摘要
形状记忆水凝胶(SMHs)作为一种智能软材料备受关注.目前复杂的制备工艺和缓慢单一的形状变形阻碍了其在智能柔性驱动器中的应用.本研究以丙烯酰胺(AAm)、α-甲基丙烯酸(MAA)、丙烯腈(AN)为原料,N,N,N',N'-四甲基乙二胺(TEMED)为促进剂,利用氢键和偶极-偶极相互作用的协同效应,简单自由基聚合方法构建了热响应形状记忆超分子水凝胶(P(AMA)).研究结果表明,水凝胶具有高韧性(1.11±0.06MJ/m3),高拉伸强度(0.22±0.02 MPa)和超过1000％的应变.可逆物理交联点的解离和重建赋予了水凝胶优异的热响应形状记忆行为:在10 ℃条件下5min即可固定为临时形状,并在37℃条件下10s内恢复原始形状.本研究构建的P(AMA)形状记忆超分子水凝胶具有易制备、低成本、坚韧和可编程形状变形等优点,在柔性驱动器、软机器人和电子皮肤等领域具有良好的应用前景.
Abstract
Shape memory hydrogels(SMHs),a type of intelligent soft material,have received a lot of attention.However,their applications in smart actuators have been hampered by difficult preparation and slow,single-shape change.As raw ingredients for this experiment,we select acrylamide(AAm),methacrylic acid(MAA),and acrylonitrile(AN),while tetramethyl ethylenediamine(TEMED)serves as an accelerator.Besides,we employ a straightforward polymerization method to create the thermally sensitive shape memory supermolecule hydrogel(P(AMA)),which is produced by synergistically combining dipole-dipole interactions with hydrogen bonds(H-bonds).The resulting hydrogel exhibits a high toughness(1.11±0.06 MJ/m3),strong tensile strength(0.22±0.02 MPa),and significant stretchability(up to 1,000％).Additionally,the hydrogel possesses outstanding temperature-responsive shape memory behavior,which can be fixed in a temporary shape in only 5 min at 10 ℃ and recover to the original shape in 10 s at 37 ℃.This is based on the dissociation and reconstruction of reversible physical crosslinks.The shape memory supramolecular hydrogel created in this work also has the benefits of being easily made,inexpensive,highly durable,and having programmable shape memory,etc.This opens up a wide range of potential applications in actuators,soft robotics,electronic skin,and other areas.
基金项目
国家自然科学基金(51932002)
国家自然科学基金(U22A20160)
广东省自然科学基金(2023A1515011039)
广州市科技计划项目(202102010008)
广州市科技计划项目(2023A03J0383)
维普
万方数据