TY - JOUR
T1 - Chemical Composition and Strain at Interfaces between Different Morphologies in Block Copolymer Thin Films
AU - Ho, Kevin
AU - Kim, Kris S.
AU - De Beer, Sissi
AU - Walker, Gilbert C.
N1 - Funding Information:
Funding for this work was supported by the Natural Science and Engineering Research Council of Canada (NSERC) and Canadian Foundation for Innovation (CFI). SdB thanks the University of Twente Stimuleringsfonds for financially supporting her collaboration with the Walker Lab. The authors thank Jessica Ye for editorial comments.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/11/2
Y1 - 2021/11/2
N2 - Transitional composition between two thin-film morphologies of the block copolymer, polystyrene-block-poly(tert-butyl acrylate) (PS-b-PtBuA), was investigated using near-field infrared spectroscopy and atomic force microscopy mechanical measurements. These techniques allowed block identification with nanoscale spatial resolution and elucidated the material's sub-surface composition. PS was found to form coronae around the PtBuA block in spherical valleys on flat areas of the film, and coronae of PtBuA surrounding the PS lamellae were observed at the edge of the polymer film, where parallel lamellae are formed. Furthermore, we found that the peak position and width varied by location, which may be a result of block composition, chain tension, or substrate interaction.
AB - Transitional composition between two thin-film morphologies of the block copolymer, polystyrene-block-poly(tert-butyl acrylate) (PS-b-PtBuA), was investigated using near-field infrared spectroscopy and atomic force microscopy mechanical measurements. These techniques allowed block identification with nanoscale spatial resolution and elucidated the material's sub-surface composition. PS was found to form coronae around the PtBuA block in spherical valleys on flat areas of the film, and coronae of PtBuA surrounding the PS lamellae were observed at the edge of the polymer film, where parallel lamellae are formed. Furthermore, we found that the peak position and width varied by location, which may be a result of block composition, chain tension, or substrate interaction.
UR - http://www.scopus.com/inward/record.url?scp=85118788894&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.1c02169
DO - 10.1021/acs.langmuir.1c02169
M3 - Article
C2 - 34693716
AN - SCOPUS:85118788894
SN - 0743-7463
VL - 37
SP - 12723
EP - 12731
JO - Langmuir
JF - Langmuir
IS - 43
ER -