Phase change materials (PCMs) need to improve thermal conductivity and maintain stability to meet actual application requirements. Here, a novel composite based on hydroxylated boron nitride (BN-OH) as a thermally conductive filler with superior thermal energy storage and shape stability is reported. By combining kapok fiber (KF) and sodium alginate (SA), lightweight KF/SA aerogels were fabricated, and their highly porous but durable three-dimensional networks benefit the encapsulation of polyethylene glycol (PEG) and prevent the leakage of PEG. PCMs are prepared by vacuum-assisted impregnating of PEG into the aerogels. The thermal conductivity of 0.684 W∙m⁻¹∙K⁻¹ at 10 wt% BN-OH is greatly improved because hydroxyl groups cannot only reduce interfacial thermal resistance but form secure thermal conductive networks. In addition, this novel PCMs possesses excellent shape stability and high latent heat of fusion, and the PCMs keep their shapes stable without any leakage even is compressed upon the melting point of PEG.

相变材料（PCM）需要提高热导率并保持稳定性以满足实际应用要求。在此，报道了基于羟基化氮化硼（BN-OH）作为导热填料的新型复合材料，该复合材料具有优异的热能存储和形状稳定性。通过将木棉纤维（KF）和藻酸钠（SA）结合使用，制造了轻质的KF / SA气凝胶，它们的高度多孔但坚固耐用的三维网络有利于聚乙二醇（PEG）的封装并防止PEG泄漏。PCM是通过将PEG真空辅助浸渍到气凝胶中来制备的。导热系数0.684 W∙m ^-1 ∙K ^-1当重量百分比为10％时，BN-OH大大改善，因为羟基不仅会降低界面热阻，而且会形成牢固的导热网络。另外，这种新颖的PCM具有优异的形状稳定性和高熔化潜热，并且即使在PEG的熔点上被压缩，PCM也保持其形状稳定而没有任何泄漏。