Effects of C 60 on the Glass Transition Temperature of Carbazole-based Photorefractive Polyphosphazenes

The bi-functional carbazole-based photorefractive polyphosphazenes with different content of C 60 -doped were fabricated. The glass transition temperature ( T g ) of these polymer composite materials was determined using a differential scanning calorimetric (DSC) method. According to the DSC measurement results with different heating rates, the variation of T g and the active energy of glass transition ( E g ) were analyzed in detail. The analysis results indicate that the transition region shifts to higher temperatures with increasing heating rate, and C 60 content (below 1.0wt%) can influence the T g of photorefractive polyphosphazenes. The T g first increases and then decreases with the C 60 content (below 1.0wt%). The probable causes of the influence of C 60 on T g was proposed.