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

IF 5.2 Q1 POLYMER SCIENCE ACS Macro Letters Pub Date : 2025-03-07 DOI:10.1021/acsmacrolett.5c00036

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

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Abstract

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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具有电刷分散性的电刷颗粒固体加速自愈和性能恢复

刷状颗粒是由粘在颗粒表面的聚合物链组成的混合材料，具有可调的性能，使其成为先进功能材料的有希望的候选者。研究了链分散性在聚丙烯酸甲酯（PMA）基刷状颗粒固体粘弹性自愈中的作用。增加接枝链的分子量分散性可显著提高刷状颗粒固体的应变断裂和韧性，而弹性模量和玻璃化转变温度与链的分散性无关。切割黏附测试显示，与低分散性类似物相比，高分散性体系的韧性恢复速度显著加快，而低分散性体系的韧性恢复明显滞后于杨氏模量的恢复。结果表明，刷状颗粒固体的结构和性能恢复对刷状冠层的动态非均质性很敏感，并突出了分子量分散作为设计参数的作用，使混合材料具有先进的自修复能力。

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来源期刊

ACS Macro Letters 化学-

CiteScore

10.40

自引率

3.40%

发文量

209

审稿时长

1 months

期刊介绍： ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.