Preparation and Characterization of Polyethylene Glycol Wood Composite Phase Change Materials
Through capillary adsorption effect of wood with physical adsorption of polyethylene glycol ( PEG )-10000, polyethylene glycol wood composite phase change materials( PCM) was prepared with wood as skeleton, and polyethylene glycol-10000( PEG-10000) as phase transformation unit. Functional groups were analyzed by fourier transform infrared ( FTIR) spectra, microscopic morphology was analyzed by scanning electron microscopy ( SEM ) and degree of crystallinity was analyzed by X-ray diffraction ( XRD) , it is concluded that wood was well combined with PEG and the degree of crystallinity of PCM increased gradually with PEG-10000 content going up. By using differential scanning calorimetry ( DSC) and thermogravimetry ( TG ) analysis, the enthalpy of phase change was first increased and then decreased, the largest phase change enthalpy is 43. 22 J·g-1 and the thermal stability was obviously increased. The study of permeability of PEG ethanol solution to wood shows that PEG adsorption of wood was mainly parabolic three-stage absorption.
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维普
