Phase Behavior of PS - PVME Nanocomposites

Published

January 1, 2004

Author(s)

K Yurekli, Alamgir Karim, Eric J. Amis, R Krishnamoorti

Abstract

The influence of nanometer thick, highly anisotropic organically modified layered silicate (montmorillonite) on the phase behavior of deuterated polystyrene (dPS) and polyvinylmethylether (PVME) is investigated using a combination of small angle neutron scattering (SANS) and a novel two dimensional combinatorial method based on light scattering and corroborated by static cloud - point light scattering. The presence of up to 0.8 vol % layered silicate is found to leave the LCST phase diagram essentially unchanged, with the values of the Flory Huggins c parameter at high temperatures being nearly independent of added silicate. The presence of layered silicate led to sharper phase diagrams in the combinatorial experiments presumably because of the suppression of dewetting of the polymer from the silicon substrate and because the silicate layers act as heterogeneous nucleation sites.

Citation

Macromolecules

Volume

37

Issue

No. 2

Pub Type

Journals

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Keywords

combinatorial methods neutron scattering, layered silicates, light scatering, phase separation, polymer blend, PS-PVME

Citation

Yurekli, K. , Karim, A. , Amis, E. and Krishnamoorti, R. (2004), Phase Behavior of PS - PVME Nanocomposites, Macromolecules, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852252 (Accessed December 8, 2024)