Title :
Comparative study of poly-dialkyl itaconates by TSDC and TW
Author :
Espinosa, Gustavo Dominguez ; Sanchis, M.J. ; Diaz-Calleja, R. ; Gargallo, L. ; Radic, D.
Author_Institution :
Departamento de Termodinamica Aplicada, Univ. Politecnica de Valencia, Spain
Abstract :
The dielectric activity of poly-dimethyl itaconate (PDMI), poly-diethyl itaconate (PDEI) and poly dipropyl itaconate (PDPI) has been carried out by thermo stimulated discharge current (TSDC) techniques. Two relaxational zones are found. The TSDC global spectra corresponding to PDMl, PDEI and PDPI exhibit a moderate subglass relaxation, related to motion of ester side groups. Moreover, prominent peaks associated with the glass-rubber transition located at 368K, 320K and 308K, respectively, are observed. More detailed information about the fine structure of the subglass processes has been obtained by partial depolarization of poling samples (Thermal windows, TW). By fitting the experimental data to standard models, the kinetic parameters of the relaxations observed for each polymer, have been evaluated. Finally, a comparative study of the poly-dialkyl itaconates, are discussed in terms of molecular mobility.
Keywords :
dielectric polarisation; dielectric relaxation; fine structure; glass transition; polymers; rubber; thermally stimulated currents; 308 K; 320 K; 368 K; TSDC global spectra; dielectric activity; ester side groups; fine structure; glass-rubber transition; kinetic parameters; moderate subglass relaxation; molecular mobility; partial depolarization; poly dipropyl itaconate; poly-dialkyl itaconates; poly-diethyl itaconate; poly-dimethyl itaconate; polymer; relaxational zones; subglass processes; thermal windows measurement; thermo stimulated discharge current techniques; Current measurement; Dielectrics; Fault location; Information analysis; Kinetic theory; Polarization; Polymers; Spectroscopy; Temperature distribution; Windows;
Conference_Titel :
Solid Dielectrics, 2004. ICSD 2004. Proceedings of the 2004 IEEE International Conference on
Print_ISBN :
0-7803-8348-6
DOI :
10.1109/ICSD.2004.1350298
