TY - JOUR
T1 - Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films
T2 - A stable hexagonally modulated layer structure
AU - Park, Sungmin
AU - Koo, Kyosung
AU - Kim, Kyunginn
AU - Ahn, Hyungju
AU - Lee, Byeongdu
AU - Park, Cheolmin
AU - Ryu, Du Yeol
PY - 2015/3/9
Y1 - 2015/3/9
N2 - The phase transitions in the films of an asymmetric polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) were investigated by grazing incidence small-angle X-ray scattering (GISAXS) and transmission electron microscopy (TEM). Compared with the sequential transitions in the bulk, hexagonally perforated layer (HPL) - gyroid (GYR) - disorder (DIS) upon heating, the transitions in film geometry were dramatically changed with decreasing thickness due to the growing preferential interactions from substrate, resulting in a thickness-dependent transition diagram including four different morphologies of hexagonally modulated layer (HML), coexisting (HML and GYR), GYR, and DIS. Particularly in the films ≤ 10Lo, where Lois d-spacing at 150°C, a stable HML structure was identified even above the order-to-disorder transition (ODT) temperature of the bulk, which was attributed to the suppressed compositional fluctuations by the enhanced substrate interactions.
AB - The phase transitions in the films of an asymmetric polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) were investigated by grazing incidence small-angle X-ray scattering (GISAXS) and transmission electron microscopy (TEM). Compared with the sequential transitions in the bulk, hexagonally perforated layer (HPL) - gyroid (GYR) - disorder (DIS) upon heating, the transitions in film geometry were dramatically changed with decreasing thickness due to the growing preferential interactions from substrate, resulting in a thickness-dependent transition diagram including four different morphologies of hexagonally modulated layer (HML), coexisting (HML and GYR), GYR, and DIS. Particularly in the films ≤ 10Lo, where Lois d-spacing at 150°C, a stable HML structure was identified even above the order-to-disorder transition (ODT) temperature of the bulk, which was attributed to the suppressed compositional fluctuations by the enhanced substrate interactions.
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U2 - 10.1016/j.polymer.2015.01.022
DO - 10.1016/j.polymer.2015.01.022
M3 - Article
AN - SCOPUS:84922373392
VL - 60
SP - 32
EP - 39
JO - Polymer
JF - Polymer
SN - 0032-3861
ER -