Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China.
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
Int J Biol Macromol. 2019 Sep 15;137:1169-1178. doi: 10.1016/j.ijbiomac.2019.07.068. Epub 2019 Jul 10.
Fully biodegradable blends of poly (butylene carbonate) (PBC) and a bioresource-based stereocomplex polylactide (sc-PLA) were prepared by melt compounding at a temperature far below the melting point (T) of sc-PLA, and above the T of PBC, poly (l-lactide) (PLLA) and poly(d-lactide) (PDLA). sc-PLA was uniformly dispersed in the PBC matrix as spherical particles. Interestingly, the size of the dispersed sc-PLA particles did not increase significantly with increasing amounts of PLLA and PDLA. sc-PLA accelerated the non-isothermal and isothermal melt crystallization of PBC. Simultaneously, the thermal decomposition temperature of the PBC/sc-PLA blends increased by about 46 °C. The solid filler sc-PLA could reinforce the PBC matrix over a relatively wide temperature range. Consequently, formation of the percolation network structure of spherical sc-PLA in the blends significantly improved the rheological and mechanical properties of PBC after incorporation of sc-PLA. This report may open a new avenue to achieve higher-performance biodegradable polymer blend materials.
聚丁二酸丁二醇酯（PBC）和生物基立构复合聚乳酸（sc-PLA）的完全可生物降解共混物通过在低于 sc-PLA 的熔点（T）、高于 PBC、聚 L-乳酸（PLLA）和聚 D-乳酸（PDLA）的温度下熔融共混制备。sc-PLA 均匀分散在 PBC 基体中呈球形颗粒。有趣的是，随着 PLLA 和 PDLA 用量的增加，分散的 sc-PLA 颗粒的尺寸没有显著增大。sc-PLA 加速了 PBC 的非等温和等温熔融结晶。同时，PBC/sc-PLA 共混物的热分解温度升高了约 46°C。固体填料 sc-PLA 可以在相对较宽的温度范围内增强 PBC 基体。因此，共混物中球形 sc-PLA 渗流网络结构的形成显著改善了掺入 sc-PLA 后 PBC 的流变和力学性能。本报告可能为制备高性能可生物降解聚合物共混材料开辟新途径。
