Concerning the ρ relaxation amorphous PET crystallization by thermally stimulated discharge

Author

Belana, J. ; Colomer, P.

Author_Institution

Escuela Tecnica Superior de Ingenieros Ind., Barcelona, Spain

fYear

1988

fDate

1-3 Sep 1988

Firstpage

286

Lastpage

290

Abstract

The thermal depolarization of amorphous PET (polyethylene terephthalate) electrets metallized on one side and corona charged at T_p>70°C exhibits, between 20°C and 105°C, three relaxations: α, ρ₁ and ρ₂. The origin of ρ₂ is free charge injected from the electrodes, while ρ₁ could be associated with a uniform bulk mechanism. The p₁ peak has a been located in electrets metallized on both sides and polarized, between 73°C and 79°C, only in the isothermic phase, so that at T_p>79°C it overlaps with ρ. The stimulated crystallization by thermal steps in amorphous PET samples, metallized on both sides, indicates that ρ₁ changes with the crystallinity and becomes the α_c relaxation of the crystalline PET

Keywords

crystallisation; dielectric depolarisation; electrets; polymers; ρ relaxation; 20 to 105 degC; amorphous PET crystallization; corona charged; electrets; free charge; isothermic phase; mechanism; metallized; polyethylene terephthalate; thermal depolarization; thermally stimulated discharge; Amorphous materials; Corona; Crystallization; Electrets; Metallization; Polarization; Polyethylene; Positron emission tomography; Space charge; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)

Conference_Location

Oxford

Type

conf

DOI

10.1109/ISE.1988.38565

Filename

38565