected to autoclave facility. Experimental parameters like sample injection method, sample volume and time of injection have been optimized and m-phenol and water evolution concentrations are monitored as a function of component temperature. M-phenol evolution is more consistent compared to water evolution and therefore based on the falling trend of the methylol phenol concentration a broad region of gelation for pressure application is identified. The region thus identified is further narrowed down based on the diminishing trend of the M-phenol concentration and the experimental analysis of the laminates focusing on resin content and void content. Finally the on-line pressure application criterion was established based on the resin content and void content data. Based on the resin content and the low void content the performance of the C-P structure is evaluated.
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