Volume 65, Number 5, March 2004
|Page(s)||671 - 677|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 February 2004|
Finite-size effects on surface segregation in polymer blend films above and below the critical point of phase separation
Material Science and Engineering Laboratory, National Institute of Standards and Technology (NIST) - Gaithersburg, MD 20899-8542, USA
2 Philips Research - 5656 AA Eindhoven, The Netherlands
3 Department of Polymer Chemistry, Graduate School of Engineering Kyoto University - Kyoto 606-8501, Japan
Accepted: 5 January 2004
We investigate the influence of temperature and confinement on surface segregation in thin films of deuterated polybutadiene and polyisoprene near the critical point for phase separation. Neutron reflectivity measurements show that polyisoprene enriches at the air and silicon interfaces in both the 1- and 2-phase regions. A transition between in-plane and surface-directed (layered) phase separation is observed with increasing film thickness. Weak critical adsorption effects cause the blend composition profile to be rounded in comparison with profiles normally measured in small liquid mixtures.
PACS: 61.12.Ha – Neutron reflectometry / 68.08.Bc – Wetting / 05.70.Fh – Phase transitions: general studies
© EDP Sciences, 2004
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