Abstract: In order to develop the fully degradable polylactic acid composites with high performance, the compression moulding technique was adopted to prepare the unidirectional fiber reinforced polylactic acid composites with twisted yarns and untwisted yarns constructed by continuous phosphate glass fiber through twisted ply and untwist ply as he reinforcement. Based on the analysis of the bending property, such methods as scanning electron microscope (SEM), degradation and weight loss as well as pH testing were adopted to analyze the influence of yarn structure and fiber volume content on the mechanical properties and degradation behavior during degradation. The results indicate that the continuous phosphate glass fiber yarns can effectively improve the structural properties of composite materials, while the flexural strength and modulus of the compositesare further decreased by 22% and 10%, respectively, due to twisted structure of yarns. However, during the degradation process, it is found that the mechanical properties of the composite material decline with the degradation of phosphate glass fibres. After 28 days of degradation, the fibers are completely degraded, and the flexural strengthand modulus of the composite material are reduced by 85% and 90%, respectively.

Key words: phosphate glass fiber, fully degradable composites, degradation behavior, mechanical properties

摘要： 为开发高性能全降解聚乳酸复合材料,以连续磷酸盐玻璃纤维通过无捻合股与加捻合股工艺构建的无捻与有捻纱线为增强体,利用模压成型工艺制备单向纤维增强聚乳酸复合材料,并基于弯曲性能分析、扫描电子显微镜(SEM)、降解失重与pH检测等方法,表征不同纱线结构、纤维体积含量对复合材料降解过程中力学性能与降解行为的影响。研究表明:连续磷酸盐玻璃纤维纱线可有效提升复合材料的力学性能,但其弯曲强度与模量受有捻纤维结构影响分别下降22%与10%。然而,降解过程中可见复合材料的力学性能随磷酸盐玻璃纤维的降解而衰减,降解28天后磷酸盐玻璃纤维完全降解,复合材料弯曲强度与模量分别下降85%与90%。

关键词: 磷酸盐玻璃纤维, 全降解复合材料, 降解行为, 力学性能