Article
  • Kinetic Consideration of Melt-copolymerization of Poly(butylene terephthalate) (PBT) and p-Acetoxybenzoic Acid (ABA)
  • Kim DG, Park SY, Park CR
  • 폴리부틸렌테레프탈레이트와 파라아세톡시벤조산의 용융공중합 속도론에 대한 고찰
  • 김도경, 박수영, 박종래
Abstract
Poly(butylene terephthalate-co-oxybenzoate)(PBOT) containing mesogenic oxybenzoate units in the main chain was synthesized through ester exchange reaction by melt mixing of poly(butylene terephthalate)(PBT) and p-acetoxybenzoic acid(ABA). From the kinetics of the copolymerization reaction, the activation energies and the rate constants of homopolymerization and copolymerization, kb and kc, could be determined. From the reaction conditions of different compositions, 4/6, 5/5, and 6/4 of PBT/ABA, at 250, 260, and 270 ℃, it was revealed that copolymerization between PBT and ABA proceeds on a pseudo-second order reaction if the ABA content and its conversion are low. In this case, the ratio of rate constants of homopolumerization to copolymerixation was in the range from 1.08 to 3.17, indicating that the copolymer with more notable block character was obtained at the higher mole fraction of ABA and at higher temperature.

폴리부틸렌테레프탈레이트(poly(butylene terephthalate), PBT)와 파라아세톡시벤조산(p-acetoxylbenzoic acid, ABA)을 용융 에스테르 교환반응시킴으로써 주쇄 고분자에 강직한 벤젠고리가 도입된 poly(butylene terephthalate-co-oxybenzoate) (PBOT)를 합성하였다. PBT와 ABA를 다양한 조성비에서 중합하는 과정의 속도론적 고찰을 통해 ABA의 단독중합 속도상수와 PBT에의 공중합 속도상수 및 그 비를 구하였으며 각각의 활성화에너지를 구하였다. PBT와 ABA의 조성비를 4/6, 5/5, 6/4로 하고 온도를 각각 250, 260, 270°C로하여 실험한 결과 공중합반응은 ABA함량이 낮고 또 그 전환율이 크지 않을 경우 의사 2차반응으로 볼수 있었다. 이때의 공중합 속도에 대한 단독중합 속도의 비는 1.08에서 3.17사이의 값을 가졌으며, ABA함량과 온도가 높을수록 큰 값을 가졌다. 이로써 PBT/ABA계의 공중합은 반응온도가 높고 ABA조성비가 클수록 ABA의 블록성이 강해지는 경향을 나타냈다.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2000; 24(1): 16-22

    Published online Jan 25, 2000