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Crystallization kinetics and crystalmorphology in thin poly(ethylene oxide) films |
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| Authors: | M.?V.?Massa,K.?Dalnoki-Veress author-information" > author-information__contact u-icon-before" > mailto:dalnoki@mcmaster.ca" title=" dalnoki@mcmaster.ca" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,J.?A.?Forrest |
| Affiliation: | (1) Department of Physics & Astronomy and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, L8S 4M1, Canada;(2) Department of Physics and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, ON, N2L 3G1, Canada |
| Abstract: | We present a detailed study of the kinetics ofcrystallization for thin films of poly(ethylene oxide) (PEO).Measurements of the growth rate have been carried out usingoptical-microscopy techniques on films of monodisperse PEO.Films with thicknesses from 13 nm to ~2  m were crystallizedisothermally at temperatures ~20°C below the melting point. Aremarkable non-monotonicslowing-down of the crystal growth is observed for films withthickness less than ~400 nm. The changes in the growth rate frombulk-like values is significant and corresponds to a factor of40 decrease for the thinnest films studied. The morphologies ofisothermally crystallized samples are studied using atomic-forcemicroscopy. We find that a morphology, similar todiffusion-controlled growth (dendritic growth and denselybranched growth), is observed for films withh < 150 nm. In addition,changes in the morphology occur for thicknesses consistent withchanges in the growth rate as a function of film thickness. |
| Keywords: | 61.41.+e Polymers, elastomers, and plastics 68.55.-a Thin film structure and morphology 81.10.-h Methods of crystal growth physics of crystalgrowth |
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