Baby Monisha, Bhaskaran Soumyamol Panthaplackal, Chandran Maniyeri Satheesh
Cochin University of Science and Technology, Ernakulam 682022, Kerala, India.
Analytical and Spectroscopic Division and Polymers and Special Chemical Division, Vikram Sarabhai Space Centre, Thiruvananthapuram 695022, Kerala, India.
ACS Omega. 2023 Feb 16;8(8):7289-7301. doi: 10.1021/acsomega.2c04163. eCollection 2023 Feb 28.
The attachment phenomena of various hierarchical architectures found in nature, especially underwater adhesion, have drawn extensive attention to the development of similar biomimicking adhesives. Marine organisms show spectacular adhesion characteristics because of their foot protein chemistry and the formation of an immiscible phase (coacervate) in water. Herein, we report a synthetic coacervate derived using a liquid marble route composed of catechol amine-modified diglycidyl ether of bisphenol A (EP) polymers wrapped by silica/PTFE powders. The adhesion promotion efficiency of catechol moieties is established by functionalizing EP with monofunctional amines (MFA) of 2-phenyl ethylamine and 3,4-dihydroxy phenylethylamine (DA). The curing activation of MFA-incorporated resin pointed toward a lower activation energy (50.1-52.1 kJ mol) compared with the neat system (56.7-58 kJ mol). The viscosity build-up and gelation are faster for the catechol-incorporated system, making it ideal for underwater bonding performance. The PTFE-based adhesive marble of the catechol-incorporated resin was stable and exhibited an adhesive strength of 7.5 MPa under underwater bonding conditions.
自然界中发现的各种分层结构的附着现象，尤其是水下附着，已引起人们对开发类似仿生粘合剂的广泛关注。海洋生物因其足部蛋白质化学性质以及在水中形成不混溶相（凝聚层）而表现出惊人的附着特性。在此，我们报告了一种通过液滴模板法合成的凝聚层，它由包裹着二氧化硅/聚四氟乙烯粉末的儿茶酚胺改性双酚A二缩水甘油醚（EP）聚合物组成。通过用2-苯乙胺和3,4-二羟基苯乙胺（DA）的单官能胺（MFA）对EP进行功能化，确定了儿茶酚部分的粘附促进效率。与纯体系（56.7 - 58 kJ/mol）相比，含MFA树脂的固化活化指向更低的活化能（50.1 - 52.1 kJ/mol）。含儿茶酚体系的粘度增加和凝胶化更快，使其成为水下粘结性能的理想选择。含儿茶酚树脂的聚四氟乙烯基粘性液滴在水下粘结条件下稳定且表现出7.5 MPa的粘结强度。
