Li Chonghua, Ren Liang, Gan Hongnian, Wang Yaobing, Shen Yunda, Sun Chuang, Mu Guangming, Zhang Mingyao
School of Chemical Engineering, Changchun University of Technology, Changchun 130012, China; Engineering Research Center for synthetic resin and special fiber, Ministry of Education, Changchun University of Technology, Changchun 130012, China.
School of Chemical Engineering, Changchun University of Technology, Changchun 130012, China; Engineering Research Center for synthetic resin and special fiber, Ministry of Education, Changchun University of Technology, Changchun 130012, China.
Int J Biol Macromol. 2025 May;307(Pt 4):142365. doi: 10.1016/j.ijbiomac.2025.142365. Epub 2025 Mar 20.
Mixing poly (lactic acid) (PLA) with another biodegradable resin, poly (butylene adipate-co-terephthalate) (PBAT), is a simple strategy to toughen PLA, but its effectiveness is limited, and stiffness is usually compromised. As a consequence, the simultaneous enhancement of strength and toughness in PLA has become of significant challenge in materials driven by growing demand for green polymers in expanded biodegradable fields. In this study, we design and fabricate a novel PLA composites based on a facile processing route consisting of rice husk modified with the silane coupling agent and alkaline (RHM) as the reinforcing agent, and PBAT grafting glycidyl methacrylate (GMA) as the toughening agent. The results indicated RHM promoted the crystalline behavior of the composites and improved the thermal stability, dimensional stability, melt strength and hydrophilicity. PBAT grafted by GMA greatly increased the compatibility of RHM with PLA, which was confirmed in rheological and DSC tests. The toughness of the composites increased by 199 %-237.6 % while maintaining better stiffness and degradability. This work presents a simple and effective strategy for preparing low-cost, and well-balanced stiff and tough PLA, thereby expanding the application range of PLA.
将聚乳酸（PLA）与另一种可生物降解树脂聚己二酸-对苯二甲酸丁二醇酯（PBAT）混合是增强PLA韧性的一种简单策略，但其效果有限，且通常会损害材料的刚度。因此，在对可生物降解领域绿色聚合物需求不断增长的推动下，同时提高PLA的强度和韧性已成为材料领域的一项重大挑战。在本研究中，我们基于一种简便的加工路线设计并制备了一种新型PLA复合材料，该路线包括用硅烷偶联剂和碱改性的稻壳（RHM）作为增强剂，以及甲基丙烯酸缩水甘油酯（GMA）接枝的PBAT作为增韧剂。结果表明，RHM促进了复合材料的结晶行为，提高了热稳定性、尺寸稳定性、熔体强度和亲水性。GMA接枝的PBAT大大提高了RHM与PLA的相容性，这在流变学和差示扫描量热法测试中得到了证实。复合材料的韧性提高了199%-237.6%，同时保持了较好的刚度和降解性。这项工作提出了一种简单有效的策略来制备低成本、刚度和韧性平衡良好的PLA，从而扩大了PLA的应用范围。
