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9 results on '"Sandy, Alec"'

5. “Gel-like” Mechanical Reinforcement in Polymer Nanocomposite Melts

Author

Akcora, Pinar, primary, Kumar, Sanat K., additional, Moll, Joseph, additional, Lewis, Sarah, additional, Schadler, Linda S., additional, Li, Yu, additional, Benicewicz, Brian C., additional, Sandy, Alec, additional, Narayanan, Suresh, additional, Ilavsky, Jan, additional, Thiyagarajan, Pappannan, additional, Colby, Ralph H., additional, and Douglas, Jack F., additional

Published
2009
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9. Condensed Exponential Correlation Functions in Multicomponent Polymer Blends Measured by X-ray Photon Correlation Spectroscopy

Author

L. Ruegg, Megan, J. Patel, Amish, Narayanan, Suresh, R. Sandy, Alec, G. J. Mochrie, Simon, Watanabe, Hiroshi, and P. Balsara, Nitash

Abstract

X-ray photon correlation spectroscopy experiments were conducted on bicontinuous microemulsion and lamellar phases in polystyrene/polyisoprene/poly(styrene-b-isoprene) blends. Regardless of the microstructure, the scattering intensity autocorrelation function at low temperatures in the vicinity of the primary X-ray scattering peak, g2(q,t) (qis the scattering vector), was found to be a condensed exponential, i.e., g2(q,t) ~ exp-t/(q)with > 1. This is in direct contrast to previous observations of exponential and stretched exponential correlation functions ( = 1) in microstructured materials comprising polymers as well as small molecules. At higher temperatures, more conventional stretched exponential correlation functions are recovered. We suggest that condensed exponential relaxation functions may be related to the spontaneous breakup of microsctructure.

Published
2006
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