Miscibility of Liquid Crystalline Copolyester and Polyarylate

• Main Authors: Tyan, Horng-Long, 田宏隆
• Other Authors: Kung-Hwa Wei
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/56563565718843073977

碩士 === 國立交通大學 === 材料科學與工程研究所 === 84 === The miscibility of blends of liquid crystalline copolymer of poly(p-oxybenzoate-co-p-phenyleneisophthalate) (HIQ) with polyarylate (PAr) has been investigated with differential scanning calorimetry (DSC). HIQ/PAr blends were prepared by solution blending of both polymers in a mixed solvent of 50/50 phenol/tetrachloroethane. The phases in blends have been studied with polarizing microscopy (POM). A single glass transition temperature was obtained for the HIQ/PAr blends when the weight ratio of HIQ/PAr in these blends was less than 40%. Two glass transition temperatures were obtained when the weight ratio of HIQ in these blends was larger than or equal to 40%. The lower glass transition temperature around 138℃ remains almost changed, but the higher glass transition temperature decreased from 183℃ to 173℃ as the weight ratio of HIQ increasing from 40% to 80%. Annealing blends of HIQ/PAr at 315℃ for a few minutes, reaction occurred as confirmed by Nuclear Magnetic Resonance (NMR) spectroscopy. It was found that the HQ in HIQ reacted with PAr in 3 min, and then HBA and IA reacted with PAr after 6 min's annealing from both proton and carbon NMR. The fact that the intrinsic viscosity of HIQ/PAr blends increased with annealing time needs to be reconfirmed and explained.