Biodegradable Polyurethane Solid‐Solid Phase Change Materials

Abstract

Polyurethane based phase change material (PCM) was prepared using polyethylene glycol (PEG), isophoronediisocyanate and octadecanol via a two-step process. PEG and octadecanol served as phase change components. The structural characterization of PCM was performed by ATR-FTIR and 1 H-NMR spectroscopies. The latent heat, phase change temperature and thermal stability of PCM were characterized by differential scanning calorimetry and thermogravimetric analysis. The results show that PCM has an excellent energy storage capacity, suitable phase transition temperatures and great thermal stability at 100°C without leakage. PEG/octadecanol polyurethane PCM reached 126 and 95 J/g enthalpy values. To investigate the efficiency of the PCM in a biodegradable polymeric support, blend films were prepared by mixing PEG/ octadecanol polyurethane with the PLA. Films exhibited high light transmission. Elongation at break increased compared with pure PLA from 6 % to 87 %. In addition, tensile strength and modules of PLA/PEG-octadecanol PCM decreased. Water contact angle values of the films increased to 66 and 70°with adding polyurethane PCM. In conclusion, PLA/PCMs exhibited high thermal energy storage property and suitable phase change temperature as good as the PEG/octadecanol polyurethane PCM. Therefore, PLA/PCMs can be used in ranges between 10 and 55°C.

Flexible phase change materials for overheating protection of electronics

“…S2). [55,[60][61][62][63][64][65][66][67] In addition, the heat-energy storage ability of 20EG composite PCMs was explored by performing 100 heating-cooling cycles in the range of 5-80 °C (Fig 2c). No appreciable difference in energy storage capacity, phase change temperature, and characteristic peaks position in FTIR spectra after 100 cycles (Fig.…”

“…The common approaches to addressing the rigidity problem of PCMs include blending exible polymer matrix with PCMs [54], con nement PCMs into exible porous scaffolds [49], and developing solid-solid polyurethane-based PCMs by chemical crosslinking copolymerization [55]. Among these methods, blending exible polymer matrix with PCMs method is low cost and eco-friendly, and is easy to adopt by the industrial community.…”

Phase change and thermal energy storage properties of polyurethane phase change materials with mixed soft segment and crosslinking structure

“…The cyclohexyl proton of IPDI was between δ 0.90 and 1.60 ppm. The chemical shift at δ 8.07 ppm was observed for (-C = O)NH proton [32]. The peak appearing at δ 4.1 ~ 4.3ppm could be attributed to methylene protons next to oxygen and nitrogen of urethane linkage.…”

A review of phase change materials and heat enhancement methodologies

“…Oktay and Kayaman‐Apohan (2021) prepared polyethylene glycol (PEG)/octadecanoyl polyurethane which served as PCM, and it can improve the heat storage capacity of many polymeric materials. Therefore, the prepared bio‐based PCMs have considerable potential applications such as temperature control, smart textile, and smart heat storage systems.…”