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以聚乳酸(PLA)切片为原料,通过熔融纺丝和气流牵伸制备了PLA纤维,研究了PLA纤维在物理老化过程中热学性能和力学性能的变化。利用差示扫描量热仪(DSC)和电子万能强力仪分别研究了它们在物理老化过程中的玻璃化转变行为和力学性能变化。结果表明:随着物理老化时间的增加,PLA纤维的DSC升温图谱中出现了2个玻璃化转变区,且玻璃化转变温度逐渐升高;而PLA纤维的强力先增大,老化一定时间后,因PLA分子发生降解强力逐渐减小。
PLA fiber was prepared by melt spinning and air-draft with polylactic acid (PLA) chips. The thermal and mechanical properties of PLA fiber during physical aging were studied. The glass transition behavior and the change of the mechanical properties of the composites during the physical aging process were studied by differential scanning calorimetry (DSC) and electronic universal strength tester respectively. The results showed that with the increase of physical aging time, two glass transitions appeared in the DSC temperature profile of PLA fiber, and the glass transition temperature gradually increased. However, the strength of PLA fiber first increased, and after a certain aging time, Degradation due to PLA molecules decreased.