Calorimetric study of the conformational relaxation times in polystyrene

Citation
M. Salmeron et al., Calorimetric study of the conformational relaxation times in polystyrene, COLLOID P S, 277(11), 1999, pp. 1033-1040
Citations number
24
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
COLLOID AND POLYMER SCIENCE
ISSN journal
0303402X → ACNP
Volume
277
Issue
11
Year of publication
1999
Pages
1033 - 1040
Database
ISI
SICI code
0303-402X(199911)277:11<1033:CSOTCR>2.0.ZU;2-Y
Abstract
The temperature dependence of the relaxation times of the structural relaxa tion process of polystyrene is determined by temperature-modulated differen tial scanning calorimetry (TMDSC) and by conventional differential scanning calorimetry (DSC) in the latter by modelling the experimental heat capacit y curves measured in heating scans after different thermal histories. The g ood agreement between both measuring techniques in the temperature interval just above the glass-transition temperature is a guide for the interpretat ion of the results of the TMDSC technique in the glass-transition region. I n addition, the same model applied to DSC scans is used to simulate the TMD SC experiment and the calculated response is compared with the measured sca ns.