Synthesis and characterization of a new high-Tg photorefractive material

The synthesis and characterization of a new high-Tg photorefractive polymer, polyphosphazene P2, was described. It was obtained via a post-azo coupling reaction. The resulting material has been characterized by means of 1H NMR, 31P NMR, FT-IR, UV-vis, GPC and DSC. Chromophore contents up to 14 mol% have been realized. The molecular weights of polyphosphazene P2 are 3.3 × 104 (Mn) and 4.3 × 104 (Mw), respectively; and the glass-transition temperature is high (170 °C). Measurements reveal that it possesses relatively large magnitude of photoinduced birefringence (4.2-4.7 × 10−3).