A combined strategy of room-temperature plasma activation and chemical treatment to toughen the interfacial adhesion of fluoropolymers

摘要

Fluoropolymers (FPs) have been widely applied as adhesives because of their desirable physicochemical stability and mechanical robustness in a wide range of working temperatures. However, their interfacial adhesion properties are limited due to the absence of strong binding motifs. Herein, hydrogen-bonding (HB) interactions have been incorporated into FPs to toughen their interfacial adhesion. A kind of tailored HB-functionalization for FPs has been proposed, which combines room-temperature plasma activation and subsequent chemical pro-cessing. The improvement of interfacial adhesion has been evaluated from both experimental measurements and molecular dynamics simulations. As a proof of demonstration, the interfacial adhesion strength between FPs and 1,3,5-trinitro-2,4,6-triaminobenzene (TATB) present an increase from 26 kPa to 45 kPa as a result of HB modification. The HB interactions have been proved to facilitate the mechanical strength enhancement for their composites, and an improvement over 20 % was observed for fracture strain, strength and modulus values. Therefore, HB interactions are effective to toughen the interfacial adhesion of FPs, and such tailored HB-functionalization method can be applied to various composite systems with tunable adhesion properties appreciated therein.

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