Preparation and properties of solid-solid phase change materials based on polyethylene glycol and EPDM cross-linked resin containing cyclodextrin cavity

β-cyclodextrin with vinyl group (β-CD-MA) was synthesized from β-cyclodextrin (β-CD) and glycidyl methacrylate and identified by FT-IR and ¹H-NMR spectroscopy analysis. A novel adsorption resin containing cyclodextrin cavity moieties was prepared by suspension polymerization technique with ethylene-propylene-diene (EPDM), styrene (St) and β-CD-MA as comonomers in this study. The adsorption resin was used as a solid skeleton for adsorption of phase change material such as polyethylene glycol (PEG) to prepare solid-solid phase change materials (SSPCMs). Structure and phase change behaviors of SSPCMs were studied by FT-IR and DSC, and the phase change process of the SSPCM was observed by using reflection mode of POM. The experimental results showed that the introduction of cyclodextrin cavity structure increased the adsorption capacity of PEG and improved the phase change latent heat of SSPCMs. Otherwise, during the whole process of phase change, the surface morphology of SSPCMs could be observed and appeared bright or dark change. During the transition, the whole PCMs remained in solid state.