School of Mechanical and Automotive, South China University of Technology, Guangdong Guangzhou 510640, China; Tianjin Fire Research Institute of the Ministry of Public Security, Tianjin 300381, China.
School of Mechanical and Automotive, South China University of Technology, Guangdong Guangzhou 510640, China.
Carbohydr Polym. 2019 Feb 15;206:827-836. doi: 10.1016/j.carbpol.2018.11.036. Epub 2018 Nov 17.
Sustainable biodegradable polymers with high performances is the optimized alternatives for resolving environmental key issues evoked by petroleum-based polymer. A novel bio-based elastomer was designed and developed using reactive extrusion for the mixtures of starch, glycerol and tartaric acid (TPS-TA). Then TPS-TA was extruded with PBS (30:70, wt%) to fabricate the bio-composites and the impact strength of PBS/TPS-TA was superior to that of PBS. The toughness mechanism was explored by analyzing the properties variations for the TPS-TA and PBS matrix, and their interfacial adhesion, systematically. Effects of TA on the structure of TPS and compatibility for PBS were evaluated by FT-IR, viscosity measurement, DSC, DMA and SEM, respectively. They revealed that TA reduced the molecular weight of starch and shear viscosity of TPS were beneficial for TPS-TA uniformly dispersing in PBS matrix as ellipse feature with 0.5 um averaged diameter. Simultaneously, TA also served as coupling effect to improve the compatibility of TPS and PBS matrix, and induce the morphology of bio-composites to transform from "sea-island" structure to homogeneous phase. Interesting, TPS-TA could depress the crystallization capability of PBS by the results of DSC, XRD and POM, which evidenced that the variations in the crystallization properties of PBS matrix are not responded to the impact strength improvement of PBS/TPS-TA. This study proposed a facile approach to fabricate low-cost PBS bio-composites with significant improved mechanical properties.
具有高性能的可持续生物降解聚合物是解决石油基聚合物引发的环境关键问题的优化替代品。使用反应挤出法设计和开发了一种新型生物基弹性体，用于淀粉、甘油和酒石酸（TPS-TA）的混合物。然后将 TPS-TA 与 PBS（30:70，wt%）共挤出，制备生物复合材料，PBS/TPS-TA 的冲击强度优于 PBS。通过分析 TPS-TA 和 PBS 基体的性能变化及其界面附着力，系统地探讨了韧性机理。通过 FT-IR、粘度测量、DSC、DMA 和 SEM 分别评估 TA 对 TPS 结构和 PBS 相容性的影响。结果表明，TA 降低了淀粉的分子量，TPS 的剪切粘度有利于 TPS-TA 以 0.5 µm 平均直径的椭圆形特征均匀分散在 PBS 基体中。同时，TA 还作为偶联剂改善了 TPS 和 PBS 基体的相容性，并促使生物复合材料的形态从“海-岛”结构转变为均匀相。有趣的是，TPS-TA 通过 DSC、XRD 和 POM 的结果可以抑制 PBS 的结晶能力，这表明 PBS 基体结晶性能的变化与 PBS/TPS-TA 冲击强度的提高无关。本研究提出了一种制备低成本 PBS 生物复合材料的简便方法，可显著提高其力学性能。
