Developmental Study on High-quality Biodegradable Polymer Composites Based on Bacterially Synthesized Polyesters

细菌合成的聚（3-羟基丁酸）是一种生物可降解和生物相容性好的热塑性塑料，有望成为一种环境适应性高分子材料。但它还没有在工业上使用，因为它是高度结晶性和脆性的，并且在熔化（即加工）温度下会迅速解聚。在本研究中，为了克服这些缺点，以细菌合成的含3-羟基丁酸的均聚和共聚聚酯以及化学合成的聚合物为基础，制备了几种复合材料，并通过固态高分辨率^<13>C NMR、差示扫描量热法、FT-IR和光学显微镜研究了这些复合材料的形态和物理性质。作为共混伙伴，化学合成了等规、同规和无规聚乙烯醇，细菌合成了3-羟基丁酸/3-羟基戊酸和3-羟基丁酸/3-羟基丙酸共聚酯，其共聚单体组成范围广泛。通过与这些伙伴共混，可以改变细菌合成聚酯的形态和某些物理性质，从而获得更高质量的新型可生物降解高分子复合材料。

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.