Shape-Stabilized Phase Change Materials with Superior Thermal Conductivity for Thermal Energy Harvesting

Abstract

This work presents the preparation of highly thermally conductive and shape-stabilized phase change composites (SSPCMs) at low filler loading. Polyethylene glycol (PEG) served as the phase change component. The high thermal conductivity is realized by the construction of dual thermally conductive networks based on boron nitride (BN) and expanded graphite (EG). The shape stabilization is obtained by the combined effects of the physical absorption of EG and the chemical crosslinking of epoxy. The prepared composite has a thermal conductivity of 3.907 W m −1 K −1 at a low filler loading when filled with 6.00% EG and 16.00% BN. Correspondingly, the melting enthalpy and crystallization enthalpy can maintain 79.93 and 75.39 J g −1 , respectively. The result indicates that the prepared composite has excellent thermal stability and PEG is firmly stabilized in the composites, it would not leak from the matrix when exposed to high temperature and long heating periods. The experiment also confirms that the prepared composite has superior solar-thermal energy conversion and thermal management ability.

Enhanced thermal properties of HDPE/EG nanocomposites via synergy of multi‐source pulsating flow and phase transition

“…When EG loading is 9 wt.%, the X c of HEI samples reaches the highest value ($ 64.6%), indicating that dispersive GNPs act as heterogeneous nucleation agents to promote the crystallization of HDPE. 43 The increment of crystallinity increases the mean free path of phonons and decreases the phonon scattering, 44,45 which further confirms the higher thermal conductivity of HEI samples obtained by MSPFPT method. 3.…”

Polyethylene Glycol/Polyurethane Acrylate-Based Flexible Phase-Change Film with Excellent Mechanical Strength and Reversible Optical Performance

“…Examples of organic PCMs are aromatic hydrocarbons, paraffin, alcohols, and fatty acids. − However, the leakage of pure organic PCMs limits their applications. Therefore, several leak-proof methods like microcapsule encapsulation, , porous matrix adsorption, , and polymer matrices , have been adapted to solve this issue.…”

Phase-controllable topochemical polymerization of liquid crystalline epoxy according to spacer length

“…9,10 Over the decades, various studies have focused on overcoming the limitations of thermally conductive matter. [11][12][13][14][15] The methods to improve the thermal conductivities of polymer materials may be divided into two main categories. [16][17][18] The first is the development of a polymer composite material using fillers, such as ceramics, metals, and carbon fibers.…”