Relaxation-enhanced polymer nanocomposites induced by bound polymer loops on the particle surfaces

Quanyin Xu, Hongbo Qu, Zhenghao Wu, Zhen Zhao, Sisi Ge, Jintian Luo () and Biao Zuo ()
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Quanyin Xu: Zhejiang Sci-Tech University
Hongbo Qu: Zhejiang Sci-Tech University
Zhenghao Wu: Xi’an Jiaotong-Liverpool University
Zhen Zhao: Zhejiang Sci-Tech University
Sisi Ge: Zhejiang Sci-Tech University
Jintian Luo: Zhejiang Sci-Tech University
Biao Zuo: Zhejiang Sci-Tech University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Polymer nanocomposites (PNCs) benefit from the enhanced properties originating from the synergistic effects of nanoparticles (NPs) and a polymer matrix. However, the incorporation of NPs slows PNC relaxation, and particularly at high-particle-loading, the PNC melts become non-flowing because the interfacially adsorbed polymers bridge the particles, generating a kinetically quasi-permanent particle network. Herein, by introduction of bound polymer loops on the NP surfaces, we molecularly design a relaxation-enhanced PNC, where interfacial polymers adhering to the NP surfaces freely relaxed, enabling formation of a dynamic, loose particle network that facilitates flow of the PNC melts. The resultant molten high-NP-loading composites maintain fluid-like and low-viscosity dynamics, while the corresponding glassy materials possess enhanced toughness and strength. Thus, the demonstrated principle of preparing relaxation-enhanced PNCs by optimizing the way by which polymers are attached to the filler surface represents the state-of-the-art strategy for overcoming the tradeoff between the processability and mechanical performance of PNCs.

Date: 2025
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DOI: 10.1038/s41467-025-64841-w

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