Preparation and characterization of PVC-based form-stable phase change materials

Several different form-stable phase change materials (FSPCMs), which comprise microencapsulated phase change materials (MEPCMs) as latent heat storage medium and poly(vinyl chloride)/wood flour compound as supporting material, were prepared by blending and compression molding method for the application of potential latent heat thermal energy storage (LHTES). SEM images reveal that prepared FSPCMs have homogeneous constitution and most MEPCM particles in them are undamaged. Both the shell of MEPCM and the matrix prevent the molten paraffin from leakage. DSC results show that melting and freezing temperatures as well as latent heats of the prepared FSPCMs are suitable for potential LHTES applications. Results of thermal performance tests show that the surface temperature fluctuation of the FSPCMs is obviously less than that of plate without MEPCM. Results of mechanical property tests indicate that bending strength, and bending modulus, as well as tensile and impact strength of the FSPCMs with 10 wt% MEPCM are 26.7 MPa, 3.48 GPa, 9.8 MPa and 10 kJ m−2 respectively. The mechanical properties of FSPCMs with poly(vinyl chloride)/wood flour compound as supporting material are superior to those of HDPE-based FSPCMs.