以水和离子液体为相变材料,丙烯酸(AA)和丙烯酰胺(AM)为单体,壳聚糖(CTS)和羧甲基壳聚糖(CMC)为添加剂,磁性石墨烯(GO/Fe₃O₄)为导热纳米填料,通过自由基聚合法辅加外部磁场调控制备了磁性调控离子液体相变凝胶(记作M-FPCM),并研究了磁性调控距离对M-FPCM导热性能的影响。结果表明:磁场调控使GO/Fe₃O₄在M-FPCM中定向排列,有助于凝胶内部生成连续的导热通路;M-FPCM在平行于磁场方向的导热系数达0.543W/(m·K),分别是空白凝胶(记作B-FPCM)和未调控凝胶(记作U-FPCM)的1.54倍和1.36倍;M-FPCM抗压强度达5647kPa,是B-FPCM的2.8倍、U-FPCM的1.38倍。此外,M-FPCM具有适合冷藏产品的低温相变温度(1.35℃)和较高的相变焓值(293.3J/g),经过200次升降温循环后依旧保持稳定的焓值和相变温度。

A magnetically regulated ionic liquid phase-change gel (denoted as M-FPCM) was synthesized via free radical polymerization combined with external magnetic field alignment,using water and ionic liquid as the phase-change materials,acrylic acid (AA) and acrylamide (AM) as monomers,chitosan (CTS) and carboxymethyl chitosan (CMC) as additives,and magnetic graphene (GO/Fe₃O₄) as thermally conductive nanofillers.The effects of magnetic regulation distance on the thermal conductivity of M-FPCM were systematically investigated.Results demonstrated that magnetic field alignment induced directional arrangement of GO/Fe₃O₄,facilitating the formation of continuous thermal conduction pathways.The M-FPCM exhibited a thermal conductivity of 0.543W/(m·K) along the magnetic field direction,which was 1.54 times and 1.36 times that of the blank gel (B-FPCM) and unregulated gel (U-FPCM),respectively.Additionally,M-FPCM achieved a compressive strength of 5647kPa,which was 2.8 times and 1.38 times that of the B-FPCM and U-FPCM,respectively.The gel also displayed a low phase-change temperature (1.35℃) suitable for refrigerated products and a high latent heat value (293.3J/g),and still maintained stable enthalpy value and phase-change temperature after 200 heating-cooling cycles.