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A novel 3D-printable hydrogel with high mechanical strength and shape memory properties†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-11-07 , DOI: 10.1039/c9tc04945b Qiang Zhou 1, 2, 3, 4, 5 , Kaixiang Yang 1, 2, 3, 4, 5 , Jiaqing He 1, 2, 3, 4, 5 , Haiyang Yang 1, 2, 3, 4, 5 , Xingyuan Zhang 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-11-07 , DOI: 10.1039/c9tc04945b Qiang Zhou 1, 2, 3, 4, 5 , Kaixiang Yang 1, 2, 3, 4, 5 , Jiaqing He 1, 2, 3, 4, 5 , Haiyang Yang 1, 2, 3, 4, 5 , Xingyuan Zhang 1, 2, 3, 4, 5
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The three-dimensional (3D)-printing of hydrogels with excellent mechanical properties has attracted extensive attention owing to their potential applications in many fields. Through the photoinitiated copolymerization of methacrylic acid (MAAc) and N-(pyridin-2-yl)acrylamide (NPAM) in dimethylsulfoxide (DMSO), a copolymer solution was prepared; it was then 3D printed at 70 °C followed by solvent replacement of DMSO with water at 25 °C, and a novel 3D-printed tough hydrogel was prepared. In the presence of water, NPAM could undergo “multi-fold” hydrogen bonding with MAAc. Thus, the hydrogen bonding is strengthened and stabilized by the hydrophobic α-methyl of MAAc and the pyridine N-heterocycle of NPAM, meaning that the modules of the hydrogel can be up to five times stronger than the original organogels. The swelling or shrinkage of the gel is negligible during solvent replacement and the resultant hydrogel exhibits excellent mechanical properties, with an elastic modulus of 1.8–66 MPa, a tensile fracture stress of 2.2–6.3 MPa, a fracture strain of 360–570% and a fracture energy of 0.5–7.2 kJ m−2. In addition, owing to the dynamic nature and temperature sensitivity of the hydrogen bonds, the hydrogel also exhibited fast self-recovery abilities and temperature activated shape memory properties. In particular, the hydrogen-bonding hydrogel could be quickly degraded and recovered by adjusting the pH, which allowed convenient recycling of the hydrogels. Our experimental results indicated that the combination of a 3D-printing technique and solvent replacement may provide a novel and effective method to obtain 3D-printed hydrogels with high mechanical strength and shape recovery properties, fostering their use in a number of fields such as soft robots, implant devices, tissue engineering and other environment friendly materials.
中文翻译：
具有高机械强度和形状记忆特性的新型3D可打印水凝胶†
具有优异机械性能的水凝胶的三维（3D）打印由于其在许多领域中的潜在应用而引起了广泛的关注。通过甲基丙烯酸（MAAc）和氮的光引发共聚-在二甲亚砜（DMSO）中的-（吡啶-2-基）丙烯酰胺（NPAM），制备共聚物溶液；然后在70°C下进行3D打印，然后在25°C下用水代替DMSO，从而制备了新颖的3D打印坚韧水凝胶。在水的存在下，NPAM可能会与MAAc发生“多重”氢键键合。因此，通过MAAc的疏水性α-甲基和NPAM的吡啶N-杂环加强和稳定了氢键，这意味着水凝胶的模块强度可以比原始有机凝胶强5倍。在更换溶剂期间，凝胶的溶胀或收缩可忽略不计，所得水凝胶显示出优异的机械性能，弹性模量为1.8-66 MPa，拉伸断裂应力为2.2-6.3 MPa，断裂应变为360-570％，断裂能为0.5–7。−2。另外，由于氢键的动态性质和温度敏感性，水凝胶还表现出快速的自恢复能力和温度激活的形状记忆特性。特别地，通过调节pH可以快速降解并回收氢键水凝胶，这允许水凝胶的方便回收。我们的实验结果表明，将3D打印技术与溶剂替代相结合可以为获得具有高机械强度和形状恢复特性的3D打印水凝胶提供新颖有效的方法，从而促进其在许多领域的应用，例如软机器人，植入装置，组织工程和其他环保材料。
更新日期：2019-12-05
中文翻译：
具有高机械强度和形状记忆特性的新型3D可打印水凝胶†
具有优异机械性能的水凝胶的三维（3D）打印由于其在许多领域中的潜在应用而引起了广泛的关注。通过甲基丙烯酸（MAAc）和氮的光引发共聚-在二甲亚砜（DMSO）中的-（吡啶-2-基）丙烯酰胺（NPAM），制备共聚物溶液；然后在70°C下进行3D打印，然后在25°C下用水代替DMSO，从而制备了新颖的3D打印坚韧水凝胶。在水的存在下，NPAM可能会与MAAc发生“多重”氢键键合。因此，通过MAAc的疏水性α-甲基和NPAM的吡啶N-杂环加强和稳定了氢键，这意味着水凝胶的模块强度可以比原始有机凝胶强5倍。在更换溶剂期间，凝胶的溶胀或收缩可忽略不计，所得水凝胶显示出优异的机械性能，弹性模量为1.8-66 MPa，拉伸断裂应力为2.2-6.3 MPa，断裂应变为360-570％，断裂能为0.5–7。−2。另外，由于氢键的动态性质和温度敏感性，水凝胶还表现出快速的自恢复能力和温度激活的形状记忆特性。特别地，通过调节pH可以快速降解并回收氢键水凝胶，这允许水凝胶的方便回收。我们的实验结果表明，将3D打印技术与溶剂替代相结合可以为获得具有高机械强度和形状恢复特性的3D打印水凝胶提供新颖有效的方法，从而促进其在许多领域的应用，例如软机器人，植入装置，组织工程和其他环保材料。
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