苎麻落麻纤维增强TPS全降解复合材料力学性能的研究

Study on the mechanical properties of TPS completely biodegradable composites reinforced with ramie noil fibers

以苎麻落麻纤维为增强体,甘油/尿素/山梨醇为复合增塑剂塑化的淀粉为基质,制备全降解复合材料,并研究了纤维长度和纤维含量对复合材料的力学性能的影响。结果表明,苎麻纤维和TPS具有良好的界面结合,复合材料的拉伸强度和模量随着苎麻纤维长度和含量的增加而增加,达到25.14 MPa和1 136.36 MPa,接近于未加入纤维时的2倍,断裂伸长率明显下降,但是纤维含量的增加对断裂伸长率的影响不大。弯曲强度和模量与拉伸强度和模量呈现相似的增长趋势。

The completely biodegradable composites from ramie fibers as reinforcement and starch matrix which was plasticized by glycerol/ urea / sorbitol as the mixed plasticizer were produced,and the effects of fiber length and fiber content on the mechanical properties of composites were studied. The result showed that the interfacial adhesion between thermoplastic starch and ramie fibers. The tensile strength and modu-lus of composites enhanced with the length and content of ramie fibers increase,reached to 25. 14 MPa and 1 136. 36 MPa,which were mainly two times compared to materials with no ramie fibers as reinforce-ment. The elongation at break decreased,but the increasement of fibers content had little effect on the elongation at break. The flexural strength and modulus follow the same trend as tensile strength and modu-lus.