微生物産生ポリエステルの結晶化速度に対するプロピオン酸セルロースの影響

概要

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The effects of the presence of cellulose propionate (CP) on the crystallization rate of ploy (β-hydroxybutyrate) (PHB) in PHB-CP blends were investigated by means of differential scanning calorimetry (DSC) and a polarizing microscope. The time required for crystallization and the radial growth rate of the spherulites were measured. In addition, the equilibrium melting point of PHB was determined by measuring the melting point of PHB in isothermally crystallized blends. The following results were obtained. 1) The crystallization rate of PHB in the blends decreased remarkably with increasing CP fraction. 2) The degree of crystallization of PHB in isothermally crystallized films was ca. 90% or that in as-cast films. It was independent of CP fraction and of the crystallization temperature. 3) The equilibrium melting points of PHB in isothermally crystallized blends (CP fraction ≧ 0.2) depressed several degrees by blending with CP, 4) The PHB spherulite in the blends is more open in texture compared with that of PHB homopolymer.
社団法人日本家政学会の論文
1998-02-15