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Effects of amphiphilic monomers and their hydrophilic spacers on polyacrylamide hydrogels

机译：两亲性单体及其亲水性间隔基对聚丙烯酰胺水凝胶的影响

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Hydrogels based on physical interactions have been extensively studied due to their special network structure and excellent mechanical properties. In this paper, a series of hydrogels based on hydrophobic interactions were prepared via the free-radical copolymerization of acrylamide and polymerizable amphiphilic monomers dodecanol polyoxyethylene ( n ) acrylates (AEO- n -AC, n = 3, 7, 9, 15, 23) by a simple and facile method. The prepared single-network hydrogels cross-linked by the self-assemble AEO- n -AC micelles acting as cross-linkers exhibited great tensile strength of 0.45 MPa and excellent compression strength of 4.5 MPa. Transmission electron microscopy tests reflected that the morphologies of the self-associated micelles were determined by the hydrophilic segment of the amphiphilic monomers, which further affected the mechanical properties of the hydrogel. Amphiphilic monomer with appropriate length of hydrophilic spacers could significantly enhance the tensile strength of the hydrogel. Meanwhile, amphiphilic monomers with long hydrophilic segment were advantageous for the compression properties of the hydrogel. Furthermore, the hydrogels exhibited excellent micro self-repair ability during the cycling tensile and loading-unloading test even at the strain and compression were 400%, 0.95, respectively. This discover of hydrophilic spacer effect is of great significance for the design of physical interaction-based hydrogels with high strength and compression properties.
机译：由于其特殊的网络结构和出色的机械性能，基于物理相互作用的水凝胶已经得到了广泛的研究。在本文中，通过丙烯酰胺与可聚合的两亲单体十二醇聚氧乙烯（n）丙烯酸酯（AEO- n -AC，n = 3、7、9、15、23）的自由基共聚反应，制备了一系列基于疏水相互作用的水凝胶。 ），方法很简单。通过作为交联剂的自组装AEO-n -AC胶束交联的制备的单网络水凝胶表现出0.45 MPa的抗拉强度和4.5 MPa的优异抗压强度。透射电子显微镜测试表明，自缔合胶束的形态由两亲单体的亲水链段决定，这进一步影响了水凝胶的机械性能。具有适当长度的亲水间隔基的两亲性单体可以显着增强水凝胶的拉伸强度。同时，具有长亲水链段的两亲性单体对于水凝胶的压缩性质是有利的。此外，即使在应变和压缩分别为400％，0.95的情况下，水凝胶在循环拉伸试验和加载/卸载试验中也显示出优异的微观自修复能力。亲水间隔基效应的发现对于设计具有高强度和压缩性能的基于物理相互作用的水凝胶具有重要意义。

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