导热增强聚氨酯基柔性定形相变材料的制备及性能

Preparation and properties of thermal conductivity enhanced polyurethane based flexible and form-stable phase change materials

摘要:

以聚乙二醇（PEG10000）和氨丙基封端的聚二甲基硅氧烷（APDMS）为软段，以甲苯-2,4-二异氰酸酯（TDI）为硬段，以碳纳米管（CNTs）作为功能性材料，一锅法制备了导热增强的聚氨酯基柔性定形相变材料（PU/APDMS/CNTs）。用FTIR、XRD、DSC和TGA等对材料的结构特征和热性能进行了表征。当APDMS含量为10 wt%时，PU/APDMS/CNTs的相变焓值为88.3 J/g，该相变材料在200℃内不发生热分解，具有良好的热稳定性和定形效果，加入5 wt% CNTs的柔性定形相变材料，能够实现光热转换和热能存储，其光热转换和热能存储效率为62.8%，与未加入CNTs的相变材料相比，导热性能明显增强，其升降温速率提高了2.75倍。

Abstract:

Polyurethane based flexible form-stable phase change materials (PU/APDMS/CNTs) with enhanced thermal conductivity were prepared by one-pot method using polyethylene glycol (PEG10000) and aminopropyl terminated polydimethylsiloxane (APDMS) as soft segments, toluene 2, 4-diisocyanate (TDI) as hard segments, and carbon nanotubes (CNTs) as functional materials. The structural characteristics and thermal properties of the materials were characterized by FTIR, XRD, DSC and TGA. When the content of APDMS is 10 wt%, the enthalpy of phase change of PU/APDMS/CNTs is 88.3 J/g. The PCM does not undergo thermal decomposition at 200℃, and has good thermal stability and figuration performance. The composite phase change material with 5 wt% carbon nanotubes can realize photothermal energy conversion and thermal energy storage with an efficiency is 62.8%. Compared with the phase change material without carbon nanotubes, the thermal conductivity is significantly enhanced and the heating and cooling temperature rate is increased by 2.75 times.