Poly(ethylene glycol)/poly(methyl methacrylate) Blends as Novel Form-Stable Phase-Change Materials for Thermal Energy Storage

In this study, we focused on the preparation and characterization of poly(ethylene glycol) (PEG)/poly(methyl methacrylate) (PMMA) blends as novel form-stable phase-change materials (PCMs) for latent-heat thermal energy storage (LHTES) applications. In the blends, PEG acted as a PCM when PMMA was operated as supporting material. We subjected the prepared blends at different mass fractions of PEG (50, 60, 70, 80, and 90% w/w) to leakage tests by heating the blends over the melting temperature of the PCM to determine the maximum encapsulation ratio without leakage. The prepared 70/30 w/w % PEG/PMMA blend as a form-stable PCM was characterized with optical microscopy and Fourier transform infrared spectroscopy. The thermal properties of the form-stable PCM were measured with differential scanning calorimetry (DSC). DSC analysis indicated that the form-stable PEG/PMMA blend melted at 58.07 degrees C and crystallized at 39.28 degrees C and that it had latent heats of 121.24 and 108.36 J/g for melting and crystallization, respectively. These thermal properties give the PCMs potential LHTES purposes, such as for solar space heating and ventilating applications in buildings. Accelerated thermal cycling tests also showed that the form-stable PEG/PMMA blend as PCMs had good thermal reliability and chemical stability. (C) 2009 Wiley Periodicals, Inc. J Appl Polyrn Sci 116: 929-933, 2010