在不同加速老化条件下,PLA或PLA/粉复合材料的激活能量与机械性能之间的相关性
Margarita Reit1, Jan-Christoph Zarges1, Hans-Peter Heim1
1Institute of Material Engineering, Polymer Engineering, University of Kassel, Kassel, Germany.
Biopolymers
|February 22, 2024
概括
原生土豆粉增强了聚酸 (PLA) 复合物的稳定性. 这种PLA/粉混合物表现出对老化条件的抗性提高,保持比纯PLA更好的机械性能.
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
- 复合材料 复合材料 复合材料
背景情况:
- 聚酸 (PLA) 是一种可生物降解的聚合物,在各种领域都有潜在的应用.
- 在环境压力下PLA的长期稳定性和机械性能对于其广泛采用至关重要.
- 原生土豆粉可以用作填充剂,以潜在地增强PLA的特性.
研究的目的:
- 调查土著土豆粉添加对聚酸 (PLA) 的机械和热性能的影响.
- 评估激活能量与PLA/粉复合材料在加速老化下的机械和热稳定性之间的相关性.
- 为了确定与纯PLA相比,PLA/粉复合材料的抗降解性.
主要方法:
- 半晶体聚化物 (PLA) 和PLA/50重量%原生土豆粉复合材料的复合和注塑.
- 使用拉力,三点曲和Charpy冲击测试进行机械表征.
- 在加速温度和湿度条件下储存后,使用弗林-沃尔-奥扎瓦法计算激活能量.
主要成果:
- 添加本土土豆粉可以防止在老化过程中在纯PLA中观察到的激活能量下降.
- 与纯PLA相比,PLA/粉复合材料对加速老化条件的抵抗性明显更好.
- 聚乙烯/粉复合材料的机械性能保持在接近初始值的水平,而纯乙烯则显示出显著的偏差 (+63.88%至-33.96%).
结论:
- 原生土豆粉作为PLA中的稳定填充剂,增强其对热和湿度诱导的降解的抵抗力.
- PLA/粉复合材料的稳定激活能量与它们保持的机械性能有很好的相关性.
- 与纯PLA相比,PLA/粉复合材料在各种应用中提供了更稳定,更耐用的材料选择.
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