TY - JOUR
T1 - Liquid dewetting of ultrathin polystyrene films
T2 - Is there a molecular architecture effect?
AU - Tata, James R.
AU - Torres Arellano, Astrid K.
AU - McKenna, Gregory B.
N1 - Publisher Copyright:
© 2020 Wiley Periodicals LLC.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - We have used a liquid dewetting method to investigate the glass transition temperature Tg of high molecular weight linear, long branched 3-arm star, and short branched 8-arm star polystyrene (PS) in the form of ultrathin films. The results of these dewetting experiments are consistent with prior studies of dewetting of linear PS films and show that, independent of molecular architecture, the glass transition temperature Tg reductions with decreasing film thickness, while important below about 20 nm, are weaker than those observed for linear PS supported on a rigid substrate and as well as those observed in freely standing films. The lack of a strong molecular architecture effect on the Tg-reductions is consistent with the Tg reductions for the dewetting from a liquid substrate reflects changes in segmental dynamics upon confinement rather than chain effects. This contrasts with changes, including increases seen in dewetting from a rigid substrate, for different molecular architectures reported in the literature.
AB - We have used a liquid dewetting method to investigate the glass transition temperature Tg of high molecular weight linear, long branched 3-arm star, and short branched 8-arm star polystyrene (PS) in the form of ultrathin films. The results of these dewetting experiments are consistent with prior studies of dewetting of linear PS films and show that, independent of molecular architecture, the glass transition temperature Tg reductions with decreasing film thickness, while important below about 20 nm, are weaker than those observed for linear PS supported on a rigid substrate and as well as those observed in freely standing films. The lack of a strong molecular architecture effect on the Tg-reductions is consistent with the Tg reductions for the dewetting from a liquid substrate reflects changes in segmental dynamics upon confinement rather than chain effects. This contrasts with changes, including increases seen in dewetting from a rigid substrate, for different molecular architectures reported in the literature.
KW - glass transition temperature
KW - linear polystyrene
KW - liquid dewetting
KW - star polystyrene
KW - ultrathin films
UR - http://www.scopus.com/inward/record.url?scp=85099501643&partnerID=8YFLogxK
U2 - 10.1002/pol.20200785
DO - 10.1002/pol.20200785
M3 - Article
AN - SCOPUS:85099501643
SN - 2642-4150
VL - 59
SP - 261
EP - 267
JO - Journal of Polymer Science
JF - Journal of Polymer Science
IS - 3
ER -