Tyagi, M.
, Casalini, R.
and , C.
(2017),
Short Time and Structural Dynamics in Polypropylene Glycol Nanocomposite, Rubber Chemistry and Technology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923119
(Accessed April 25, 2024)
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Short Time and Structural Dynamics in Polypropylene Glycol Nanocomposite
Published
Author(s)
, R. Casalini, C. M. Roland
Abstract
The dynamics of polypropylene glycol, both neat and attached to silica nanoparticles, were investigated using elastic neutron backscattering and dielectric spectroscopy. The mean square displacement measured by the former is suppressed by the particles at temperatures corresponding to a dielectric secondary relaxation (that involves only a portion of the repeat unit) and the segmental relaxation (glass transition). Despite the suppression of the displacements, the motions are faster in the nanocomposite, primarily due to poorer packing (lower density) at the particle interface. At very low temperatures we discovered a new dynamic process in the polymer. Reflecting its very local nature, this process is unaffected by attachment of the chains to the silica.Citation
Rubber Chemistry and Technology
Volume
90
Issue
2
Pub Type
Journals
Download Paper
Keywords
nano composites, neutron scattering, dielectric
Citation
Created June 1, 2017, Updated November 6, 2017