Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지

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
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Poly (ethylene terephthalate) (PET)와 Poly (1, 4-phenylene terephthalate) (PHT)의 copolyester (PEHT)를 PHT 반복단위의 함량이 30mo1% 미만인 범위에서 용액중합으로 합성하고 이들의 물성을 조사하였다. PEHT 중 PHT의 함량이 증가함에 따라 유리전이 온도, 결정화 속도, 내열성은 증가하고, 녹는점은 감소하였다. PHT 반복단위 함량이 16.5, 24.9 mol %인 경우 액정성을 관찰할 수 있었으며, PET 반복단위와 PHT 반복단위에 의한 결정이 혼재함을 광각 X-선 회절로부터 관찰하였다.

Keywords