Molecular mobility and hydration properties in polyurethane and styrene-acrylonitrile blends

Author

Kanapitsas, A. ; Pissis, P.

Author_Institution

Dept. of Phys., Nat. Tech. Univ. of Athens, Greece

fYear

1999

fDate

1999

Firstpage

485

Lastpage

488

Abstract

Dielectric measurements by means of thermally stimulated depolarization currents (TSDC) techniques in the temperature range 90-300 K were used to study molecular mobility and morphology in blends of polyurethanes based on branched polymer polyol (PUR) and styrene-acrylonitrile copolymer (SAN) with different SAN content. Water sorption/desorption isotherms both in equilibrium (ESI) and dynamic (DSI) were used to measure isothermal water uptake and diffusion coefficients. Water sorption has a significant influence on the γ and β relaxations. With increasing water content the MWS peak shifts to lower temperatures. For all samples studied the amount of water at saturation was found to decrease with increasing temperature and SAN content in the blends

Keywords

desorption; dielectric relaxation; diffusion; polymer blends; thermally stimulated currents; β relaxation; γ relaxation; 90 to 300 K; branched polymer polyol; diffusion coefficient; hydration; isothermal water uptake; molecular mobility; morphology; polyurethane; sorption/desorption isotherms; styrene-acrylonitrile blends; thermally stimulated depolarization currents; water content; Current measurement; Dielectric measurements; Morphology; Physics; Polarization; Polymers; Storage area networks; Temperature distribution; Temperature measurement; Water;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on

Conference_Location

Athens

Print_ISBN

0-7803-5025-1

Type

conf

DOI

10.1109/ISE.1999.832090

Filename

832090