Abstract
The heat storage and phase transition behavior of a series of poly(vinyl alcohol)- g-octadecanol copolymers (PVA- g-C18OH) with apparent grafting ratios ranging from 283 to 503%, synthesized through “ grafting to” method, has been investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide-angle X-ray diffraction (WAXD) and polarized optical microscopy (POM). PVA- g-C18OH copolymers exhibit the better thermal stability against C18OH, and the thermal energy storage ability (Δ H m) is of dependence on the apparent grafting ratios. Compared with C18OH, the lower thermal storage efficiency possible is attributed to the less CH 2 groups entered into the crystalline domains and the frustrated mobility of the grafted C18 alkyl side chains between PVA backbones. The results show that PVA- g-C18OH copolymers have the better thermal stability and storage ability, which can be wildly applied in the aspect of thermal energy storage.
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