Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films: A stable hexagonally modulated layer structure

Sungmin Park; Kyosung Koo; Kyunginn Kim; Hyungju Ahn; Byeongdu Lee; Cheolmin Park; Du Yeol Ryu

doi:10.1016/j.polymer.2015.01.022

Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films: A stable hexagonally modulated layer structure

Sungmin Park, Kyosung Koo, Kyunginn Kim, Hyungju Ahn, Byeongdu Lee, Cheolmin Park, Du Yeol Ryu

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

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_o, where L_ois 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.

Original language	English
Pages (from-to)	32-39
Number of pages	8
Journal	polymer
Volume	60
DOIs	https://doi.org/10.1016/j.polymer.2015.01.022
Publication status	Published - 2015 Mar 9

Bibliographical note

Funding Information:
This research was supported by the Samsung Research Funding Center of Samsung Electronics under Project Number SRFC-MA1301-03 and NRF grants (2014R1A2A2A01004364) funded by the Ministry of Science, ICT & Future Planning (MSIP), Korea .

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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title = "Transition behavior of asymmetric polystyrene-b-poly(2-vinylpyridine) films: A stable hexagonally modulated layer structure",

abstract = "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.",

author = "Sungmin Park and Kyosung Koo and Kyunginn Kim and Hyungju Ahn and Byeongdu Lee and Cheolmin Park and Ryu, {Du Yeol}",

note = "Funding Information: This research was supported by the Samsung Research Funding Center of Samsung Electronics under Project Number SRFC-MA1301-03 and NRF grants (2014R1A2A2A01004364) funded by the Ministry of Science, ICT & Future Planning (MSIP), Korea . ",

year = "2015",

month = mar,

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doi = "10.1016/j.polymer.2015.01.022",

language = "English",

volume = "60",

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AU - Park, Sungmin

AU - Koo, Kyosung

AU - Kim, Kyunginn

AU - Ahn, Hyungju

AU - Lee, Byeongdu

AU - Park, Cheolmin

AU - Ryu, Du Yeol

N1 - Funding Information: This research was supported by the Samsung Research Funding Center of Samsung Electronics under Project Number SRFC-MA1301-03 and NRF grants (2014R1A2A2A01004364) funded by the Ministry of Science, ICT & Future Planning (MSIP), Korea .

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.

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