Full-scale polymer relaxation induced by single-chain confinement enhances mechanical stability of nanocomposites

Jin Huang, Hangsheng Zhou, Longhao Zhang, Li Zhang, Wei Shi, Yingchao Yang, Jiajia Zhou, Tianyi Zhao and Mingjie Liu ()
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Jin Huang: Beihang University
Hangsheng Zhou: Beihang University
Longhao Zhang: Beihang University
Li Zhang: Beihang University
Wei Shi: Beihang University
Yingchao Yang: Beihang University
Jiajia Zhou: South China University of Technology
Tianyi Zhao: Beihang University
Mingjie Liu: Beihang University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Polymer nanocomposites with tuning functions are exciting candidates for various applications, and most current research has focused on static mechanical reinforcement. Actually, under service conditions of complex dynamic interference, stable dynamic mechanical properties with high energy dissipation become more critical. However, nanocomposites often exhibit a trade-off between static and dynamic mechanics, because of their contradictory underlying physics between chain crosslinking and chain relaxation. Here, we report a general strategy for constructing ultra-stable dynamic mechanical complex fluid nanocomposites with high energy dissipation by infusing complex fluids into the nanoconfined space. The key is to tailor full-scale polymer dynamics across an exceptionally broad timescale by single-chain confinement. These materials exhibit stable storage modulus (100 ~ 102 MPa) with high energy dissipation (loss factor > 0.4) over a broad frequency range (10−1 ~ 107 Hz)/temperature range (−35 ~ 85°C). In the loss factor > 0.4 region, their dynamic mechanical stability (rate of modulus change versus temperature (k)) is 10 times higher than that of conventional polymer nanocomposites.

Date: 2024
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DOI: 10.1038/s41467-024-51187-y

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