| 초록 |
Polymer nanocomposites composed of UV curable polyester-acrylate and organoclay were prepared by photopolymerization. The photopolymerization reaction was investigated by FTIR spectroscopy, and it was shown to proceed rapidly ( ＞90% conversion) within a few seconds of UV irradiation. The conversion of the polyester-acrylate/clay system during photopolymerization was calculated from the area of the absorption peak for the vinyl group vibration occurring at 810 cm-1. To see the effect of photoinitiator type and reactive diluent type on the UV curing behavior of the polyester-acrylate resin system, three photoinitiators of 2-methyl-1[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 1-hydroxy-cyclohexyl-phenyl-keton, and benzophenone, and three reactive diluents of octyl/decyl acrylate (ODA), hexanediol diacrylate (HDDA), and trimethylol propane triacrylate (TMPTA), were used. The structures of the nanocomposites were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The physical properties of the nanocomposites were examined by universal testing machine (UTM), thermomechanical analysis (TMA), thermogravimetric analysis (TGA) and UV-visible spectrophotometer. |
