New Aliphatic Diol/Dicarboxylic Acid Based Biodegradable Polyesters and Their in-vitro Degradations

새로운 지방족 디올/디카복실산계 생분해성 폴리에스테르 및 가수분해 특성

  • Kang Tae-Gon (Department of Chemistry, Hanyang University, Korea Center for Advanced Functional Polymers, KAIST) ;
  • Han Yang-Kyoo (Department of Chemistry, Hanyang University, Korea Center for Advanced Functional Polymers, KAIST)
  • 강태곤 (한양대학교 화학과, 한국과학기술원 기능성고분자신소재연구센터) ;
  • 한양규 (한양대학교 화학과, 한국과학기술원 기능성고분자신소재연구센터)
  • Published : 2005.05.01

Abstract

Four kinds of new aliphatic diols were synthesized by the ring opening reaction of glycolide with 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanediol, or 1,4-cyclohexanedimethanol, a difunctional initiator, in the presence of stannous octoate catalyst. The resulting diols were melt-polymerized with succinic acid, adipic acid, or suberic acid at 170, 190, or $220^{circ}C$ to produce new sequentially ordered aliphatic polyesters and their corresponding polyesters with random structure. Their glass transition temperatures ($T_g$) ranged from -40 to $30^{circ}C$, The sequentially ordered polyesters prepared at $170^{cir}C$ had higher $T_g$ of 5 to $10^{circ}$ than the polyesters with rand()m structure produced at higher temperature. From in-vitro degradation test the sequentially ordered polyesters was shower in the rate of hydrolysis in a buffer solution than the polymers with random molecular structure.

촉매인 stannous octeate 존재 하에서 글리콜리드를 이관능성 개시제인 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol과 반응시켜 4가지 종류의 새로운 지방족 디올을 합성하였다. 이들 새로운 디올과 succinic acid, adipic acid, 혹은 suberic acid와 titanium(IV) isopropoxide 촉매하에서 170, 190, 또는 $220^{circ}C$에서 축합중합 시켜 분자구조가 규칙적으로 배열된 새로운 지방족 폴리에스테르와 무질서한 구조를 갖는 폴리에스테르를 각각 얻었다. 이들 지방족 폴리에스테르들의 유리전이온도($T_g$)는 -40에서 $30^{circ}C$ 사이였다. 또한 $170^{circ}C$에서 제조된 분자구조가 규칙적으로 배열된 폴리에스테르가 높은 온도에서 합성된 구조가 무질서한 폴리에스테르들보다 $T_g$$5-10^{circ}C$ 정도 높았다. 체외분해 실험 결과, 분자구조가 규칙적으로 배열된 폴리에스테르가 불규칙한 중합체보다 완충용액 속에서 가수분해속도가 느렸다.

Keywords

References

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