Roles of Polymerization Temperature and Initiator Type on Thermal Properties of Rubitherm® 21 PCM Microcapsules DOI Creative Commons
Refat Al‐Shannaq, Monzer Daoud, Mohammed Farid

et al.

Micro, Journal Year: 2025, Volume and Issue: 5(2), P. 19 - 19

Published: April 12, 2025

Thermal energy storage offers a viable solution for managing intermediate availability challenges. Phase change materials (PCMs) have been extensively studied their capacity to store thermal when available and release it needed, maintaining narrow temperature range. However, effective utilization of PCMs requires its proper encapsulation in most applications. In this study, microcapsules containing Rubitherm®(RT) 21 PCM (Tpeak = °C, ΔH 140 kJ/kg), which is suitable buildings, were synthesized using suspension polymerization technique at different operating temperatures (45–75 °C). Two water-insoluble initiators evaluated: 2,2-Azobis (2,4-dimethyl valeronitrile) (Azo-65) benzoyl peroxide (BPO). The prepared characterized differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), particle size distribution (PSD), electron microscope (SEM), optical microscopy (OM). Additionally, the subjected multiple melting freezing cycles assess reliability performance stability. DSC results revealed that BPO exhibited latent heat comparable those produced with Azo-65 an 75 °C. onset crystallization BPO-encapsulated was approximately 2 °C lower than Azo-65-encapsulated PCMs. greatest melting, 107.76 J/g, by 45 representing content 82 wt. %. On other hand, 55 showed heats 96.02 J/g 95.66 respectively. degree supercooling reduced decreasing temperature, lowest observed All monodisperse PSD ~10 µm, indicating uniformity microcapsule demonstrating variations had no significant impact on distribution. Future research should focus low-temperature extended times.

Language: Английский

Roles of Polymerization Temperature and Initiator Type on Thermal Properties of Rubitherm® 21 PCM Microcapsules DOI Creative Commons
Refat Al‐Shannaq, Monzer Daoud, Mohammed Farid

et al.

Micro, Journal Year: 2025, Volume and Issue: 5(2), P. 19 - 19

Published: April 12, 2025

Thermal energy storage offers a viable solution for managing intermediate availability challenges. Phase change materials (PCMs) have been extensively studied their capacity to store thermal when available and release it needed, maintaining narrow temperature range. However, effective utilization of PCMs requires its proper encapsulation in most applications. In this study, microcapsules containing Rubitherm®(RT) 21 PCM (Tpeak = °C, ΔH 140 kJ/kg), which is suitable buildings, were synthesized using suspension polymerization technique at different operating temperatures (45–75 °C). Two water-insoluble initiators evaluated: 2,2-Azobis (2,4-dimethyl valeronitrile) (Azo-65) benzoyl peroxide (BPO). The prepared characterized differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), particle size distribution (PSD), electron microscope (SEM), optical microscopy (OM). Additionally, the subjected multiple melting freezing cycles assess reliability performance stability. DSC results revealed that BPO exhibited latent heat comparable those produced with Azo-65 an 75 °C. onset crystallization BPO-encapsulated was approximately 2 °C lower than Azo-65-encapsulated PCMs. greatest melting, 107.76 J/g, by 45 representing content 82 wt. %. On other hand, 55 showed heats 96.02 J/g 95.66 respectively. degree supercooling reduced decreasing temperature, lowest observed All monodisperse PSD ~10 µm, indicating uniformity microcapsule demonstrating variations had no significant impact on distribution. Future research should focus low-temperature extended times.

Language: Английский

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