Poly(urea-formaldehyde) microcapsules containing commercial paraffin: in situ polymerization study
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Microcapsules containing Rubitherm® RT-42 paraffin wax (core) and a poly(urea-formaldehyde) shell were prepared by an in situ polymerization. The influence of prepolymerization/polymerization time, the reaction temperature, and the monomers/phase change material (PCM) mass ratio on the encapsulation process and the physical properties of the resulting microcapsules was studied. The morphology, chemical composition, and particle size distribution of the microcapsules were characterized by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR). It was found that the structure of the generated poly(urea-formaldehyde) microcapsules strongly depended on the reaction time. The content of encapsulated Rubitherm® RT-42 increased with increasing reaction temperature until a limit, ranging the optimum reaction temperature from 60 to 70 °C. Finally, it was found that the optimal monomers/PCM mass ratio was 0.8. The poly(urea-formaldehyde) microcapsules obtained containing the RT-42 paraffin can be used as thermal energy storage systems.
KeywordsIn situ polymerization Microcapsules Poly(urea-formaldehyde) Phase change materials
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Conflict of interest
The authors declare that they have no conflict of interest.
- 4.Borreguero AM, Carmona M, Sanchez ML, Valverde JL, Rodriguez JF (2010) Improvement of the thermal behaviour of gypsum blocks by the incorporation of microcapsules containing PCMS obtained by suspension polymerization with an optimal core/coating mass ratio. Appl Therm Eng 30(10):1164–1169CrossRefGoogle Scholar
- 8.Sánchez-Silva L, Rodríguez JF, Romero A, Sánchez P (2012) Preparation of coated thermo-regulating textiles using Rubitherm-RT31 microcapsules. J Appl Polym Sci 124(6):4809–4818Google Scholar
- 25.Yu X, Huang Z, Yu K (2014) Effects of emulsifiers on preparing spherical urea-formaldehyde paraffin capsules modified by β-cyclodextrin for energy storage. J Nanomater 2014:1–7Google Scholar
- 30.S. Cosco Polymer based microparticles for advanced composite materials applications, Università degli Studi di Napoli Federico II, 2007Google Scholar
- 34.A. Pizzi, K.L. Mittal, Handbook of adhesive technology, revised and expanded, CRC press2003Google Scholar
- 36.C.Z. Xin, L.N. Wang, X.G. Huang, Z.S. Fan, Effect of pre-polymerization conditions on the performance of UF/low melting point paraffin microcapsules, Appl Mech Mater, Trans Tech Publ, 2013, pp. 163–167, 321-324Google Scholar