Synthesis and Properties of Novel Y-type Nonlinear Optical Polyester Containing Cyanovinylthiophene with Enhanced Thermal Stability of Second Harmonic Generation

The organic materials seem to be superior because of their high er nonlinear optical activity and faster response time than the inorganic ones. Among the organic materials, NLO polymers are receiving great attention, mainly because they offer many advantages such as mech-anical endurance, light weight , chemical resistance, and good processability to form electro-optic devices. A potential NLO polymer must contain highly polarizable conjugated dipolar electronic systems and they have to be mechanically very strong and thermally stable with high glass-transition tem-perature (