Physical Properties of Poly(ethylene terephthalate)-Poly(1, 4-phenylene terephthalate) Copolyester

Poly (ethylene terephthalate)-Poly (1, 4-phenylene terephthalate) Copolyester의 물성

  • Ahn, Tae Oan (Department of Chemical Technology, Seoul National University) ;
  • Nam, Byeong Uk (Department of Chemical Technology, Seoul National University) ;
  • Park, Jong-Yoon (Department of Science Education, Ewha Womans University)
  • 안태완 (서울대학교 공과대학 공업화학과) ;
  • 남병욱 (서울대학교 공과대학 공업화학과) ;
  • 박종윤 (이화여자대학교 과학교육과)
  • Received : 1991.06.10
  • Published : 1991.09.30


Copolyesters (PEHT) of poly (ethylene terephthalate) (PET) and poly (1,4-phenylene terephthalate) (PHT) were synthesized by the solution polymerization with the PHT unit contents of less than 30 mol %, and their physical properties were studied. As the content of PHT unit in PEHT was increased, glass transition temperature, crystallization rate, thermal stability increased, whereas melting temperature decreased. When the PHT unit contents were 16.5 and 24.9 mol%, nematic mesophase was observed. Wide angle X-ray diffraction pattern showed the peaks originated from both PET unit and PHT unit.