A Novel Thermally Conductive Phase Change Material of Polythiophene-Coated Core–Shell Polyethylene Glycol/Nano Zinc Oxide by In Situ Polymerization

Abstract

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.

Liquid-Phase Synthesis of Nano-Zinc Oxide and Its Photocatalytic Property

“…Ahmed and Makki used the seed growth method of single-crystal Si-coated with Au atom clusters and sapphire substrate to control the growth orientation, preferred growth region, particle diameter, and particle morphology of ZnO nanoparticles [ 4 ]. Zhang et al used Au atom as a catalyst to selectively prepare ZnO nanowire on tungsten substrate and investigated its field emission properties [ 5 ].…”

“…ey can capture electrons in organic matter or solvent on the surface of semiconductor particles so that substances that do not absorb light can be activated and oxidized. At the same time, photogenic holes also interact with water to generate hydroxyl radicals with strong oxidation, which can attack most organic compounds without selectivity, as shown in formulas ( 4) and (5).…”

Copper and graphene work together to construct a three‐dimensional skeleton thermal conductivity network to improve the thermal conductivity of the epoxy resin

“…With the development of integrated circuits, electronic devices become more and more miniaturized and highpower, which means that electronic devices work more and more in heat, letting the heat accumulate, 1 then the life and stability of these electronic devices will be affected. [2][3][4][5] Therefore, the development of efficient heat dissipation materials has become an urgent need for the development of integrated circuits. [6][7][8] Polymer composites have attracted much attention because of their good performance, [9][10][11][12][13] including light weight, easy to process and other advantages, but the thermal conductivity of most polymers themselves is not high, only 0.1-0.3 W m À1 K À1 , which cannot meet the heat dissipation requirements of electronic devices.…”

A dual non-covalent bonding constructed continuous interfacial structure for reducing interfacial thermal resistance

“…CP can be an effective interfacial thermal resistance regulator with intrinsic thermal conductivity and the ability to establish multiple non-covalent bonding, but it was rarely reported. 15 Herein, a cationic poly(3-hexylthiophene) (C-P3HT) modier was synthesized to construct a continuous heat transfer interface in composites. The interface thermal conductivity of polyvinyl alcohol (PVA)-based graphitic thermal conductive composites, prepared via layer-by-layer (LBL) self-assembling technology, was enhanced due to the heat ux dual channel of cation-p and p-p interactions between C-P3HT and E-G, which optimized the interfacial structure of E-G layers.…”

“…CP can be an effective interfacial thermal resistance regulator with intrinsic thermal conductivity and the ability to establish multiple non-covalent bonding, but it was rarely reported. 15…”