通过使用新型稳定剂组合,提高聚乳酸的水解稳定性
Jannik Hallstein1, Elke Metzsch-Zilligen1, Rudolf Pfaendner1
1Fraunhofer Institute for Structural Durability and System Reliability LBF, Division Plastics, 64289 Darmstadt, Germany.
Polymers
|February 24, 2024
概括
一种新的亚齐里丁衍生物提高了对水解的聚乳酸稳定性,显著优于商业稳定剂. 这一突破使得聚乳酸 (PLA) 能够通过提高其寿命和热性能来实现持久的应用.
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:
- 商用聚乳酸 (PLA) 由于水解稳定性差,在耐用应用中使用有限.
- 现有的稳定剂往往无法提供对水解的长期保护.
研究的目的:
- 研究一种基于阿齐里丁衍生物的新型水解抑制剂,以改善PLA的水解稳定性.
- 评估一种含有阿齐里丁衍生物和酸清除剂的新型稳定剂组合.
- 将这些新型稳定剂的性能与商业替代品进行比较.
主要方法:
- 在水中在高温下 (接近其玻璃过渡温度) 加速液分解老化PLA.
- 在老化过程中监测融体积率 (MVR) 和分子量.
- 核磁共振 (NMR) 光谱学以阐明稳定机制.
主要成果:
- 这种新型的亚齐里丁衍生物和稳定剂成分表现出优异的水解稳定性,超过了商业聚合物碳二胺.
- 用新型抑制剂稳定了PLA,在850小时后分子量仅下降了10%,在1200小时后降低了20%.
- 商用聚碳胺稳定剂在显著更短的时间 (300小时) 中导致了相似的分子量减少.
- 核磁共振分析证实了阿齐里丁衍生物的稳定机制,无论是单独的还是与酸.
结论:
- 基于亚齐里丁衍生物的新型水解抑制剂和稳定剂成分显著增强了聚乳酸的水解稳定性.
- 这些新型稳定剂的性能优于商业替代品,如聚合物碳二胺.
- 增强的水解稳定性和改进的热性能使得PLA适用于更苛刻,更耐用的应用.
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