Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 9, Pages 4894-4900Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013361
Keywords
supra-nanoparticle clusters; unexpected elasticity; unique dynamic behaviors; well-defined hierarchical structures
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Funding
- National Natural Science Foundation of China [51873067, 21903013] Funding Source: Medline
- Natural Science Foundation of Guangdong Province [2018A030-313503] Funding Source: Medline
- National Key Research and Development Program of China [2018YFB0704200] Funding Source: Medline
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The study investigates the unexpected high elasticity behavior of supra-nanoparticle clusters (SNPCs) with precise structures. It is observed that the SNPC assemblies maintain a high modulus at temperatures far beyond the glass transition temperature, owing to the interpenetration of POSS-ended arms. The physical molecular interpenetration and inter-locking phenomenon in SNPCs favors convenient solution or pressing processing of novel cluster-based elastomers.
Granular materials, composed of densely packed particles, are known to possess unique mechanical properties that are highly dependent on the surface structure of the particles. A microscopic understanding of the structure-property relationship in these systems remains unclear. Here, supra-nanoparticle clusters (SNPCs) with precise structures are developed as model systems to elucidate the unexpected elastic behaviors. SNPCs are prepared by coordination-driven assembly of polyhedral oligomeric silsesquioxane (POSS) with metal-organic polyhedron (MOP). Due to the disparity in sizes, the POSS-MOP assemblies, like their classic nanoparticles counterparts, ordering is suppressed, and the POSS-MOP mixtures will vitrify or jam as a function of decreasing temperature. An unexpected elasticity is observed for the SNPC assemblies with a high modulus that is maintained at temperatures far beyond the glass transition temperature. From studies on the dynamics of the hierarchical structures of SNPCs and molecular dynamic simulation, the elasticity has its origins in the interpenetration of POSS-ended arms. The physical molecular interpenetration and inter-locking phenomenon favors the convenient solution or pressing processing of the novel cluster-based elastomers.
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