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Synthesis and in-situ fibrillation of polyethylene galactarate (PEGa)

서울대학교 대학원
Publication Date
  • 수용성 폴리에스테르
  • Water Soluble Polyester
  • 삼산화안티몬
  • Antimony Trioxide
  • 축합중합
  • Polycondensation


Microsoft Word - 00000001.doc i Abstract During the last three decades, various polyfunctional polymers based on carbohydrates, e.g. polyhydroxypolyamides and polyesteramides have been reported and synthesized by condensation polymerization technique. However, it could be done via complicated reaction routes going through protecting and deprotecting process. In this study, novel water soluble biodegradable polyester, poly(ethylene galactarate) (PEGa), was synthesized by direct condensation polymerization of galactaric acid and ethylene glycol. To avoid complicated protecting- deprotecting steps in the synthesis, prepolymer was synthesized in the first stage, and then PEGa was finally obtained through ester-exchange reaction ing the second stage. For the optimization of reaction conditions, the formation behavior of oligoester was monitored as functions of conversion, catalytic effect with various catalysts as antimony trioxide(Sb2O3), sodium ii acetate(CH3COONa), non-catalyst. It was found that Sb2O3 was most effect catalyst. The weight average molecular weights of PEGa were approximately several thousands~32,000 along with the reaction conditons. Glass transition temperature (Tg) of the obtained PEGa was about 50°C. Degradation temperature of PEGa was about 220-260°C. The PEGa was dissolved in polar organic solvents, especially water, but insoluble non-polar organic solvents, e.g. hexane, benzene etc. During the polymerization, in-situ fibrillation occurred although the amount was not so much. All the microsize fibers consisted of nanofibrils of 20~40nm in diameter. Key words: water soluble polyester; antimony trioxide; polycondensation

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