基于多重氢键构筑可再生纤维素/液态金属复合弹性体

[Objective]Fabrication of sustainable,mechanically robustness and reproducible metal polymer composite elastomer is desirable but remains a challenge.Herein,a multiple hydrogen bonds crosslinked metal polymer composite elastomer derived from cellulose,plant oil,nature rubber and liquid metal was prepared,which exhibited excellent mechanical elasticity,reproducible and photothermal conversion performance.[Method]In this study,the proposed composite elastomer was fabricated by dispersing the liquid metal(LM)droplets within a mixture of amino cellulose(AC),pimelic acid modified epoxy soybean oil(ESOPA)and nature rubber matrix through high-frequency ultrasonication.And the mechanical properties,recyclability and photothermal conversion performance of liquid metal composite elastomer were analyzed by tensile tests and simulated sunlight irradiation.[Result]1)To fabricate the proposed composite elastomer,the liquid metal(LM)droplets were dispersed within a mixture of amino cellulose(AC),pimelic acid modified epoxy soybean oil(ESOPA)and nature rubber matrix through high-frequency ultrasonication.The active groups of the AC and ESOPA were able to not only construct a multiple hydrogen bonds network,but also stabilize the LM particles.2)The multiple hydrogen bonds network endows the composite elastomer with excellent mechanical strength(1.51 MPa)and stretchability(515.3%).3)With the broken and reconstruction of the multiple hydrogen bonds network,the composite elastomer could be healed quickly at room temperature with high self-healing efficiency of 97.28%after healing 3 h.4)The multiple hydrogen bonds crosslinked composite elastomer has weaker bond energy and better solubility in organic solvents than covalent crosslinked composites,which provided great convenience for the reproduction of the LM-based composite elastomer and the recycling of LM in the waste composite elastomers,and the recycling efficiency of LM was up to 85%.5)Most importantly,the NR/ESOPA/AC/LM composite elastomer possessed stable photothermal conversion property,and has been successfully applied to convert light energy to thermal,electric and kinetic energy to drive the Stirling motor and electric fan,which paved a promising strategy for clean energy collection and conversion.[Conclusion]The abundant active groups were able to stabilize the LM and construct a multiple hydrogen bonds network.The multiple hydrogen bonds crosslinked bio-based composites elastomer derived from AC,ESOPA and NR exhibited excellent mechanical properties,reproducible ability,and photothermal conversion performance.