The optical properties of poly(ethylene oxide) polymer dispersed salt complex

Citation
Y. Ramadin et al., The optical properties of poly(ethylene oxide) polymer dispersed salt complex, J THERM COM, 13(6), 2000, pp. 451-459
Citations number
16
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
ISSN journal
08927057 → ACNP
Volume
13
Issue
6
Year of publication
2000
Pages
451 - 459
Database
ISI
SICI code
0892-7057(200011)13:6<451:TOPOPO>2.0.ZU;2-K
Abstract
The optical properties in the UV-visible region of poly(ethylene oxide) thi n films containing 0, 10, 20, 40 and 50% by weight Dead Sea salts are repor ted. The obtained optical results are analyzed in terms of absorption formu la for non-crystalline materials. From the optical spectra of the given pol ymeric system, the absorption coefficients have been calculated at room tem perature. The values of the optical band width (E-opt) have been obtained f rom direct allowed transitions in k-space. The width of the tail of localiz ed states in the band gap (DeltaE) was evaluated from Urbach-edges. It was found that both energy quantities (E-opt) and (DeltaE) vary with the concen tration of Dead Sea salts dispersed in the polymer matrix. Furthermore, cor relation between the energy gaps and the ac conductivity as a function of s alt complex concentration is reported.