Strong fibers and films of microbial polyesters
Strong fibers and films of microbial polyesters
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DOI：
10.1002/mabi.200500066
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发表时间：
2005-08-12
影响因子：
4.6
通讯作者：
Iwata, T
中科院分区：
文献类型：
--
作者：
Iwata, T
聚[（R）-3-羟基丁酸酯]（P（3 HB））及其共聚物作为细胞内碳和能量材料被各种微生物积累，并且作为生物可降解和生物相容性热塑性塑料被广泛研究。然而，这些微生物聚酯由于其刚性和脆性而没有被认为是实用的。最近，通过新的拉伸技术，我们成功地从野生型和重组细菌产生的微生物聚酯中获得了坚固的纤维和薄膜。纤维和膜的机械性能的改善不仅是由于分子链的取向，而且还由于由原纤和层状晶体形成的锯齿形构象和网络结构的产生。用同步辐射微束X射线衍射分析了抗拉强度大于1.0GPa的强纤维的结构。强纤维和膜在自然、河流淡水中或通过细胞外聚羟基丁酸酯解聚酶完全降解。在这篇专题文章中。介绍了微生物聚酯强力纤维和薄膜的加工、力学性能、高度有序结构和生物降解性。
Poly [(R)-3-hydroxybutyrate] (P(3HB)) and its copolymers are accumulated by a wide variety of micro-organisms as intracellular carbon and energy material, and are extensively studied as biodegradable and biocompatible thermoplastics. However, these microbial polyesters have not been recognized as practical because of their stiffness and brittleness. Recently, by new drawing techniques, we succeeded in obtaining strong fibers and films from microbial polyesters, produced by both wild-type and recombinant bacteria. The improvement in mechanical properties of the fibers and films is due not only to the orientation of molecular chains, but also to the generation of a zigzag conformation and network structure, formed by fibrillar and lamellar crystals. The structure of strong fibers with a tensile strength over 1.0 GPa was analyzed by micro-beam X-ray diffraction with synchrotron radiation. The strong fibers and films were completely degraded in natural, river freshwater or by extracellular polyhydroxybutyrate depolymerases. In this feature article. the processing, mechanical properties, highly ordered structure and biodegradability of strong fibers and films produced from microbial polyesters are presented.