通过可控分子松弛定制聚(L-乳酸)单丝的结构主导机械特性

Jin Bo Liu, Chen Zhang, Xue Hu, Jie Cheng, Zhong Hua Ni, Gu Tian Zhao
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摘要

具有定向分子结构的高性能聚乳酸(PLLA)单丝的可控机械性能可拓宽其应用领域,尤其是在生物医学领域。本文采用不同的热处理方法来调节取向聚乳酸单丝的分子松弛程度,从而调整其机械性能。这些单丝是通过熔融纺丝和固态拉伸工艺制成的。然后,对它们进行不同的热处理,包括退火、正火和淬火。随着冷却时间的延长,长丝中出现了明显的分子取向损失,并有规律地增加,最大可达约 35.1%。然而,仅在晶相中的分子受到的影响有限。因此,这些长丝的机械性能在热处理后也发生了相应的变化。杨氏模量和断裂伸长率在经过各种后处理后都有所提高,并随着冷却时间的延长而逐渐增加。但断裂强度的变化却截然不同。这说明不同的热处理可以通过改变取向结构有效地控制取向聚乳酸材料的力学性能。
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Tailoring Structure-Dominated Mechanical Properties of Poly(L-Lactide Acid) Monofilaments via Controllable Molecular Relaxation
Controllable mechanical properties of highly performed Poly (L-lactide acid) (PLLA) monofilaments with oriented molecular structure could widen their applications, especially in biomedical field. Herein, different heat treatments were applied to regulate the degree of molecular relaxation of oriented PLLA monofilaments to tune their mechanical properties. These filaments were manufactured by melting spun and solid-state drawing processes. Then, they were processed by different heat treatments, including annealing, normalizing, and quenching. As the cooling time extension, an obvious molecular orientation loss in filaments happened and increased regularly, and it could reach up to about 35.1% maximumly. However, molecules only in crystal phase were limitedly affected. As a result, mechanical performances of these filaments exhibited a corresponding change after heat treatments. Young’s modulus and elongation at break were promoted after all kinds of post-processes and increased with longer cooling time gradually. But breaking strength showed a contrast change. It means that different heat treatments could be effective avenues to control mechanical properties of oriented PLLA materials by altering the orientation structure.
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