Abstract
Unlike crystalline solids, polymeric solids do not undergo first order phase changes upon being heated but they undergo relaxational transitions which exhibit rather sudden changes in both the distribution of mechanical relaxation times as well as changes in certain thermodynamic properties. These transitions appear to involve either changes in the motion of the backbone or the side chains and their determination is strongly dependent upon the frequency of the detection method and other extrinsic factors. This paper deals with the detection of these transitions in amorphous solids in the gigahertz range using acoustical phonons as a probe. The relationship of observed phonon velocities and scattering intensities to bulk properties is investigated and in certain cases it has also been possible to associate relaxational transitions with internal degrees of freedom in the sub-skeletal or side chain regions. A theory is employed which accounts for changes observed in the Landau-Placzek ratio, absorption coefficients, and phonon velocities as temperature and phonon frequencies are varied.
Partially supported by U.S.A.F. Rocket Propulsion Laboratory, Edwards A.F. base contract No. FO4611-68-C-0019
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Gayles, J.N., Peticolast, W.L. (1969). Studies of Viscoelastic Relaxation Processes in Linear Polymers by Means of Brillouin Scattering. In: Wright, G.B. (eds) Light Scattering Spectra of Solids. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87357-7_78
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