在物理衰老过程中聚 (l-乳酸) 的微观结构和性能演变:成型方法在β放松过程中的可确定作用
Zhi-Xuan Zhang1, Chao-Qun Wu1, An-Yan Wang1
1School of Chemistry, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
International journal of biological macromolecules
|February 9, 2025
概括
在聚 (L-乳酸) (PLLA) 中的物理衰老通过改变分子放松而影响其延展性. 杀PLLA可以暂时减缓这种老化过程,提高材料性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 生物材料是一种生物材料.
背景情况:
- 聚 (L-乳酸) (PLLA) 是一种可生物降解的聚合物,对于减少微塑料污染至关重要.
- 聚合物经历物理衰老,改变微观结构和性能,特别是PLLA,但机制尚不清楚.
研究的目的:
- 在身体衰老期间研究PLLA的延展性和放松行为之间的关系.
- 澄清成型方法对PLLA物理老化和机械性能的影响.
主要方法:
- 基于成型方法 (杀与冷压) 的PLLA延展性的比较分析.
- 研究分子链纠及其与放松过程 (α和β-放松) 的相关性.
- 评估物理衰老的可逆性和火对延缓衰老的影响.
主要成果:
- 化的PLLA样本比冷压样本具有更高的抗拉柔性.
- 凝聚性纠形式与老化时间,受成型方法的影响.
- 纠限制了β放松,减少了分子链的移动性和能量吸收能力.
- 物理衰老是不可逆转的,但火提供了一个暂时的延迟效应.
结论:
- 身体衰老通过受限制的分子放松,特别是β-放松,显著影响PLLA延展性.
- 造方法极大地影响纠形成和随后的材料特性.
- 火处理可以作为一种策略来管理PLLA的身体衰老,以提高性能.
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