Proceedings of the Korean Fiber Society Conference (한국섬유공학회:학술대회논문집)
- 1987.06b
- /
- Pages.12-12
- /
- 1987
A STUDY ON THE LYOTROPIC LIQUID CRYSTALLINE COPOLYAMIDE
- Lee, Chul-Joo (Fibre Science Lab., KAIST) ;
- Min, Byoung-Gill (Fibre Science Lab., KAIST) ;
- Son, Tea-Won (Fibre Science Lab., KAIST) ;
- Yoon, Han-Sik (Fibre Science Lab., KAIST)
- Published : 1987.06.01
Abstract
To improve the fibrillation phenomenon and processibili to of poly(p-phenyleneterephthalamide) (PPD-T) , a P/E copolyamide was prepared by introducing 4,4'-ethylene dianiline (EDA) into rigid chain backbone. The effects of semi-flexible segment on the liquid crystalline properties were investigated. The EDA, used as a comonomer, was prepared by catalylitic reduction of p,p'-dinitrophenyl , obtained by oxidative coupling of p,p'-dinitrotoluene. Various high molecular weight PIE copolyamides were prepared by low temperature solution polycondensation of terephthaloyl chloride (TPC) with various mixtures of p-phenylene diamine (PPD) and EOA. The PfE copolyamides were completely dissolved in 100% svlfuric acid, and the phase transition of P/E copolyamide-sulfuric acid systems was examined in teams of concentration and temperature. Over the chemical compositions, PIE=911, 812, and 713, solutions of anisotropic single phase were acquired. In particular, the two mixing ratios, 911 and 812, gave a good anisotropic spinning dope.
Keywords