For phase change
materials (PCMs) confined in porous structure,
the interface interaction between the PCM and the porous skeleton
is the key factor to determine the thermal storage performance of
PCM. In this study, the modified expanded vermiculite (EVM) was prepared
by dopamine modification and DTA
+
intercalation method
and a series of EVM-based composite phase change materials with form
shape (fs-CPCMs) were prepared by physical impregnation using
n
-octadecane as PCMs. The heat storage performance of the
composite phase change materials were improved obviously, and the
encapsulation ratio is increased to 84.7% and 83.1%. The nonisothermal
crystallization process of prepared composite phase change material
were further studied. The effects of dopamine modification and organic
intercalation on the encapsulation performance of EVM-based fs-CPCMs
were analyzed. The results of XRD, FT-IR, thermal cycle, and TGA tests
showed that EVM-based composite phase change materials had good chemical
compatibility, thermal reliability, and thermal stability. This study
provides a theoretical basis for the preparation of EVM-based fs-CPCMs
with high thermal stability and good heat storage performance.
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