Study of relaxation mechanisms in structurally related biomaterials by thermally stimulated depolarization currents

Suárez, N., Brocchini, S. and Kohn, J.B. (2001) Study of relaxation mechanisms in structurally related biomaterials by thermally stimulated depolarization currents. Polymer, 42 (21). pp. 8671-8680. 10.1016/S0032-3861(01)00437-2.

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DOI: 10.1016/S0032-3861(01)00437-2

Abstract

Thermal-stimulateddepolarizationcurrent (TSDC) experiments were performed on a series of tyrosine-derived polyarylates with different number of methylene groups in the backbone. The low temperature TSDC spectra (80–240 K) were analyzed at two different degrees of hydration to assess the effects of small amounts of loosely and tightly bound water in the observed complex β band. Higher temperature TSDC spectra (250–350 K) provided the α relaxation peaks associated with the glass transition temperature. The direct signal analysis (DSA) method allowed the deconvolution of the peaks into elementary processes and the determination of their mean relaxation parameters. The variations in the low and high temperature polarization with the number of backbone methylene groups were interpreted as a combination of flexibility and entanglement phenomena. The dielectric manifestation of the disentanglement effects was observed for the case of the longest polymer.

Item Type:Article
Uncontrolled Keywords:Structurallyrelated polyarylates; Relaxations; Hydration effects
Departments, units and centres:Department of Pharmaceutics > Department of Pharmaceutics
ID Code:3305
Journal or Publication Title:Polymer
Deposited By:Library Staff
Deposited On:25 May 2012 12:20
Last Modified:25 May 2012 12:20

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