Single chain polymer nanoparticles (SCNP) are an attractive polymer architecture that provides functions seen in folded biomacromolecules. The generation of SCNPs, however, is limited by the requirement of a high dilu...
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Single chain polymer nanoparticles (SCNP) are an attractive polymer architecture that provides functions seen in folded biomacromolecules. The generation of SCNPs, however, is limited by the requirement of a high dilution chemical step, necessitating the use of large reactors to produce processable quantities of material. Herein, the chemical folding of macromolecules into SCNPs is achieved in both batch and flow photochemical processes by the previously described photodimerization of anthracene units in polymethylmethacrylate (100 kDa) under UV irradiation at 366 nm. When employing flow chemistry, the irradiation time is readily controlled by tuning the flow rates, allowing for the precise control over the intramolecular collapse process. The flow system provides a route at least four times more efficient for SCNP formation, reaching higher intramolecular cross-linking ratios five times faster than batch operation.
Central to most applications involving graphenes flakes is its mechanical response under various stress/ strain states. In this work, we present an experimental study on single, bi- and tri-layer graphene flakes under...
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ISBN:
(纸本)9788888785332
Central to most applications involving graphenes flakes is its mechanical response under various stress/ strain states. In this work, we present an experimental study on single, bi- and tri-layer graphene flakes under uniaxial tensile strain, for low levels of strain. Graphene layers were subjected to tensile loading by employing a polymeric cantilever beam assembly, where the graphene flakes are embedded into the polymer beam. The mechanical response of graphenes is monitored by simultaneous Raman measurements through the shift of the G and 2D optical phonons, and their strain sensitivities are determined. The results can be used to quantify the amount of uniaxial strain, providing a fundamental tool for graphene based nanocomposites.
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