聚胺的机械复原:移动无形相的关键作用
Shenying Sun1, Wei Huang1, Jian Zhou1
1Zhejiang Key Laboratory of Bio-based Polymeric Materials Technology and Application, Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Materials Technology and Engineering (NIMTE), CAS, Ningbo, 315201, P. R. China.
Macromolecular rapid communications
|February 27, 2025
概括
通过化前拉伸进行机械复原,可以防止在物理衰老过程中无形聚酸 (PLA) 变脆. 这一过程通过影响移动无形相分数来保持延展性,这对于玻璃聚合物硬化至关重要.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 像聚酸 (PLA) 这样的无形聚合物经历物理衰老,导致脆化和限制实际应用.
- 通过化前拉伸的机械再生是一种潜在的方法来抵消因衰老而引起的脆性.
- 在老化过程中,预拉伸的PLA中控制硬化效应的精确机制尚未完全理解.
研究的目的:
- 研究化前拉伸在物理衰老过程中增强无形聚酸 (PLA) 延展性的机制.
- 阐明无形相结构和动态在防止脆化中的作用.
- 确定控制老化玻璃聚合物从柔性转变为脆性的关键参数.
主要方法:
- 使用聚乙烯 (PLA) 与12%的D-异构体单位,以确保完全无形状态,消除晶体或中相影响.
- 应用了化前拉伸,以创建定向的无形样本.
- 预先拉伸和同位素样本均经过物理衰老.
- 采用热分析来研究无形阶段和细分移动性的变化.
主要成果:
- 预拉伸的无形PLA样本在物理老化后保留了柔性,与变得脆的同位素样本不同.
- 热分析表明,移动无形相 (XMAF) 的部分在老化过程中显著影响延展性.
- 确定了XMAF的关键值,确定了从柔性转变为脆性的行为.
结论:
- 化前拉伸有效地使无形PLA再生,在物理老化过程中保持延展性.
- 由XMAF量化的无形细分移动性,是调节衰老反应和从柔性到脆性的过渡的主要因素.
- 了解这些机制为老化玻璃型聚合物的硬化策略提供了见解.
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