Ordering and microdomain orientation in block copolymer films by thermal deprotection

Eunhye Kim, Hyungju Ahn, Hoyeon Lee, Byeongdu Lee, Du Yeol Ryu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Ordering and microdomain orientation for the films of symmetric polystyrene-b-poly(tert-butyl methacrylate)s (PS-b-PtBMAs) was investigated by in-situ grazing incidence small-angle X-ray scattering (GISAXS) and the electron microscopy. During thermal deprotection at higher temperature (200 °C), functional tert-butyl ester units in the PtBMA block component are integrated into inter- or intra-molecular anhydride linkages. It was observed that this process causes an increase in the Flory-Huggins interaction parameter (χ) between the two block components for disordered PS-b-PtBMA film, leading to a modulated nonequilibrium structure. Interestingly, for lamella-forming PS-b-PtBMA film, a significant chain stretching in lateral direction during thermal deprotection resulted in a characteristic strain-induced perpendicular orientation in the middle of the film confined between two parallel orientations of lamellar microdomains.

Original languageEnglish
Pages (from-to)2677-2684
Number of pages8
Issue number12
Publication statusPublished - 2011 May 26

Bibliographical note

Funding Information:
This work was supported by NRF grants ( 2009-0067295 ), Converging Research Center Program ( 2010K001430 ), and APCPI ERC program ( R11-2007-050-00000 ), which are funded by the Ministry of Education, Science & Technology (MEST) , Korea.

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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