Imani Kusuma Betha Cahaya, Park Jeongbin, Yoon Jinhwan
Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center, Pusan National University, Busan 46241, Republic of Korea.
Soft Matter. 2024 Jul 24;20(29):5781-5787. doi: 10.1039/d4sm00602j.
Thermal stiffening materials are commonly applied in the aerospace and automotive industries, among others, since their dimensional stabilities and stiffness characteristics improve at high temperatures. In this study, temperature-triggered modulus-tunable hydrogels were prepared by combining Pluronic F-127 with charged polymers. Pluronic F-127, a triblock copolymer micelle, provided three-dimensional printing capabilities of fine resolution with high viscosity, while hydrophobic and ionic interactions among polymer networks provided thermal stiffening. The hydrogel ink's printability was demonstrated by successfully creating complex 3D structures. A calcium ion carrying a hydrophobic propionate and carboxylate group in polymer chains was used to form additional physical crosslinking at high temperature, ultimately leading to the thermal stiffening effect without volume change. The thermal stiffening behavior was found to be fully reversible and repeatable. Finally, to demonstrate the versatility of this work, graphene oxide was added to produce a light-controllable modulus based on its photothermal properties.
热硬化材料常用于航空航天和汽车工业等领域，因为它们在高温下的尺寸稳定性和刚度特性会得到改善。在本研究中，通过将普朗尼克F-127与带电聚合物相结合，制备了温度触发的模量可调水凝胶。普朗尼克F-127是一种三嵌段共聚物胶束，具有高粘度的精细分辨率三维打印能力，而聚合物网络之间的疏水和离子相互作用提供热硬化效果。通过成功创建复杂的3D结构，证明了水凝胶墨水的可打印性。聚合物链中带有疏水丙酸酯和羧酸盐基团的钙离子用于在高温下形成额外的物理交联，最终导致热硬化效果而无体积变化。发现热硬化行为是完全可逆和可重复的。最后，为了证明这项工作的多功能性，添加了氧化石墨烯以基于其光热特性产生光控模量。
