Self-healable transparent polymer/salt hybrid adhesive via a ternary bonding effect. Issue 41 (19th October 2020)

• Record Type: Journal Article
• Authors: Zhang, Yuanyuan; Zhang, Ke; Li, Xuanhua; Li, Tong; Ye, Qian; Tan, Li-Li; Wei, Bingqing
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 41(2020)
• Page Start: 21812
• Page End: 21823
• Publication Date: 2020-10-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta06935c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A transparent self-healable hybrid adhesive with multiple functions based on a novel co-existing ternary bridging bond self-healing mechanism. Abstract : Tremendous attention has been focused on the design and fabrication of intrinsic self-healing materials in recent years; however, the fabrication of self-healing materials with high transparency and high adhesion strength is still a challenge. Here, we develop a novel transparent self-healing adhesive with multiple functions by simply blending poly(2-ethyl-2-oxazoline) (PEOZ), poly(4-hydroxy styrene) (PHS), and CaCl2, and discover that the anion Cl − also plays a significant role in accelerating the self-healing process by anion–ligand coordination in the form of hydrogen bonding, which has been seriously neglected in previous work. Unlike the common single metal–ligand coordination approach, the enhancement of self-healing results from novel co-existing ternary bridging bonds: metal–ligand coordination, ionic bond, and anion coordination. The universality of the new concept has been verified with other typical soluble salts MgCl2, NaCl, and Ca(NO3 )2, providing a new dimension in the comprehension of the self-healing mechanisms. As a result, the hybrid shows outstanding multifunctional performance compared with the most recently published self-healable adhesives taking into consideration the transparency ( T 550 = 98.9%), adhesion strength (2.57 MPa), and self-healing efficiency (91%), enabling its application as an optical material, an adhesive and also a conservation material for cultural heritage.