Co-solvent free interfacial polycondensation and properties of polyurea PCM microcapsules with dodecanol dodecanoate as core material

• Published in: Solar energy 2020-03, Vol.199, p.721-730
• Main Authors: Cai, Changwei, Ouyang, Xu, Zhou, Lan, Liu, Guojin, Wang, Yan, Zhu, Guocheng, Yao, Juming, Militky, Jiri, Venkataraman, Mohanapriya, Zhang, Guoqing
• Format: Article
• Language: English
• Subjects: Calorimetry; Diethylene triamine; Differential scanning calorimetry; Diisocyanates; Dodecanol; Dodecanol dodecanoate; Emission analysis; Energy storage; Evaporation; Field emission microscopy; Heat resistance; High temperature; Infrared analysis; Latent heat; Microcapsules; Microencapsulation; Particle size distribution; Phase change materials; Phase change microcapsules; Polyurea; Scanning electron microscopy; Size distribution; Solar energy; Solar heating; Solvents; Spectrometry; Thermal conductivity; Thermal energy; Thermal property; Thermogravimetric analysis; Toluene
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2020.02.071

•Solvent free technology is applied in the polymerization of MEPCM.•The MEPCM possess high latent heat, good thermal stability and high thermal conductivity.•The mechanism of the interfacial polymerization is revealed by in situ component analysis. A kind of eco-friendly micro-encapsulated phase change materials (MEPCM) with dodecanol dodecanoate as core material were synthesized via the interfacial polymerization of toluene-2, 4-diisocyanate (TDI) and diethylenetriamine (DETA). During the preparation, a facile solvent free synthesis route was developed owing to the good compatibility of TDI and dodecanol dodecanoate. The synthesized MEPCM were characterized by Field Emission Scanning Electron Microscopy (FE-SEM), Particle Size Distribution (PSD) analyzer, Differential Scanning Calorimetry (DSC), Thermogravimetric/Infrared spectrometry (TG-IR) and thermal constants analyzer. It is found that the resultant MEPCM in nearly spherical shape are in the size scope from 10.0 to 40.0 μm, have the average latent heat in the range of 103.4–140.3 J/g, and exhibit high temperature resistance with an onset evaporation temperature at 234.0 °C. Moreover, the MEPCM possess good thermal conductivity from 0.17 W/m K to 0.21 W/m K. Therefore, it is confirmed that the prepared MEPCM can be regarded as a promising thermal energy storage material appropriate to the thermo-regulating fields such as renewable solar heating system.