Title of article :
Study of relaxation mechanisms in structurally related biomaterials by thermally stimulated depolarization currents
Author/Authors :
Suلrez، نويسنده , , Nery and Brocchini، نويسنده , , Stephen and Kohn، نويسنده , , Joachim، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2001
Pages :
10
From page :
8671
To page :
8680
Abstract :
Thermal-stimulated depolarization current (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.
Keywords :
Structurally related polyarylates , relaxations , Hydration effects
Journal title :
Polymer
Serial Year :
2001
Journal title :
Polymer
Record number :
1715661
Link To Document :
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