AMIYA Shigetoshi Kuraray Co.Ltd., Research Lab., General Manager, 物性研究所, 所長(研究職)
YOSHIE Naoko Tokyo Institute of Technology, Fac.Biosci.Biotech., Assistant, 生命理工学部, 助手 (20224678)
Bacterially synthesized poly (3-hydroxybutyric acid), which is a biodegradable and biocompatible thermoplastics, is expected as an environmentally adaptable polymer materials. But it has not been used industrially, because it is highly crystalline and brittle, and it depolymerizes rapidly at the melting (namely, processing) temperature. In this study, in order to overcome these shortcomings, several composite materials, based on bacterially synthesized 3-hydroxybutyric acid-containing homo-and copolyesters and chemically synthesized polymers, have been prepared and morphological and physical properties of these composites have been studied by solid-state high-resolution ^<13>C NMR,differntial scanning calorimetry, FT-IR,and optical microscopy. As blending partners, chemically synthesized isotactic-, syndiotactic-, and atactic-poly (vinyl alcohol) s, and bacterially synthesized 3-hydroxybutyric acid/3-hydroxyvaleric acid and 3-hydroxybutyric acid/3-hydroxypropionic acid copolyesters with a wide range of comonomer composition were used. By blending with these partners, the morphology as well as some physical properties of bacterially synthesized polyesters could be modified, leading to novel biodegradable polymer composite materials with higher quality.