聚乳酸的长期热稳定 聚乳酸的长期热稳定
Jannik Hallstein1, Elke Metzsch-Zilligen1, Rudolf Pfaendner1
1Division Plastics, Fraunhofer Institute for Structural Durability and System Reliability LBF, 64289 Darmstadt, Germany.
Materials (Basel, Switzerland)
|June 19, 2024
概括
聚乳酸 (PLA) 对于技术用途需要增强的热稳定性. 使用亚齐里丁和酸的水解稳定,显著扩展了PLA.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 聚乳酸 (PLA) 是一种具有越来越多应用的可生物降解聚合物.
- 它在苛刻的技术应用中的使用受到长期热稳定性不足的限制.
- 了解PLA的降解机制对于制定有效的稳定策略至关重要.
研究的目的:
- 为了研究聚乳酸 (PLA) 在固态阶段的热衰老行为.
- 为了确定PLA在热应力下的主要降解机制.
- 评估和制定有效的稳定策略,以提高PLA的长期耐用性.
主要方法:
- 在100°C和150°C的PLA上进行了固相热老化实验.
- 核磁共振 (NMR) 光谱被用来分析降解产物和机制.
- 测试了各种稳定剂,包括抗氧化剂和水解抑制剂.
主要成果:
- 水解降解,而不是氧化降解,被确定为PLA热衰老的主要机制.
- 抗氧化剂 (,酸盐,乙烯) 在老化稳定性方面只提供了有限的改善.
- 一种基于亚齐里丁的水解抑制剂和酸联合稳定剂的添加组合显著延长了PLA的耐用性.
结论:
- 为了有效地稳定PLA对抗热老化,需要解决水解性降解问题.
- 以亚齐里丁为基础的水解抑制剂与甲合稳定剂相结合,为提高PLA长期性能提供了一个有希望的策略.
- 稳定型PLA在100°C的降解耐受性增加了四倍,使用寿命从500小时延长到2000多小时.
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