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Mechanistic study of the phase separation/crystallization process of poly(2-isopropyl-2-oxazoline) in hot water

  • The kinetics of the crystallization of thermoresponsive poly(2-isopropyl-2-oxazoline) in water and the time- dependent evolution of the morphology were examined using wide-angle X-ray scattering and conventional and cryogenic scanning electron microscopy. Results indicate that a temperature-induced phase separation produces a bicontinuous polymer network-like structure, which with the onset of crystallization collapses into individual particles (1-2 mu m in diameter) composed of a porous fiber mesh. Nanofibers then preferentially form at the particle surface, thus wrapping the microspheres like a ball of wool. The particle morphology is severely affected by changes in temperature and less by the initial polymer concentration.

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Author:Christina DiehlGND, Peter Cernoch, Ingrid Zenke, Heike Runge, Rona Pitschke, Juergen Hartmann, Brigitte Tiersch, Helmut SchlaadORCiDGND
Document Type:Article
Year of first Publication:2010
Year of Completion:2010
Release Date:2017/03/25
Source:Soft matter. - ISSN 1744-683X. - 6 (2010), 16, S. 3784 - 3788
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert