采用物理共混方法制备了具有交联结构的聚乙二醇(PEG)/聚乙烯醇(PVA)/MXene(MXene是一种由过渡金属碳化物或氮化物构成的二维纳米材料)-氧化石墨烯(GO)柔性复合相变薄膜(记作PA/MX-GOx),通过傅里叶变换红外光谱仪、X射线衍射仪、差示扫描量热仪对其化学结构、官能团、热性能进行表征,研究了复合相变薄膜的柔性、机械强度、光热转换性能和导热性能。结果表明:MXene亲水性纳米材料在提高复合相变薄膜机械强度方面发挥了重要作用,由于MXene纳米片具有丰富的表面官能团,提供了额外的氢键结合位点,从而促进了交联,提高了柔韧性;而GO在提高光热转换效率和导热性能的同时,保持了有效潜热。PA/MX-GO5.0复合相变薄膜初始熔融焓为213.8J/g,经过200次加热冷却循环后,熔融焓为200.4J/g,具有良好的热循环稳定性,光热转换效率达到88.6%;光照时间为60s时,形状恢复率接近100%,表现出良好的光驱动可恢复性。
The cross-linked polyethylene glycol (PEG)/polyvinyl alcohol (PVA)/MXene-graphene oxide (GO) flexible composite phase change films PA/MX-GOx were prepared by physical blending method.Among them,Mxene was a 2D hydrophilic nanomaterial composed of transition metal carbides or nitrides.Their chemical structure,functional groups,and thermal properties were characterized using Fourier Transform Infrared Spectroscopy (FT-IR),X-ray Diffraction (XRD),and Differential Scanning Calorimetry (DSC).The flexibility,mechanical strength,photothermal conversion efficiency,and thermal conductivity of the composite phase change films were investigated.The results showed that the MXene hydrophilic nanomaterial played an important role in improving the mechanical strength of composite phase change films.Because MXene nanomaterials had abundant surface functional groups,they provided additional hydrogen bond binding sites,thus promoting crosslinking and improving flexibility.GO improved photothermal conversion efficiency and thermal conductivity,while maintaining the effective latent heat.The initial fusion enthalpy value of the PA/MX-GO5.0 composite phase change film was 213.8J/g,and after 200 heating-cooling cycles,the fusion enthalpy value was 200.4J/g,demonstrating excellent thermal cycle stability.Moreover,the photothermal conversion efficiency reached 88.6%.Under 60 seconds of illumination,the shape recovery rate approached 100%,indicating outstanding light-driven recoverability.
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基金资助
内蒙古自治区直属高校基本科研业务费项目(2023QNJS060;2023QNJS050);内蒙古自治区重大科技创新示范项目(2023JBGS0012)
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