Abstract

The effect of UV radiation on the thermal, structural and mechanical properties of Bayfol CR6-2 polymer samples has been investigated. These samples were exposed to different energy fluences of UV in the range 10-200 J/cm2. Simultaneous thermogravimetric analysis (TGA) and differential thermal analysis (DTA) have been performed on Bayfol samples of 0.3 mm thickness. The structural modifications in the UV irradiated Bayfol samples have been studied as a function of fluence using Fourier Transform Infrared spectroscopy. In addition, the mechanical properties of the irradiated and non irradiated samples were studied. The results indicate that the irradiation of Bayfol polymer at the fluence range 130-200 J/cm2, leads to cross-linking process that strengthens the polymer against thermal degradation. The results of FTIR and mechanical measurements indicated that the scission takes place at the carbonate site with the formation of hydroxyl group. Also, at the fluence range 0-130 J/cm2, the standard chains and a great number of chain ends weaken and the material may become softer. This paper also reviews recent developments along with some patents. It concentrates on solving the low thermal stability of the material due to some structural defects during polymerization process. The attempts to decrease these defects and improving the thermal stability help in using these materials in industry applications.

Keywords: UV irradiation, polycarbonate, FTIR, thermal, &, mechanical properties