文章信息/Info

Title:

Crystallization Behavior and Mechanical Properties of Bio-based Polyhydroxyalkanoates

作者:

相恒學; 曾佳; 陳姿曄; 周哲; 朱美芳

（東華大學材料科學與工程學院 纖維材料改性國家重點實驗室,上海 201620）

Author(s):

XIANG Hengxue; ZENG Jia;  CHEN Ziye;  ZHOU Zhe;  ZHU Meifang

(State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China)

關鍵詞:

聚羥基脂肪酸酯; 生物基材料; 雜化材料; 長鏈支化; 結晶; 力學性能

Keywords:

polyhydroxyalkanoate;  bio-based material;  hybrid material;  long-chain branching;  crystallization;  mechanical properties

DOI:

10.7502/j.issn.1674-3962.2019.05.05

文獻標志碼:

A

摘要:

聚羥基脂肪酸酯(PHAs)是目前唯一一種由微生物直接合成的生物基聚酯，能夠實現材料合成、制品加工和回收降解的全周期綠色生態循環，因而在紡織纖維、包裝材料、生物醫用材料等領域有著潛在的應用市場。然而，PHAs自身也存在著結晶速率慢、球晶尺寸大和二次結晶等不利結構因素，限制了產品的應用性能。因此，重點從物理異相成核誘導、化學長鏈支化結構設計和外場多級牽伸誘導3個方面闡述PHAs結晶結構和力學性能的改性研究進展。首先，具有高耐熱的無機納米材料（如硫化鎢）可顯著提高PHAs異相成核能力；其次，長鏈支化結構可以提高PHAs熔體強度；再次，在多級牽伸誘導作用下，可協同誘導PHAs聚集態的晶型結構演變，從而獲得強度高、韌性好的PHAs纖維。最后，對PHAs的研究和應用做出了進一步的展望。

Abstract:

Polyhydroxyalkanoates (PHAs) is the only bio-based polyester directly synthesized by microorganisms, which can achieve a full green ecological cycle from raw material preparation, product processing to material degradation. With the advantages of being green and environment-friendly, PHAs have potential applications in textile fibers, packaging materials, and biomedical materials. However, PHAs also have unfavorable structural factors such as slow crystallization rate, large spherulite size and secondary crystallization, which limit their application. Therefore, this paper mainly focuses on the research progress of modification of the crystal structure and mechanical properties of PHAs from three aspects: the heterogeneous nucleation effect, the long�瞔hain branching structure design and the external field induction. First, inorganic nanomaterials with high heat resistance (tungsten sulfide) can be used to significantly improve the heterogeneous nucleation ability of PHAs. Secondly, the long-chain branched structure can be used to compensate for the lack of PHA melt strength. Furthermore, the crystal form of PHAs can be changed by the synergistic effect between heterogeneous nucleation, long-chain branching and drawing process. Finally, further research directions and applications of PHAs have also been presented.