Abstract
Using Small-Angle Neutron Scattering (SANS) we first, studied Methylmethacrylate (MMA) gels with no free chains of polystyrene (PSD) inside them. Gels show increased scattering compared to the solutions, contrary to the predictions of the classical theories. Second, linear PSD chains (their c<c*) were introduced in the system: again increased scattering is observed from chains in the gel compared to the chains in an equivalent semi-dilute solution. These results imply that when the translational entropy of free PSD chains is weak (especially for the larger ones) they would tend to mix less efficiently with the gel than with the solution. At low q, the scattering from the PSD chains increases with molecular weight and progressively tends to a master curve varying as q-2.5. We discuss an explanation of this effect in terms of the percolation model of heterogeneities. The larger molecular weight PSD chains define the contour of the large percolation clusters in the gel.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
J. Lal, J. Bastide, R. Bansil and F. Boué, Macromolecules, 26: 6092 (1993).
J. Bastide and L. Leibler, Macromolecules, 21: 2647 (1988).
F. H. Zielinski, M. Buzier, C. Lartigue, J. Bastide, and F. Boué, Prog. Coll. & Pol. Sci. 104, (1992).
M. Daoud, and L. Leibler, Macromolecules, 21: 1497 (1988).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1994 Springer Science+Business Media New York
About this chapter
Cite this chapter
Lal, J., Bastide, J., Bansil, R., Boué, F. (1994). The Revealing of Heterogeneities by Free Linear Chains in a Network. In: Rabin, Y., Bruinsma, R. (eds) Soft Order in Physical Systems. NATO ASI Series, vol 323. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2458-8_9
Download citation
DOI: https://doi.org/10.1007/978-1-4615-2458-8_9
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-6046-9
Online ISBN: 978-1-4615-2458-8
eBook Packages: Springer Book Archive