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Journal of Thermoplastic Composite Materials
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Investigation by TGA—FTIR of the Effect of Styrene Content and Thickness on the UV-curing of Vinylester Resins

F. Cardona

Centre for Excellence in Engineered Fibre Composites CEEFC University of Southern Queensland, USQ Toowoomba, QLD, 4350 - Australia, cardona{at}usq.edu.au

D. Rogers

Centre for Excellence in Engineered Fibre Composites CEEFC University of Southern Queensland, USQ Toowoomba, QLD, 4350 - Australia

G. Van Erp

Centre for Excellence in Engineered Fibre Composites CEEFC University of Southern Queensland, USQ Toowoomba, QLD, 4350 - Australia

The influence of styrene content and thickness of the samples on the UV curing of vinyl ester/styrene resins (VERs) is investigated by DSC and the combination of TGA and FTIR (TGA—FTIR). The glass transition temperatures (Tg) of the network polymers after curing are found to be lower for the VERs with higher styrene content. The released heat during UV curing further increases the Tg, with this increase being proportional to the volume of the resins. Within the range of thickness investigated (up to 30 mm) the relative amount of emissions of styrene, VE, and CO2 are found to be similar at the top and at the bottom of the samples. Similar results are obtained from the TGA analysis, indicating that the VERs are fully or almost fully cured all along the cross section. A good correlation is found between the analysis of the thermal properties by DSC and the results obtained by the TGA—FTIR system.

Key Words: TGA—FTIR • styrene • vinylester • UV curing • Tg • heat released • cross-link density.

Journal of Thermoplastic Composite Materials, Vol. 20, No. 6, 601-615 (2007)
DOI: 10.1177/0892705707083950
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