摘要
Highly refractive and transparent polyamides containing thiadiazole units have been developed. These polymers were prepared by a polycondensation reaction of 4,4＇-（1,3,4-thiadiazole-2,5-thio） his（methylene） dibenzoyl chloride （TDTBM-DC） and diamine which contained thioether （--S--） and sulfone units. They showed good thermal stabilities such as a relatively high glass transition temperature of 206-233℃ and a 5% weight-loss temperature （T5%） of 376-395 ℃. The optical transmittance of the polymer at 450 nm is higher than 83%. The heterocycle units and plural --S-- linkages provide the polymer with a high refractive index of 1.716-1.725 at 633 nm and a low birefringence of 0.003-0.004. Also they showed improved solubility in polar aprotic solvents and could form moderate strength films with tensile strength of 72.8-83.1 MPa and storage modulus of 1.0-1.8 GPa （at 200 ℃）.
Highly refractive and transparent polyamides containing thiadiazole units have been developed. These polymers were prepared by a polycondensation reaction of 4,4＇-（1,3,4-thiadiazole-2,5-thio） his（methylene） dibenzoyl chloride （TDTBM-DC） and diamine which contained thioether （--S--） and sulfone units. They showed good thermal stabilities such as a relatively high glass transition temperature of 206-233℃ and a 5% weight-loss temperature （T5%） of 376-395 ℃. The optical transmittance of the polymer at 450 nm is higher than 83%. The heterocycle units and plural --S-- linkages provide the polymer with a high refractive index of 1.716-1.725 at 633 nm and a low birefringence of 0.003-0.004. Also they showed improved solubility in polar aprotic solvents and could form moderate strength films with tensile strength of 72.8-83.1 MPa and storage modulus of 1.0-1.8 GPa （at 200 ℃）.
基金
financially supported by the Youth Fund of Sichuan University(No.2012SCU11009)
