Abstract:

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.

Key words: poplar, polyethylene glycol, phase change enthalpy, phase change material, thermal stability