Submicron Polyethylene Particles from Catalytic Emulsion Polymerization

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BAUERS, Florian Martin, Ralf THOMANN, Stefan MECKING, 2003. Submicron Polyethylene Particles from Catalytic Emulsion Polymerization. In: Journal of the American Chemical Society. 125(29), pp. 8838-8840. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja034504j

@article{Bauers2003Submi-9538, title={Submicron Polyethylene Particles from Catalytic Emulsion Polymerization}, year={2003}, doi={10.1021/ja034504j}, number={29}, volume={125}, issn={0002-7863}, journal={Journal of the American Chemical Society}, pages={8838--8840}, author={Bauers, Florian Martin and Thomann, Ralf and Mecking, Stefan} }

2003 Attribution-NonCommercial-NoDerivs 2.0 Generic 2011-03-24T18:12:35Z Thomann, Ralf eng Bauers, Florian Martin First publ. in: Journal of the American Chemical Society ; 125 (2003), 29. - S. 8838-8840 application/pdf Mecking, Stefan Submicron Polyethylene Particles from Catalytic Emulsion Polymerization Bauers, Florian Martin Mecking, Stefan Particles of linear polyethylene (Mn = (2-3)X 10000 g mol-1; Mw/Mn = 2-4) obtained by catalytic emulsion polymerization of ethylene possess a nonspherical, lentil-like shape with an average aspect ratio of ca. 10 and diameters from 30 to > 300 nm, as determined by TEM and AFM. The particle structure results from a stacking of the lamellae along the one shorter axis of the lentils (i.e., their height, by contrast to the diameter). In addition to these multilamellae particles, remarkably, a considerable number of the particles consist of only a single lamella. The thickness of the lamellae (spacing) as determined by TEM is only 9-11 nm, depending on the polymerization temperature during the synthesis of the dispersions. Crystallization in the dispersions during emulsion polymerization differs dramatically from the usual heterogeneous nucleation of bulk polyethylene samples. Each submicron droplet crystallizes individually, independently from the other droplets, resulting in large supercoolings of around 55 °C. Thomann, Ralf

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