Quantity or Quality: Are Self-Healing Polymers and Elastomers Always Tougher with More Hydrogen Bonds?
Quantity or Quality: Are Self-Healing Polymers and Elastomers Always Tougher with More Hydrogen Bonds?
复制标题
DOI：
10.1021/acsapm.9b01095
复制
发表时间：
2020-03-01
影响因子：
5
通讯作者：
Konkolewicz, Dominik
中科院分区：
文献类型：
--
作者：
Cummings, Sean C.;Dodo, Obed J.;Konkolewicz, Dominik
含有动态键的聚合物材料具有许多潜在的应用，包括具有长寿命的粘合剂、弹性体和涂料。研究了互穿网络（IPN），其中一个网络具有共价连接体，另一个网络具有动态四氢键2-脲基-4 [1H]-嘧啶酮（UPy）连接体。IPN通常具有优于每个组分网络的上级机械性能。IPN具有非极性聚（丙烯酸乙酯）（PEA）或富含氢键的聚（丙烯酸2-羟乙酯）（PHEA）基质。虽然PHEA材料具有更多的氢键，但自愈合，韧性和断裂能比PEA系统差。这表明，对于需要韧性的应用，如高性能涂料、密封剂或弹性体，应选择强而动态的氢键，即使以总氢键为潜在代价。
Polymer materials containing dynamic bonds have many potential applications including adhesives, elastomers, and coatings with long lifetimes. Interpenetrated networks (IPNs) were studied, where one network had covalent linkers, and the other network had dynamic quadruple-hydrogen-bonded 2-ureido-4[1H]-pyrimidinone (UPy) linkers. IPNs typically have superior mechanical properties to each component network. IPNs had either nonpolar poly(ethyl acrylate) (PEA) or hydrogen-bond-rich poly(2-hydroxyethyl acrylate) (PHEA) matrixes. Although the PHEA materials have more hydrogen bonds, the self-healing, toughness, and fracture energies were poorer than the PEA systems. This suggests that strong and dynamic hydrogen bonds, even at the potential expense of total hydrogen bonds, should be chosen for applications that require toughness such as high-performance coatings, sealants, or elastomers.