Two
kinds of thiophene monomers (thiophene and thiophene carboxylic
acid) are used to synthesize a series of polythiophene matrix materials
with different ratios. Polythiophene carboxylic acid can form strong
hydrogen bonds between molecules, and the conjugated thiophene ring
can be used to obtain higher thermal conductivity. The core–shell
structure of polythiophene-coated polyethylene glycol and nano zinc
oxide was synthesized by in situ polymerization to form a shaped phase
change composite. The electron micrograph shows this phenomenon very
well. Comparing the thermal conductivity and heat storage performance
of two different polythiophene matrix composites, it can be explained
that the chemical interaction between molecules is conducive to the
formation of heat conduction pathways. Thermal decomposition temperature
of polythiophene carboxylic acid and its polyethylene glycol composite
structure is about 10 °C higher than that of polythiophene, which,
on the other hand, also indicates the tight molecular arrangement.
It is derived from the differentiation of its molecular structure,
and this compact structure plays a positive role in the improvement
of its thermal conductivity. However, excessive intermolecular force
hinders the regular arrangement of polyethylene glycol. Under the
condition that the amount of thermal conductive filler is 25%, the
thermal conductivity is increased from 0.895 to 1.05 W · m
–1
k
–1 and the phase transition is decreased from 149 J/g to less than
135 J/g. Finally, the stability of the shaped phase change composite
was good, the solid form was maintained near the phase transition
temperature, and no leakage was observed.
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