TY - JOUR
T1 - Substrate effect on mechanical relaxation of polystyrene in ultrathin films
AU - Akabori, K. I.
AU - Tanaka, K.
AU - Takahara, A.
AU - Kajiyama, T.
AU - Nagamura, T.
N1 - Funding Information:
This research was partly supported by the Grant-in-Aids for Scientific Research in Priority Area “Molecular Nano Dynamics”, for Scientific Research A (No. 142051222) and for the 21st century COE program “Functional Innovation of Molecular Informatics” from Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2007/2
Y1 - 2007/2
N2 - Mechanical relaxation behavior in ultrathin polystyrene(PS) films supported on silicon oxide (SiOx) and gold (Au) substrates has been studied by dynamic viscoelastic measurement. Based on the method, effects of free surface and substrate interface on the segmental dynamics were discussed. In the case of thin PS films with a thickness of approximately 200 nm, αa-relaxation process corresponding to the segmental motion did not show any deviation from the bulk behavior. Incontrast, for the films thinner than about 50 nm, the relaxation time distribution for the αa-process became broader, probably due toa mobility gradient in the surface and interfacial regions. When we sandwiched an ultrathin PS film between SiOx layers, another relaxation process, in addition to the original αa-process, appeared at ahigher temperature side that we assigned to the interfacial αa-relaxation process. However, this was never seen for an ultrathin PS film between Au layers, implying that restriction from the substrate interface might be weak in this case.
AB - Mechanical relaxation behavior in ultrathin polystyrene(PS) films supported on silicon oxide (SiOx) and gold (Au) substrates has been studied by dynamic viscoelastic measurement. Based on the method, effects of free surface and substrate interface on the segmental dynamics were discussed. In the case of thin PS films with a thickness of approximately 200 nm, αa-relaxation process corresponding to the segmental motion did not show any deviation from the bulk behavior. Incontrast, for the films thinner than about 50 nm, the relaxation time distribution for the αa-process became broader, probably due toa mobility gradient in the surface and interfacial regions. When we sandwiched an ultrathin PS film between SiOx layers, another relaxation process, in addition to the original αa-process, appeared at ahigher temperature side that we assigned to the interfacial αa-relaxation process. However, this was never seen for an ultrathin PS film between Au layers, implying that restriction from the substrate interface might be weak in this case.
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U2 - 10.1140/epjst/e2007-00036-8
DO - 10.1140/epjst/e2007-00036-8
M3 - Article
AN - SCOPUS:34247376602
SN - 1951-6355
VL - 141
SP - 173
EP - 180
JO - European Physical Journal: Special Topics
JF - European Physical Journal: Special Topics
IS - 1
ER -