循环聚乳酸/亚摩尔聚酸酸混合物的性能
Simran Chatrath1, Mansour Alotaibi1, Carol Forance Barry1
1Department of Plastics Engineering, University of Massachusetts Lowell, Lowell, MA 01879, USA.
Polymers
|May 11, 2024
概括
回收聚乳酸 (PLA) 和其与无形聚酸酸盐 (aPHA) 的混合物,保持了可生物降解包装的关键性质. 混合物显示了将回收材料纳入热成型包装应用中的希望.
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
- 可持续材料 可持续材料
背景情况:
- 聚乳酸 (PLA) 是一种可生物降解的聚合物,具有包装应用的潜力.
- 由于PLA的脆性限制了它的使用;与无形多酸酸盐 (aPHA) 混合可以提高灵活性.
- 研究回收对PLA和PLA/aPHA混合物的影响对于可持续的材料利用至关重要.
研究的目的:
- 评估多个热历史 (回收) 对整洁PLA和PLA/aPHA混合物的机械,质和热性能的影响.
- 确定再生PLA及其混合物适用于可生物降解包装应用的适用性.
- 在单螺杆挤出机中经过五个再加工周期后评估性能变化.
主要方法:
- 准备整洁的PLA和PLA/aPHA混合物 (90重量%和75重量%的PLA).
- 使用单螺丝挤出机将材料 subjected to five heat histories. 用单螺丝挤出机将材料 subjected to five heat histories. 使用单螺丝挤出机将材料 subjected to five heat histories. 使用单螺丝挤出机将材料 subjected to five heat histories. 使用单螺丝挤出机将材料 subjected to five heat histories.
- 机械 (拉力,冲击强度) 特性,学 (复杂粘度) 和热性 (分解,玻璃过渡,化,结晶性) 特性.
主要成果:
- 在回收的100%PLA和75%PLA混合物中,分解行为保持相似,但在具有热循环的90%PLA混合物中降低.
- 玻璃过渡和化温度不受再加工的影响;晶度随热循环而增加.
- 复杂粘度在再加工后显著下降,在多个循环后100%的PLA和90%的PLA混合物下降更小. 75%的PLA混合物在2-5个周期后没有观察到任何变化.
- 拉伸性能没有受到影响,但75%的PLA混合物在再加工后的冲击强度下降.
结论:
- 回收PLA和PLA/aPHA混合物保留了适用于热成型包装的特性.
- 75%的PLA混合物在回收后显示出冲击强度的下降,而其他特性在很大程度上保持稳定.
- 这些发现支持将废料纳入整洁树脂,用于制造可生物降解包装,促进循环经济.
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