Architected Spatially Deterministic Multiscale Phase Segregation in Block Copolymer Composites for Augmented Radiative Cooling.

Authors

Mingxin Feng, Feiyang Zhou, Haoran Cai, Wenchao Zhai, Shuangjiang Feng, Yanmei Liu, Xiaohai Bu, Man He, Dudong Feng, Shuang Liang, Yuming Zhou

Published in

Advanced science (Weinheim, Baden-Wurttemberg, Germany). Pages e77913. Sep 27, 2026. Epub Sep 27, 2026.

Abstract

Passive radiative cooling, which reflects solar irradiation while emitting heat through the atmospheric window, provides a sustainable solution for zero-energy thermal management. Simultaneously achieving high solar reflectivity and infrared emissivity remains challenging since the structural parameters governing light scattering and thermal radiation are intrinsically coupled. A block copolymer composite (denoted SEDO) of polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was judiciously designed and architected through multiscale phase segregation to enable decoupled structure-determined spectral regulation. Macroscopic phase segregation in SEDO endows three-dimensionally interconnected porous skeleton that enhances broadband Mie scattering, resulting in a high solar reflectivity of 97.2%. Meanwhile, DOPO fillers that selectively located in the polystyrene domains introduce strong molecular vibrational absorption within the atmospheric window. The cylindrical microphase separation morphology enables an emissivity of 95.5% with only 5 vol% additive. Benefiting from this decoupled optical regulation, the composite achieves sub-ambient cooling of ∼8.1°C under clear-sky conditions and ∼6.3°C under cloudy conditions, while maintaining efficient heat dissipation under high heat flux. Combined with excellent mechanical flexibility, flame retardancy, and environmental stability, this multiscale phase segregation strategy provides a versatile platform for augmented radiative cooling in practical thermal-management applications via crafting spatially deterministic block copolymer composites.

PMID:
42801644
Bibliographic data and abstract were imported from PubMed on 28 Sep 2026.

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