Multifunctional coating on magnesium alloy: Superhydrophobic, self-healing, anti-corrosion and wear-resistant

Dynamical behaviors of water drop impact on superhydrophobic surfaces with the macro-textured cavity

With the increasing demand for high-performance damping rubber material in various fields, improving the damping performance of existing nonpolar rubber has garnered tremendous scientific and industrial interest. However, it remains a long-standing challenge to improve the damping properties of nonpolar rubber materials due to their low intrinsic glass transition temperature (Tg) and incompatible surface energy with high-damping polar polymers or fillers. To solve this conundrum, ultra-low gel multifunctional carboxy-functional high vinyl polybutadiene HVBR (HVBR/COOH-x%) was prepared by grafting 3-mercaptopropionic acid (3PMA) onto HVBR via thiol−ene photo−click. The effects of reaction parameters including molecular weight, 1,2-vinyl content, photoinitiators, reaction time, thiol and photoinitiator dosage on gel content and carboxyl grafting ratio were investigated. The HVBR/COOH-x% demonstrate a controllable grafting ratio range from 2% to 73%. Furthermore, the increased Tg and intermolecular force resulted in excellent performance, including high-glass transition temperature of 26.3°C, tensile strength of 15.52 MPa, and elongation at break of 396.16%. Particularly with a wide range of effective damping temperatures above 46.6°C. Meanwhile, COOH endowed the HVBR with better self-viscosity, but also equipped it with stronger mutual viscosity. Therefore, this experiment proposes a feasible path to high damping and high adhesion in nonpolar rubber materials. 

F.A. Mohd Khairuddin

Papers

Recent progress in superhydrophobic rubber coatings