Applications of Single‐Chain Polymer Nanoparticles

Rubio‐Cervilla, Jon; González, Edurne; Pomposo, José A.

doi:10.1002/9783527806386.ch9

Cited by 9 publications

(8 citation statements)

References 151 publications

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“…We also note that the c-SCNPs system could not be dissolved and diluted after the experiments, to perform a posteriori SEC analysis. This observation also confirms the formation of a gel-like structure after the condensation of these nanoparticles in a bulk material with reminiscences of copper ions [44,45]. Finally, we also note that the overlap of the G"(w) in the master curve is clearly worse than in the precursor melt.…”

Section: Discussionsupporting

confidence: 81%

Collective Motions and Mechanical Response of a Bulk of Single-Chain Nano-Particles Synthesized by Click-Chemistry

et al. 2020

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We investigate the effect of intra-molecular cross-links on the properties of polymer bulks. To do this, we apply a combination of thermal, rheological, diffraction, and neutron spin echo experiments covering the inter-molecular as well as the intermediate length scales to melts of single-chain nano-particles (SCNPs) obtained through ‘click’ chemistry. The comparison with the results obtained in a bulk of the corresponding linear precursor chains (prior to intra-molecular reaction) and in a bulk of SCNPs obtained through azide photodecomposition process shows that internal cross-links do not influence the average inter-molecular distances in the melt, but have a profound impact at intermediate length scales. This manifests in the structure, through the emergence of heterogeneities at nanometric scale, and also in the dynamics, leading to a more complex relaxation behavior including processes that allow relaxation of the internal domains. The influence of the nature of the internal bonds is reflected in the structural relaxation that is slowed down if bulky cross-linking agents are used. We also found that any residual amount of cross-links is critical for the rheological behavior, which can vary from an almost entanglement-free polymer bulk to a gel. The presence of such inter-molecular cross-links additionally hinders the decay of density fluctuations at intermediate length scales.

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Section: Discussionsupporting

confidence: 81%

Collective Motions and Mechanical Response of a Bulk of Single-Chain Nano-Particles Synthesized by Click-Chemistry

et al. 2020

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“…4 Although less precisely structured than enzymes, the single-chain nanoparticles have demonstrated highly efficient catalytic performances. 5 Chiral characteristics can be integrated within the single-chain nanoparticles. 6 By extending the concept of intramolecular crosslinking from homopolymers to copolymers, Janus singlechain nanoparticles are achieved.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Since Kuhn and Majer in 1956 first proposed intramolecular crosslinking of a single polymer chain toward the corresponding globular colloid, single-chain nanoparticles have attracted widespread interest. , As an example, single-chain nanoparticles are compartmentalized with tunable functional groups and can act as artificial enzymes . Although less precisely structured than enzymes, the single-chain nanoparticles have demonstrated highly efficient catalytic performances . Chiral characteristics can be integrated within the single-chain nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Single-Chain Janus Nanoparticle by Metallic Complexation

et al. 2020

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Single-chain Janus nanoparticle of the example polymer polystyrene-blockpoly(2-vinylpyridine)-block-polyethylene oxide (PS-b-P2VP-b-PEO) was achieved by intramolecular crosslinking via complexation of P2VP with cobalt octacarbonyl, while the metallic complex was incorporated within the crosslinked core. It is crucial to introduce electrostatic interaction along the chain by pretreatment and thus ensure the intramolecular crosslinking in concentrated solutions, for example, 30 mg/mL. After thermolysis in the dispersion, the complex is decomposed achieving cobalt within the P2VP core. A magnetic responsive single-chain Janus composite nanoparticle was derived with the P2VP/Co core conjugated with PS and PEO single chains onto the opposite sides. The Janus composite nanoparticle displays highly catalytic activity and magnetic responsive performance from the metallic cobalt and interfacial activity from the PS and PEO single chains. A highly efficient catalytic reduction of nitroaromatic compounds at emulsion interfaces was demonstrated thereby, which was easily recycled with a magnet.

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“…Single-chain nanoparticles (SCNPs) have recently emerged as versatile soft nano-objects with unique characteristics, that make them suitable in an array of applications, such as nanomedicine, 1,2 bioapplications (bioimaging, drug delivery), 3,4 or catalysis. [5][6][7] SCNPs consist of single polymer chains that are cross-linked through intramolecular bonding, in an attempt to mimic the unique properties of natural biomacromolecules (e.g. polypeptides, DNA, enzymes).…”

Section: Introductionmentioning

confidence: 99%