• A Study on Fabrication of Polyester Copolymers(IV) - Physical Properties of PET/BPA Copolymer
  • Hyun EJ, Lee SH, Gal YS, Jang SH, Choi HK, Shin BY, Sur GS, Kim BS
  • 폴리에스테르 공중합체의 Fabrication 연구 (IV) - PET/BPA 공중합체의 물리적 특성-
  • 현은재, 이소화, 제갈영순, 장상희, 최현국, 신부영, 서길수, 김봉식
Abstract
PET/BPA copolymer of terephthalic acid, bisphenol-A and ethylene glycol was melt-pressed and quenched in ice water. This copolymer film was drawn by capillary rheometer. Shrinkage, crystallinity, morphology, thermal, dynamic mechanical, and mechanical properties of these copolymer films were investigated. The PET/BPA copolymer film exhibited T-m lower than that of PET film. The crystallinity and density of these drawn copolymer films increased with draw ratio and draw rate but decreased with draw temperature. The tensile strength and tensile modulus of the copolymer films increased with draw ratio but decreased with draw temperature. Shrinkage of the drawn copolymer film decreased with draw ratio and draw rate.

테레프탈산(terephthalic acid), 비스페놀에이(bisphenol-A)와 에틸렌글리콜(ethylene glycol)로 제조된 PET/BPA 공중합체를 용융 압축시켜 필름을 만들어 얼음물에 급냉시켰다. 이 공중합체 필름을 모세관 레오메타로 고상 압출시켜 연신 필름을 만들었다. 이 연신된 필름의 수축율, 결정성, 형태학, 열적, 동역학적 및 기계적 특성을 조사하였다. 공중합체 필름의 융점은 순수 폴리에틸렌테레프탈레이트(PET)보다 낮게 나타났다. 또한 결정화도와 밀도는 연신비와 연신속도의 증가와 더불어 증가하였으나, 연신온도 증가와 더불어 감소하였다. 공중합체 필름의 인장강도와 인장탄성률은 연신비 증가와 더불어 증가하였고, 연신온도 증가에 따라 감소하였다. 연신된 공중합체 필름의 수축율은 연신비와 연신속도가 증가할수록 감소하였다.

Keywords: PET/BPA copolymer; drawing; thermal properties; mMechanical properties

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This Article

  • 2001; 25(2): 208-217

    Published online Mar 25, 2001

  • Received on Dec 9, 2000