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具有结网络连接点的高分子凝对强刺激有反应

Mingyu Guo¹, Louis M Pitet, Hans M Wyss

¹Institute for Complex Molecular Systems, ‡Laboratory of Chemical Biology, §Department of Chemistry and Chemical Engineering, ∥Department of Mechanical Engineering, Eindhoven University of Technology , P.O. Box 513, NL 5600 MB Eindhoven, The Netherlands.

Journal of the American Chemical Society

|May 8, 2014

概括

研究人员使用聚乙烯糖醇 (PEG) 网络中的2-ureido-4[1H]-pyrimidinone (UPy) 交叉链接开发出了坚固,弹性的水凝. 这些材料表现出可调节的机械性能和形状记忆效果,提供了多功能应用.

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
生物材料工程生物材料工程

背景情况:

水凝是水膨胀的聚合物网络,具有多样化的应用.
开发具有增强机械性能和刺激响应行为的水凝对于先进材料至关重要.

研究的目的:

为了合成和表征新的水凝,利用特定的键单元进行物理交叉链接.
研究聚合物结构和交叉链密度对水凝机械性能的影响.
探索这些水凝系统中形状记忆行为的潜力.

主要方法:

用2-ureido-4[1H]-pyrimidinone (UPy) 键单元和聚乙烯糖醇 (PEG) 分段合成细分的两性宏分子.
电子显微镜验证纳米物理交叉连接和微相分离.
机械测试用于评估强度,弹性和PEG链长度的影响.
微分扫描热量计用于研究热过渡及其与形状记忆的关系.

主要成果:

水凝通过UPy-UPy二元体在疏水域内形成稳定的纳米物理交叉链接.
材料呈现出高含水量 (w(H2O) ≈0.8) 和根据PEG链长度调节的机械性能.
由于微相分离网络结构,水凝表现出显著的强度和弹性.
聚乙烯甘醇 (PEG) 化过渡被确定为形状记忆行为的有效刺激.

结论:

UPy交联的PEG水凝提供了一个强大的平台,用于创建坚固,弹性和对刺激有反应的材料.
合成策略允许可调节的机械性能和易于加工.
这些水凝对要求高性能和适应能力的应用有很大的希望,包括形状记忆材料.

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