Segmental Dynamics of Poly(styrene-b-2-vinylpyridine) in Bulk and at the Surface/Air Interface
Anionically polymerized poly( alpha-deuterostyrene) and poly(beta-deuterostyrene-b-2-vinylpyridine) (DSVP), selectively deuterated on the styrene backbone, were studied using deuterium wide-line NMR in bulk and adsorbed on silica and alumina. Changes in the segmental dynamics of the bulk and adsorbed polymers were inferred via changes in the NMR line shape with temperature. The DSVP bulk sample, which consisted of micellar aggregrates with a 2-vinylpyridine core, was more rigid than the homopolystyrene of a similar molecular weight. A significant change in mobility occurred at 20°C higher in the DSVP bulk sample than it did in homopolystyrene. The DSVP-adsorbed sample showed more restrictive mobility than bulk DSVP. The spectra of the adsorbed samples contained "rigid" Pake patterns with considerable intensity at temperatures where the collapse of the Pake pattern for the DSVP bulk sample was observed. DSVP bound to the silica surface was found to have a mobility similar to the same copolymer on alumina.
M. Xie and F. D. Blum, "Segmental Dynamics of Poly(styrene-b-2-vinylpyridine) in Bulk and at the Surface/Air Interface," Journal of Polymer Science Part B: Polymer Physics, John Wiley & Sons, Jan 1998.
National Science Foundation (U.S.)
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© 1998 John Wiley & Sons, All rights reserved.
01 Jan 1998