Volume 68, Number 2, October 2004
|Page(s)||219 - 225|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 October 2004|
Mobile nanoparticles and their effect on phase separation dynamics in thin-film polymer blends
Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania Philadelphia, PA 19104-6272, USA
Corresponding author: firstname.lastname@example.org
Accepted: 30 August 2004
We present a systematic study of mobile nanoparticles (NP) and their effect on phase separation dynamics in polymer blend films. Starting with a homogeneous dispersion of silica NP in films, the NP are observed to partition into the PMMA-rich phase and stratify during phase separation. The correlation length ξ between phases grows as for blends containing 0, 2, and 5% NP. However, phase size decreases as the wt% of NP increases. This behavior agrees with a coalescence model, which incorporates an increase in viscosity due to the NP.
PACS: 64.70.Ja – Liquid-liquid transitions / 82.35.Np – Nanoparticles in polymers / 68.55.-a – Thin film structure and morphology
© EDP Sciences, 2004
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