Authors
Zhenxu Nie, Jinjing Liu, Ning Tan, Cong Wang, Fenglan Tian, Hongmei Ding, Jianjun Li, Chenchen Tian, Zhiwei Liu, Jingchao Li, Yonglai Lu
Published in
Science bulletin. Aug 16, 2026. Epub Aug 16, 2026.
Abstract
Passive cool roofs can substantially reduce building cooling energy consumption, yet commercial roofing materials remain constrained by limited initial solar reflectance (Rsolar) and its severe long-term decay. We developed a multiscale-engineered polyolefin bilayer composite that integrates a titanium dioxide (TiO2)-loaded thermoplastic polyolefin (TPO) substrate with a thin antifouling propylene-based elastomer (PBE)/boron nitride (BN) surface layer. Through precise multiscale structural regulation, the composite achieves high mid-infrared emissivity (εmir = 90.7%) and broadband Rsolar, delivering a high initial Rsolar of 94.1%. In parallel, the microphase-separation-free surface layer effectively suppresses dust adhesion, imparting strong antifouling capability. As a result, the composite shows exceptional optical durability under coupled aging-contamination conditions: after 5600 h of xenon-arc accelerated weathering, corresponding to a ten-year-equivalent exposure under the adopted GB/T 18244-based protocol, its Rsolar remains as high as 83% after re-contamination, corresponding to 88% retention of the initial value. This aged-and-fouled Rsolar outperforms representative three-year benchmarks of commercial products listed by the Cool Roof Rating Council (CRRC), including the highest-rated single-ply membranes that typically decay from Rsolar = 91% to 73% after three years, positioning this polyolefin composite as an industrially scalable and durable cool-roof membrane platform.
PMID:
42686506
Bibliographic data and abstract were imported from PubMed on 03 Sep 2026.
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