Abstract
In this paper, glass transitions of polystyrene (PS) in confined geometry such as ultrathin state, surface and interface were studied. Dynamic mechanical analysis was successfully used to characterize polymer ultrathin films supported on substrates. This method allowed us to uncover the effects of the free surface and the substrate interface on the segmental dynamics in PS films with various thickness. As the film thickness decreased, the distribution of relaxation times for the segmental motion became broader, a change mainly due to surface and interfacial effects. The results obtained in this study imply that two contrasting effects exist: the effect of the free surface accelerates the segmental motion, whereas interfacial interaction produce the opposite effect. This was also confirmed by independent experiments related to glass transition temperature at the surface and the interface by scanning force microscopy and time- and space-resolved fluorescence spectroscopy, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 539-547 |
| Number of pages | 9 |
| Journal | KOBUNSHI RONBUNSHU |
| Volume | 63 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 1 2006 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering (miscellaneous)
- Materials Science (miscellaneous)
- Environmental Science(all)
- Polymers and Plastics
Cite this
Glass transition of polymers in confined systems. / Tanaka, Keiji.
In: KOBUNSHI RONBUNSHU, Vol. 63, No. 8, 01.08.2006, p. 539-547.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Glass transition of polymers in confined systems
AU - Tanaka, Keiji
PY - 2006/8/1
Y1 - 2006/8/1
N2 - In this paper, glass transitions of polystyrene (PS) in confined geometry such as ultrathin state, surface and interface were studied. Dynamic mechanical analysis was successfully used to characterize polymer ultrathin films supported on substrates. This method allowed us to uncover the effects of the free surface and the substrate interface on the segmental dynamics in PS films with various thickness. As the film thickness decreased, the distribution of relaxation times for the segmental motion became broader, a change mainly due to surface and interfacial effects. The results obtained in this study imply that two contrasting effects exist: the effect of the free surface accelerates the segmental motion, whereas interfacial interaction produce the opposite effect. This was also confirmed by independent experiments related to glass transition temperature at the surface and the interface by scanning force microscopy and time- and space-resolved fluorescence spectroscopy, respectively.
AB - In this paper, glass transitions of polystyrene (PS) in confined geometry such as ultrathin state, surface and interface were studied. Dynamic mechanical analysis was successfully used to characterize polymer ultrathin films supported on substrates. This method allowed us to uncover the effects of the free surface and the substrate interface on the segmental dynamics in PS films with various thickness. As the film thickness decreased, the distribution of relaxation times for the segmental motion became broader, a change mainly due to surface and interfacial effects. The results obtained in this study imply that two contrasting effects exist: the effect of the free surface accelerates the segmental motion, whereas interfacial interaction produce the opposite effect. This was also confirmed by independent experiments related to glass transition temperature at the surface and the interface by scanning force microscopy and time- and space-resolved fluorescence spectroscopy, respectively.
UR - http://www.scopus.com/inward/record.url?scp=33748907980&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33748907980&partnerID=8YFLogxK
U2 - 10.1295/koron.63.539
DO - 10.1295/koron.63.539
M3 - Article
AN - SCOPUS:33748907980
VL - 63
SP - 539
EP - 547
JO - Kobunshi Ronbunshu
JF - Kobunshi Ronbunshu
SN - 0386-2186
IS - 8
ER -