制备自愈热塑性聚西洛-聚氨/聚-聚氨弹性体混合物,具有同连续的微相结构,并对它们的协同效应进行深入研究
Jinlong Fan1, Jie Zhang1,2
1Key Laboratory of Special Functional Aggregated Materials (Shandong University), Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
ACS applied materials & interfaces
|September 25, 2024
概括
新的聚合物混合物结合了聚烯和聚尿素,提高了机械强度和耐热性. 这些先进的材料表现出协同效应和自我愈合特性,这是由于改进的键网络.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 纳米技术纳米技术
背景情况:
- 聚合物混合对于开发具有协同性能的材料至关重要.
- 实现非极性有机聚合物和极性聚合物的理想混合物仍然具有挑战性.
- 我们对聚合物混合物的协同效应机制的理解是有限的.
研究的目的:
- 为了制备热塑性聚尿素弹性体,它与同连续的微相结构混合.
- 为了研究将聚氨酸纳入聚尿素弹性体中的协同效应.
- 阐明增强机械性能和自我愈合能力背后的机制.
主要方法:
- 使用聚氨酸-聚尿素 (PDMS-PUA),聚乙烯胺-聚尿素 (PEA-PUA) 和一个移植的兼容剂制备混合物.
- 在现场可变温度红外光谱分析 (VTIR) 来研究相间相互作用.
- 微观形态特征分析混合物结构和变形行为.
主要成果:
- 成功创建了共同连续的微相热塑性聚尿素弹性体混合物.
- 加入聚氧并没有损害,但增强了机械性能 (例如,拉伸强度高达25.7MPa).
- 显示出异常的耐热和耐水性,以及自我愈合的能力.
结论:
- 兼容性促进了在接口处更密集的键网络,这对共同连续结构至关重要.
- 协同作用的机械特性源于聚合物相应应力下的共同变形和共同定向.
- 可逆结网负责聚合物混合物中观察到的自我愈合能力.
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