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Personen: Weber, C. H. M. (Autor) 
Chiche, A. (Autor) 
Krausch, Georg (Autor) 
Rosenfeldt, S. (Autor) 
Ballauff, M. (Autor) 
Harnau, L. (Autor) 
Göttker-Schnetmann, I. (Autor) 
Tong, Q. (Autor) 
Mecking, S. (Autor) 
Titel: Single lamella nanoparticles of polyethylene
Quelle: Nano letters. Bd. 7. H. 7. Washington, DC : ACS Publ. S. 2024 - 2029
Erscheinungsjahr:    2007
ISBN / ISSN: 1530-6992 ; 1530-6984
URL der Originalveröffentlichung doi:10.1021/nl070859f
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Person der Universität:    Krausch, Georg  In UnivIS suchen 
Einrichtung: Universitätsleitung
DDC-Sachgruppe:    Physik
ID: 53588  Universitätsbibliothek Mainz
Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: We present a complete analysis of the structure of polyethylene (PE) nanoparticles synthesized and stabilized in water under very mild conditions (15 °C, 40 atm) by a nickel-catalyzed polymerization in aqueous solution. Combining cryogenic transmission electron microscopy (cryo-TEM) with X-ray scattering, we demonstrate that this new synthetic route leads to a stable dispersion of individual PE nanoparticles with a narrow size distribution. Most of the semicrystalline particles have a hexagonal shape (lateral size 25 nm, thickness 9 nm) and exhibit the habit of a truncated lozenge. The combination of cryo-TEM and small-angle X-ray scattering demonstrates that the particles consist of a single crystalline lamella sandwiched between two thin amorphous polymer layers (“nanohamburgers”). Hence, these nanocrystals that comprise only ca. 14 chains present the smallest single crystals of PE ever reported. The very small thickness of the crystalline lamella (6.3 nm) is related to the extreme undercooling (more than 100 °C) that is due to the low temperature at which the polymerization takes place. This strong undercooling cannot be achieved by any other method so far. Dispersions of polyethylene nanocrystals may have a high potential for a further understanding of polymer crystallization as well as for materials science as, e.g., for the fabrication of extremely thin crystalline layers.
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