2019
DOI: 10.1038/s41467-019-10692-1
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Uniform shape monodisperse single chain nanocrystals by living aqueous catalytic polymerization

Abstract: The preparation of polymer nanoparticles with a uniform size and shape, beyond spheres, is an unresolved problem. Here we report a living aqueous catalytic polymerization, resulting in particles grown by a single active site and composed of a single ultra high molecular weight polyethylene (UHMWPE) chain. The control on a molecular level ( M w / M n = 1.1–1.2) and at the same time on a particle level (PDI < 0.05) together with the immediat… Show more

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Cited by 70 publications
(90 citation statements)
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“…Considering the particle formation process, the generation of very small (<100 nm) particles requires a high degree of dispersion of the catalyst precursor, and under ideal conditions an entire particle is grown by a single active site . With the catalysts studied here, stable dispersions with a single well‐defined particle population were obtained as observed by DLS (Figure ).…”
Section: Resultsmentioning
confidence: 83%
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“…Considering the particle formation process, the generation of very small (<100 nm) particles requires a high degree of dispersion of the catalyst precursor, and under ideal conditions an entire particle is grown by a single active site . With the catalysts studied here, stable dispersions with a single well‐defined particle population were obtained as observed by DLS (Figure ).…”
Section: Resultsmentioning
confidence: 83%
“…Perfluoroalkyl‐substituted (e.g. n ‐C 6 F 13 ) N ‐terphenyl salicylaldiminato Ni II catalysts (Figure ) were recently demonstrated to be uniquely capable of a truly living polymerization of ethylene under aqueous conditions . In this process narrow distributed ultra‐high‐molecular‐weight strictly linear polyethylene (UHMWPE) is generated, in the unusual form of monodisperse uniformly shaped nanocrystals.…”
Section: Resultsmentioning
confidence: 99%
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“…As outlined above, the synthesis of SCNPs is generally carried out in two steps: Synthesis of the precursor polymer, followed by single chain folding. The group of Mecking recently challenged this paradigm by developing a synthetic approach that enabled the direct folding of growing polymer chains (Figure , bottom right and Figure) . Based on a living aqueous catalytic polymerization, a long‐lived water‐stable Ni(II) catalyst initiated the polymerization of ethylene, whereas immediate crystallization of the growing chain in water initiated its folding.…”
Section: Synthesis: Tackling the Scalabilitymentioning
confidence: 99%
“…As highlighted in the synthesis section, using crystalline order in SCNPs has critical, yet largely untapped potential. In addition to the high concentrations, which are accessible through the strategy of in‐situ polymerization and crystallization driven folding, the highly distinct internal order can translate into defined anisotropic macromolecular architecture (Figure ) . The preferred deposition of the growing polymer chain onto the {110} crystalline growth front gave rise to uniform and monodisperse particles, whose shape evolved from truncated lozenges to lozenges over the course of the SCNP growth.…”
Section: Architecture Beyond Intramolecular Crosslinksmentioning
confidence: 99%