在MGO作为交换反应催化剂的存在下进行PLA/PMMA反应混合
Masoud Komeijani1, Naeimeh Bahri-Laleh2, Zohreh Mirjafary1
1Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran 1477893855, Iran.
Polymers
|April 12, 2025
概括
这项研究通过将其与氧化物纳米颗粒 (MgO NPs) 作为催化剂与聚甲基酸 (PMMA) 混合来增强聚 (乳酸) (PLA) 的性. 由此产生的PLA-PMMA共聚合物显著改善了冲击强度和破裂时的延伸.
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
- 纳米技术纳米技术
背景情况:
- 聚 (乳酸) (PLA) 的局限性阻碍了其广泛应用.
- 聚 (甲基甲酸盐) (PMMA) 可以作为PLA的硬化剂.
- 氧化纳米粒子 (MgO NPs) 可以作为聚合物混合中的催化剂.
研究的目的:
- 通过将其与聚 (甲基甲酸) (PMMA) 混合,提高聚 (乳酸) (PLA) 的机械性能.
- 为了研究氧化物纳米粒子 (MgO NPs) 在PLA/PMMA混合物中的催化作用.
- 了解反应机制和由此产生的共聚合物形成.
主要方法:
- 使用MgO纳米粒子 (NP) 作为催化剂,将聚 (乳酸) (PLA) 与聚 (甲基甲酸盐) (PMMA) 混合在一起.
- 使用扫描电子显微镜 (SEM),差分扫描热量计 (DSC),化流量指数 (MFI),X射线衍射 (XRD) 和传输电子显微镜 (TEM) 的表征.
- 机械测试 (拉力强度,弹性模量,破裂时延长,冲击强度) 和表面分析 (水接触角度).
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- SEM证实了PLA/PMMA混合物与MgONP的良好混合性.
- 机械测试显示,PLA/PMMA与MgONP混合物的破裂时延长 (+60%) 和冲击强度 (+400%) 显著增加.
- DSC表示MgONP改变了玻璃化过渡温度 (Tg) 并降低了PLA的结晶性,化温度 (Tm) 和冷结晶.
- MFI下降,表明粘度降低,水接触角度增加,表明更多的极地表面群.
- XRD和TEM证实NP分散均,结晶性降低.
- DFT计算和实验结果证实,MgO NPs有助于转化,形成PLA-PMMA共聚物.
结论:
- 氧化纳米颗粒 (MgO NPs) 有效催化了PLA和PMMA之间的转化,从而改善了混合性和机械性能.
- 由此产生的PLA-PMMA共聚合物表现出增强的性和无毒性,表明了各种应用的多功能潜力.
- 该研究提供了对反应机制和MgONP在聚合物修饰中的作用的关键见解.
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