Anticorrosive coatings are extensively investigated as a potential solution to prevent or at least retard metal corrosion occurrence. However, the actual breakthrough is still hampered by the risk of barrier properties loss because of the local failure of the coating. Self-healing coatings can effectively repair microcracks, but outstanding self-healing behavior is always accompanied by poor self-cleaning ability. Herein, we report a series of poly(dimethylsiloxane) (PDMS) modified with a terephthalic aldehyde (TA)-polyurea (PDMS-TA-PUa) copolymer with a double reversible dynamic bond crosslinking network structure. The PDMS-TA-PUa coating exhibits fast and re-recycled self-healing behavior that heals cracks within 40–50 min at room temperature. The fast self-healing property is attributed to the dynamic nature of the imine bonds and hydrogen bonds in polymer networks. The PDMS-TA-PUa coating also shows great self-cleaning and anticorrosive ability, due to high hydrophobic, low surface energy, and high corrosion potential. Our work gives an insight into the design and preparation of multifunctional coating material with excellent anticorrosion performance, fast self-healing, and self-cleaning properties.
In this work, a self-healing elastomer involving reversible imine bonds was synthesized by Schiff base reaction between the amino groups in amino-modified polydimethylsiloxane (APDMS) and the aldehyde groups in 1,4-diformylbenzene (DFB). The incorporation of amino-modified multi-walled carbon nanotube (AMWCNT) allowed for good dispersion of AMWCNT with few aggregates and effectively balanced the mechanical properties and self-healing performance, achieving a mechanical strength of 132.3 kPa and a self-healing efficiency ( HE ) of 99.87% at room temperature after 24 h. The reversible imine bond based on the Schiff base linkage promotes quick self-healing upon damage without any external stimulus at room temperature. Through electroless deposition, copper and nickel patterns were formed on the surface of the elastomer, establishing conductive pathways. The average resistivity of the copper trace was 5.40 × 10 −8 Ω·m (3.63 × 10 −7 Ω·m for nickel trace), which is 3.18 times that of regular copper wire (5.19 times for regular nickel wire). Upon cleavage and self-healing of the elastomer with copper lines, with the resistivity increment by 14.43% in average (11.01% for nickel wire). This work offers an alternative pathway to the development of self-healable silicone elastomers for future flexible electronics. Highlights Elastomer with balanced mechanical properties and self-healing performance. Recyclable elastomer through hot-press treatment. Copper patterns were electroless-deposited on the elastomer. Damaged pattern restored conductivity within 24 h at room temperature.
危险品化学品经营许可证（带存储）