期刊
POLYMER
卷 60, 期 -, 页码 32-39出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2015.01.022
关键词
Block copolymer; Thin film; Phase transition
资金
- Samsung Research Funding Center of Samsung Electronics [SRFC-MA1301-03]
- NRF - Ministry of Science, ICT & Future Planning (MSIP), Korea [2014R1A2A2A01004364]
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 <= 10L(0), where L-0 is d-spacing at 150 degrees 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. (C) 2015 Elsevier Ltd. All rights reserved.
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