By D. Mulligan
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Extra info for Cure Monitoring for Composites and Adhesives
2479-98 CURE KINETIC MODEL, HEAT OF REACTION, AND GLASS TRANSITION TEMPERATURE OF AS4/3501-6 GRAPHITE-EPOXY PREPREGS Kim J; Moon T J; Howell J R Texas,University at Austin An isothermally-based cure kinetic model for a carbon graphite-epoxy AS4/3501-6 benchmark prepreg system containing tetraglycidyl methylenedianiline, alicyclic diepoxy carboxylate, epoxy cresol novolac, diaminodiphenyl sulphone and boron trifluoride amine complex is presented. The cure kinetics of the prepreg were determined by DSC and the mass fraction of the epoxy resin in the prepreg by thermogravimetry.
Interpretation of calorimetric and spectroscopic analysis revealed a high consumption of isocyanate early in cure. Mechanical strength, however, as revealed by lap shear tests, did not develop until late in cure. Low lap shear strengths and a plateau in conversion rates were detected for samples pressed at 110 and 120C. Several components of the analysis suggested that low temperature cure could result in crystal formation, leading to diffusion controlled cure. 24 refs. 144-54 EQUIVALENT PROCESSING TIME ANALYSIS OF GLASS TRANSITION DEVELOPMENT IN EPOXY/CARBON FIBER COMPOSITE SYSTEMS Park I-K; Lee D-S; Nam J-D Sung Kyun Kwan,University Differential scanning calorimetry was used to examine cure kinetics and glass transition temperature development during the cure of a commercially available epoxy resin/ carbon fibre prepreg system.
UV light curing acrylate materials are used in many processes requiring fast cure and very low VOCs. Many methods are available to quantify how fast the acrylate material cures. One method of determination involves the measure of disappearance of functional groups with exposure to UV light. Acrylate concentration can easily be quantified by FTIR spectroscopy peak integration. Transmission spectroscopy may be used to determine % cure vs. exposure time. This is useful to determine how fast a material will cure using a particular light source.