Publications [#233678] of Richard A. Palmer

Journal Articles

  1. Wang, Y; Schoonover, JR; Aubuchon, SR; Palmer, RA, "Dynamic Mechanical Analysis and Dynamic Infrared Linear Dichroism Study of the Frequency - Dependent Viscoelastic Behavior of a Poly (ester urethane)", Vibrational Spectrosc., 2005, 42(1), 74-77, Elsevier BV [Gateway.cgi], [doi].
    (last updated on 2024/11/19)

    Abstract:
    Dynamic infrared linear dichroism (DIRLD) data have been collected as a function of strain modulation frequency in a simultaneous DIRLD-dynamic mechanical analysis experiment. The frequency range is limited, but the DIRLD data indicate some similarities to the temperature-dependent data. The frequency-dependent infrared data do not show the direct correlation with the mechanical data that was evident in the temperature-dependent study. However, the frequency-dependent infrared data do provide some molecular insight, with a similarity to the temperature-dependent results in the 1800-1320 cm-1 region, a quadrature signal increasing with increasing frequency in the 1320-1000 cm-1 region, and complex changes in the low wavenumber region that are interpreted as polymer chain responses as a function of frequency. © 2006 Elsevier B.V. All rights reserved.