A Photocured Bio-based Shape Memory Thermoplastics for Reversible Wet Adhesion.
A Photocured Bio-based Shape Memory Thermoplastics for Reversible Wet Adhesion.
复制标题
DOI：
10.1016/j.cej.2023.144226
复制
发表时间：
2023-08
影响因子：
15.1
通讯作者：
Yu-Chung Wu;Changhua Su;Shao-heng Wang;Bujingda Zheng;Alireza Mahjoubnia;Kianoosh Sattari;Hanwen Zhang;J. Meister;Guoliang Huang;Jian Lin
中科院分区：
文献类型：
--
作者：
Yu-Chung Wu;Changhua Su;Shao-heng Wang;Bujingda Zheng;Alireza Mahjoubnia;Kianoosh Sattari;Hanwen Zhang;J. Meister;Guoliang Huang;Jian Lin
可逆湿式或水下粘合剂的开发仍然是一个巨大的挑战，因为水分子减弱的分子间相互作用或/和低有效接触面积导致与湿表面的界面不良，从而显着降低粘合强度。在此，开发了一种新型光固化生物基形状记忆聚合物（SMP），它对各种类型的表面具有化学和结构湿粘附力。 SMP 由三种单体聚合而成，形成带有疏水侧链的线性聚合物链。链中的氢受体和供体基团与表面形成氢键，并受到界面中疏水链的保护。 SMP 显示可调节的相变温度 (Tg) 为 17–38 °C。在高于 Tg 的橡胶状态下，粘合剂与目标表面形成舒适的接触。低于 Tg，向玻璃态的转变会锁定一致的形状，从而大大增加有效接触面积。因此，该粘合剂表现出> 15天的长期水下粘合力，最佳粘合强度约为0.9 MPa。展示了其在泄漏修复、水下皮肤传感器中的应用。这一新的通用策略将为利用可再生原料设计生物基、持久、可逆的粘合剂以实现广泛应用铺平道路。
Development of reversible wet or underwater adhesives remains a grand challenge, because weakened intermolecular interactions by water molecules or/and low effective contact area cause poor interface to the wet surfaces, which significantly decreases adhesive strength. Herein, a new photocured, bio-based shape memory polymer (SMP) that shows both chemical and structural wet adhesion to various types of surfaces is developed. The SMP is polymerized from three monomers to form linear polymer chains dangled with hydrophobic side chains. The hydrogen acceptor and donor groups in the chains form hydrogen bonding with the surfaces, which is protected by the hydrophobic chains in the interface. The SMP shows tunable phase transition temperature (Tg) of 17–38 °C. In a rubbery state aboveTg, the adhesive forms conformable contact with the targeted surfaces. BelowTg, a transition to a glassy state locks the conformed shapes to largely increase the effective contact area. As a result, the adhesive exhibits long-term underwater adhesion of >15 days with the best adhesion strength of ∼0.9 MPa. Its applications in leak repair, underwater on-skin sensors were demonstrated. This new, general strategy would pave avenues to designing bio-based, long-lasting, and reversible adhesives from renewable feedstocks for widespread applications.