Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00059 : Supercritical carbon dioxide induced surface melting/recrystallization process in ultrathin PEO films
Author:
Crystallization of polymeric materials in nanoconfined geometries has
attracted considerable attention in the past decade. In this talk, we will
show the novel effects of supercritical carbon dioxide as a plasticizer in
order to control the melting/crystallization behavior of semicrystalline
polymer thin films. Poly(ethylene oxide) (PEO) thin films with thickness of
10nm-100nm were used for this study. In-situ neutron reflectivity technique
was utilized to study the swelling behavior of deuterated PEO films in
scCO$_{2}$ at T=50\r{ }C, showing the clear evidence of the surface melting
phenomenon even below the bulk melting temperature (65\r{ }C). The surface
structures before and after exposure at the different CO$_{2}$ process
conditions were then investigated in air by using atomic force microscopy
and grazing incidence x-ray diffraction. The results clearly showed that
scCO$_{2}$-induced re-crystallization from the amorphous state via pressure
quench results in various surface crystalline structures, depending on
temperature, pressure, quench rates, and the film thickness.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.59
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