Title :
Electret state of butadiene-styrene copolymers
Author :
Capelletti, R. ; Pospisil, J.
Author_Institution :
Dept. of Phys., Parma Univ., Italy
Abstract :
Thermally stimulated depolarization currents (TSDC) in the range of 120-350 K are exploited to study triblock and statistical styrene-butadiene copolymers. TSDC peaks occur at the butadiene phase glass transition, due to the reorientation of butadiene dipolar groups. The peak is accounted for by a distribution of relaxation times. In block copolymers the TSDC signal is monitored at the butadiene phase transition temperature even if the sample is not previously polarized. Ordering effects induced by the sample preparation are discussed
Keywords :
dielectric depolarisation; electrets; glass transition (polymers); molecular reorientation; polymer blends; thermally stimulated currents; 120 to 350 K; TSDC peaks; butadiene phase glass transition; butadiene-styrene copolymers; dipolar group reorientation; electret state; ordering effects; relaxation times distribution; sample preparation; statistical copolymers; thermally stimulated depolarisation currents; triblock copolymers; Computational Intelligence Society; Electrets; Electric variables measurement; Glass; Microstructure; Monitoring; Performance evaluation; Physics; Polarization; Temperature distribution;
Conference_Titel :
Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)
Conference_Location :
Oxford
DOI :
10.1109/ISE.1988.38613
