Title :
Melting and crystallisation of a liquid crystalline copolyester and a homopolymer studied by dielectric spectroscopy and DC-measurements
Author :
Willems, C. ; van Turnhout, J.
Author_Institution :
Dept. of Polymer Technol., Delft Univ. of Technol., Netherlands
Abstract :
The relation between the degree of crystallinity and the dielectric properties of semicrystalline polymers has been discussed in many publications. The subject of this paper is the change in dielectrical properties during crystallisation and melting, including a comparison between the ohmic AC-conductivity calculated from the dielectric data and the directly measured DC-conductivity. The phenomena occurring in polyethylene terephthalate (PET), a semicrystalline homopolyester, are compared with those of a liquid crystalline copolyester
Keywords :
polymers; DC-conductivity; PET; crystallinity; crystallisation; dielectric spectroscopy; liquid crystalline copolyester; melting; ohmic AC-conductivity; polyethylene terephthalate; semicrystalline homopolymer; Crystallization; Dielectric constant; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Frequency; Liquid crystal polymers; Polarization; Positron emission tomography; Temperature;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1994., IEEE 1994 Annual Report., Conference on
Conference_Location :
Arlington, TX
Print_ISBN :
0-7803-1950-8
DOI :
10.1109/CEIDP.1994.592057
