Passive thermal management (PTM) materials that can stabilize long-duration temperature are highly desirable in thermal insulation applications such as building insulation, infrared stealth, and protection of electronic devices. Here, we proposed a facile method to prepare PTM materials with improved temperature stabilization performance by foaming a paraffin-based phase change composite with heat-sensitive thermal expansion microspheres (TEMs). For the phase change composite with high paraffin content immobilized by 20 wt% poly(styrene-b-(ethylene-co-butylene)-b-styrene, the addition of 10 wt% TEMs made the porosity up to 92.7% while owned a high energy storage density of 137.8 J/g. The low thermal conductivity (0.045 W m⁻¹K⁻¹) contributed by the high porosity and high phase change enthalpy enabled the resulting materials to exhibit significantly improved PTM performance. The possible applications of our resultant materials in thermal insulation fields such as thermotherapy, infrared shielding and building thermal comfort maintenance were demonstrated through simulation experiments. In view of the low cost, non-toxic raw materials, environmental-friendly and large-scale preparation process as well as the flexible, hydrophobic characteristics, our method and the resultant materials exhibited great potential in thermal insulation applications.

可以长期稳定温度的被动热管理 (PTM) 材料在建筑隔热、红外隐身和电子设备保护等隔热应用中非常受欢迎。在这里，我们提出了一种简便的方法，通过用热敏热膨胀微球 (TEM) 发泡石蜡基相变复合材料来制备具有更高温度稳定性能的 PTM 材料。对于由 20 wt% 聚（苯乙烯-b-（乙烯-共-丁烯）-b-苯乙烯固定的高石蜡含量相变复合材料，添加 10 wt% TEM 可使孔隙率高达 92.7%，同时具有较高的储能密度为 137.8 J/g。低热导率（0.045 W m ^-1 K ^-1) 由高孔隙率和高相变焓贡献，使所得材料表现出显着改善的 PTM 性能。通过模拟实验证明了我们的所得材料在热疗、红外屏蔽和建筑热舒适维护等保温领域的可能应用。鉴于低成本、无毒的原材料、环保和大规模的制备过程以及柔性、疏水的特性，我们的方法和所得材料在保温应用中表现出巨大的潜力。