The Physical Properties of Poly(2-cyano-p-phenylene terephthalamide) Solutions with Different Metal Salt Content in Polar Organic Solvents
Kim Chaejin (1), Jung Dae Eon (1), Jang Han Beol (1), Eom Youngho (1), Lee Eun Jeoung (1), Chae Dong Wook (2), Rho Kyeong-Hwan (3), Kim Byoung Chul (1)*
(1) Department of Organic and Nano Engineering, Hanyang University - Seoul - SouthKorea, (2) Department of Textile Engineering, Kyungpook National University - Gyeongsangbuk-do - SouthKorea, (3) Heracron Institute, Kolon Central Research Park, Kolon Industries, Inc. - Gumi - SouthKorea
The commercial-grade poly(p-phenylene terephthalamide) (PPTA) fiber is produced by using fuming sulfuric acid as solvent. Lots of polymer researchers have been focusing on designing organo-soluble para-aramids due to the difficulty in handling the sulfuric acid based spinning system. Poly(2-cyano-p-phenylene terephthalamide) (CY-PPTA) has proved as a good candidate for this, which is soluble in several organic solvent systems such as N,N-dimethylacetamide/lithium chloride (DMAc/LiCl) and N-methyl-2-pyrrolidon/calcium chloride (NMP/CaCl2). In this study, the physical and rheological properties of CY-PPTA solutions in DMAc or NMP were evaluated in terms of content of metal salts to specify the respective role of each metal salts in the solution dope. The solubility of CY-PPTA in the dilute solutions will be systematically discussed in terms of the metal salt content. In addition, temperature dependence of physical properties of CY-PPTA solutions will be examined with different combination of solvents and metal salts.
Keywords: CY-PPTA, PPTA, liquid crystalline polymer, rheology