Reversible Change in Performances of Polymer Networks via Invertible Architecture-Transformation of Cross-Links

A polymer nanoparticle network using single-chain nanoparticles (SCNPs) as cross-links is designed. The experimental and theoretical study shows that incorporating SCNPs in polymer networks leads to smaller mesh size, faster terminal relaxation time, and reduced fluctuation among cross-links, resulting in a significant increase in shear storage modulus, and enhancement in tensile stress. Notably, the reversible single-chain collapse of SCNPs under thermal stimulation enables the polymer network to undergo coherent changes between two topological states, thereby exhibiting reversible transformations between soft and stiff states. This approach and finding can effectively tailor the mechanical properties of polymer networks, potentially leading to the development of intelligent, responsive materials.

Automated summary

A polymer nanoparticle network was designed using single-chain nanoparticles as cross-links. Experimental and theoretical studies demonstrated that this network exhibited smaller mesh size, faster terminal relaxation time, and reduced fluctuation among cross-links, resulting in increased shear storage modulus and enhanced tensile stress. Importantly, the reversible single-chain collapse of the nanoparticles under thermal stimulation enabled the network to undergo coherent changes between two topological states, demonstrating reversible transformations between soft and stiff states.