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Thickness and Composition Dependence of the Glass Transition Temperature in Thin Homogeneous Polymer Blend Films

Cited 47 time in Web of Science Cited 49 time in Scopus
Authors
Kim, Jae Hyun; Jang, Jyongsik; Lee, Deuk-Young; Zin, Wang-Cheol
Issue Date
2002
Publisher
American Chemical Society
Citation
Macromolecules 2002, 35, 311-313
Abstract
Nowadays there is much interest in thin polymer
films due to their importance in science and technology.
Studies on Tg in thin polymer films have revealed that
it is dependent on film thickness and that such dependence
increases with decreasing film thickness. As
for the case where the interaction between the polymer
and the substrate is not large enough to affect the glass
transition, Tg usually decreases with decreasing thickness.
On the other hand, Tg of films coated on a
strongly favorable substrate increased with decreasing
film thickness due to a strong interaction between
polymer and substrate. Although many experimental
works have been performed on Tg in typical homopolymer
thin films, there has been no work dealing with
polymer blend systems. The concept of physically blending
two or more existing polymers to obtain new
products has been attracting widespread interest and
commercial utilization.14 This blending method can be
used as a good way to control the basic properties of
polymers without sacrificing many attractive properties
of each polymer. One of the most attractive compatible
blends is that of poly(2,6-dimethyl-1,4-phenylene oxide)
(PPO) and polystyrene (PS). Perhaps the most unambiguous
criterion of polymer compatibility is the detection
of a single glass transition temperature whose
temperature is intermediate between those corresponding
to the two-component polymers. For the bulk blend
systems, PPO and PS are known to be compatible in
all compositions.
In this study, to find out the thickness dependence of
Tg depression in the compatible PPO and PS blend thin
films, the Tgs of the films are measured as functions of
thickness (200-1200 Å) and composition and compared
ISSN
0024-9297
Language
English
URI
https://hdl.handle.net/10371/61927
DOI
https://doi.org/10.1021/ma010198n
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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