| 초록 |
In this work, the effect of different proportions of vinylester (VE) and unsaturated polyester (UP) was investigated in terms of the thermal stabilities and mechanical properties of the blends. The compositions of VE/UP blend were varied within 0:100, 20:80, 40:60, 60:40, 80:20, and 100:0 by weight percent. 1 wt% 1-hydroxy-cyclohexyl-phenyl-ketone was used as a photoinitiator. The blend system was UV-cured by using 60 mW/cm2 UV chamber during 3 min. Infrared spectra of the cured VE/UP system were measured by Fourier transform infrared (FT-IR) spectroscopy in order to investigate the change of functional groups. Thermal stabilities and mechanical properties of the system were determined by thermogravimetric analysis (TGA) and flexural strengths, respectively. As a result, the peak intensity of epoxide groups was decreased in the UV-cured specimen, which was due to the acrylation of epoxy rings during the UV-curing. Also, the decomposition activation energy and flexural strength of the specimens were increased with increasing the VE content. These results could be explained by the stable aromatic structure of VE in the VE/UP blend system.
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