A brief of organic phase change materials and practical properties
Organic phase change material as an effective energy storage tool has attracted the great interest of scholars. This article is articulated to simply understand the practical properties of OPCMs. Broadly they possess the ability to absorb and release large quantities of latent heat during a phase change process over a certain temperature range. The use of OPCMs in energy storage and thermal insulation has been tested scientifically and industrially in many applications.
Thermal conductivity of organic phase change materials
The mainstream method for improving thermal conductivity is to compound with high thermal conductivity materials to form an internal heat transfer network, the traditional way is physical blending, there are carbon materials such as expanded graphite (EG), graphene (Graphene), carbon nanotubes (CNTs), nano metal particles such as aluminum powder, copper powder or ceramic fillers such as boron nitride (BN), aluminum nitride (AlN), silicon carbide (SiC). Adsorption of PCM with a high thermal conductivity framework is another effective strategy. Commonly used materials are graphite foam, metal foam, graphene oxide (GO), chemically modified porous carbon skeleton, etc.
The flexibility of organic phase change materials
Adding copolymers to PCM materials by impregnation or physical blending can effectively improve the flexibility of PCM and improve its lack of melt leakage. The traditional copolymer materials that have been studied more often include low-density polyethylene (LDPE), high-density polyethylene (HDPE), epoxy resin (ER), etc., and the formation of a supporting skeleton can improve the plasticity of PCM and the deficiency of easy leakage of melt, but its deformation stability is still relatively insufficient. Therefore, new multi-polymers with better elasticity and flexibility, such as thermoplastic ester elastomers (TPEE), olefin block copolymers (OBC), ethylene-vinyl acetate (EVA), styrene-butene-polystyrene (SEPS), +vx:fggc08 Styrene-butadiene-styrene (SBS), styrene-ethylene-butadiene-styrene (SEBS), ethylene propylene diene (EPDM), etc. have been proposed to further improve flexibility over a wider temperature range.
Reinforced flame retardant property of organic phase change materials
There are usually two ways to evaluate the flame retardant effect: one is the limiting oxygen index (LOI), which refers to the proportion of oxygen required when the material begins to burn in the nitrox-oxygen mixture, and the higher the LOI value, the better the flame retardant effect; The other is the heat release rate (HRR) during combustion, which can directly see the combustion intensity of the battery or material. Mixing glass fiber, ammonium polyphosphate (APP), Al(OH)3, silicon aerogel, and other flame retardants in organic PCM is an effective way to improve flame retardancy, forming a dense protective layer or releasing non-combustible gas to isolate oxygen during combustion to achieve the flame retardant effect.
OPCMs are advanced energy storage materials with the ability to store and release thermal energy at a constant temperature. They have a very distinct property in that they can absorb energy while heating as it undergoes a change in phase and emits the absorbed energy to the environment in a reverse mechanism.
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