Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Synthesis and Characterization of para-Aramid Copolymers Containing Cyano Groups

시아노기를 도입한 파라계 아라미드 공중합체의 합성과 특성분석

  • Yeo, Moon Jin (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University) ;
  • Gu, Nam Dae (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University) ;
  • Jang, Eun Ji (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University) ;
  • Kang, Chan Sol (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University) ;
  • Jeong, Young Gyu (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University) ;
  • Baik, Doo Hyun (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University)
  • 여문진 (충남대학교 유기소재.섬유시스템공학과) ;
  • 구남대 (충남대학교 유기소재.섬유시스템공학과) ;
  • 장은지 (충남대학교 유기소재.섬유시스템공학과) ;
  • 강찬솔 (충남대학교 유기소재.섬유시스템공학과) ;
  • 정영규 (충남대학교 유기소재.섬유시스템공학과) ;
  • 백두현 (충남대학교 유기소재.섬유시스템공학과)
  • Received : 2014.05.05
  • Accepted : 2014.06.10
  • Published : 2014.06.30
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Abstract

Poly(p-phenylene terephthalamide) (PPTA) and poly(2-cyano-1,4-phenylene terephthalamide) (CNPPTA)-based copolymers were synthesized using a low temperature polycondensation reaction between terephthaloyl chloride, 2-cyano-1,4-phenylene diamine, and/or 1,4-phenylene diamine in a N-methylpyrrolidinone solvent containing 2% $CaCl_2$. The molecular structures and thermal stabilities of PPTA, CNPPTA, and copolymers of the two with different cyano group contents were characterized using FT-IR spectroscopy and thermogravimetric analysis, respectively. The liquid crystalline states and polymer concentration-dependent viscosities of NMP/$CaCl_2$ solutions containing different CNPPTA copolymer concentrations were investigated using polarized optical microscopy and viscometry, respectively. It was found that CNPPTA polymers with higher cyano group contents were more soluble in polar organic solvents, such as NMP, DMAc, and DMF, and that CNPPTA polymer solutions based on the NMP/$CaCl_2$ system formed liquid crystalline structures above certain critical polymer concentrations. In addition, TGA results revealed that, although the initial degradation temperatures of CNPPTA copolymers were quite comparable to that of PPTA, their char yields at $800^{\circ}C$ were far higher.

Keywords

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