Poly(ethylene glycol)/Polyvinyl chloride Composite Form‐Stable Phase‐Change Materials by the Azide‐Alkyne Click Reaction

Abstract

Thermal energy storage has become a key area in modern technology. Polyethylene glycol (PEG) is known to be an extremely effective solid-liquid phase change material (PCM). For efficient energy storage, alternative liquid-solid PCMs without encapsulation were designed. In particular, a series of PCMs, comprising PEG-stearate and PEG-stearate-Polyvinyl chloride (PVC), were prepared by the azide-alkyne cycloaddition click reaction. The click reactions of azido-PEG, azido-PVC, and alkynyl stearate were carried out. The prepared polymers, PEG-stearate and PEG-stearate-PVC PCMs were characterized by Fourier-transform infrared spectroscopy (FTIR) spectroscopy. The latent heat and thermal stability of PCMs were investigated by Differential Scanning Calorimetry (DSC) and Thermogravimetric analyzer (TGA). DSC results revealed that PCMs exhibit latent heat values ranging from 80 to 104 J/g at -2 and 46°C. In addition, PCMs exhibited high thermal stability with the increase in the content of PVC.

Revisiting poly(vinyl chloride) reactivity in the context of chemical recycling

“…As an example, an azide can be installed onto the polymer backbone using conventional S N 2 chemistry and then subsequently reacted with an alkyne to yield a triazole linkage in a "click" reaction. This strategy has been used to affix different moieties onto PVC for wide-ranging applications, including covalently linked plasticizers, [72][73][74][75][76][77] electrochemical systems, [78][79][80][81][82][83] metal detection, 84 energy storage, 85 photochemistry, 86,87 and anti-bactericides. 88,89 One potential limitation is the lower degree of azide incorporation (<15%) due to both incomplete substitution and competing elimination pathways.…”

Biodegradable Polyurethane Solid‐Solid Phase Change Materials

“…[11,12] Solid-to-solid PCMs can be divided into three classes: inorganic solid-solid, organic solid-solid and polymer-based solid-solid PCMs. [13] Natural polymers, [14] epoxy, [15] cellulose, [16] polystyrene, [17] acrylic polymers, [18] polyethylene glycol (PEG) [19] and polyurethanes [20] have been utilized to prepare polymer-based solid-solid PCM.…”

Reliable phase‐change polyurethane crosslinked by dynamic ionic‐bond crosslinking for thermal energy storage

“…According to the chemical structure, PEG‐based polymers as PCMs for thermal energy storage are usually divided into two types: thermoplastic PCMs and thermosetting PCMs. Thermoplastic PCMs can be easily fabricated into desirable shape via injection, extrusion, and hot‐pressing molding techniques, which should be ascribed to their linear molecular structure . For example, Chen et al .…”