Accelerated Self-Healing and Property Recovery in Brush Particle Solids Featuring Brush Dispersity

Wu, Hanshu; Shi, Yunping; Lin, Ting-Chih; Abdullah, Ayesha; Bockstaller, Michael R.; Matyjaszewski, Krzysztof

doi:10.1021/acsmacrolett.5c00036

Title: Accelerated Self-Healing and Property Recovery in Brush Particle Solids Featuring Brush Dispersity

Journal Article · 06 March 2025 · ACS Macro Letters

DOI: https://doi.org/10.1021/acsmacrolett.5c00036 · OSTI ID:2528111

Wu, Hanshu ^[1]; Shi, Yunping ^[1]; Lin, Ting-Chih ^[1]; Abdullah, Ayesha ^[1];

^[1];

^[1]

Carnegie Mellon University, Pittsburgh, PA (United States)

Brush particles, hybrid materials consisting of polymer chains tethered to particle surfaces, offer tunable properties that make them promising candidates for advanced functional materials. This study investigated the role of chain dispersity in the viscoelastic self-healing of poly (methyl acrylate) (PMA)-based brush particle solids. Increasing the molecular weight dispersity of grafted chains significantly enhanced both strain-to-fracture and toughness of brush particle solids, while the elastic modulus and glass transition temperature were independent of chain dispersity. Cut-and-adhere testing revealed a significant acceleration of the rate of toughness recovery in high-dispersity systems as compared to low-dispersity analogs for which toughness recovery markedly lagged the recovery of Young’s modulus. The results suggest that structure and property recovery in brush particle solids are sensitive to the dynamical heterogeneity of brush canopies and highlight the role of molecular weight dispersity as a design parameter to enable hybrid materials with advanced self-healing ability.

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Research Organization:: Carnegie Mellon University, Pittsburgh, PA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018784

OSTI ID:: 2528111

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 3 Vol. 14; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Physical and chemical properties
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Young’s modulus

Title: Accelerated Self-Healing and Property Recovery in Brush Particle Solids Featuring Brush Dispersity

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