6533b854fe1ef96bd12ae9e4
RESEARCH PRODUCT
Dielectric spectroscopy measurements of the sub-Tg relaxations in amorphous ethyl cellulose: A relaxation magnitude study
Dominique ChampionO. BidaultAli AssifaouiM. Le Mestesubject
PermittivityMaterials sciencePolymers02 engineering and technologyDielectric010402 general chemistryDielectric loss and relaxation01 natural scienceschemistry.chemical_compoundNuclear magnetic resonanceEthyl celluloseOrganic compoundsMaterials ChemistryElectrical and magnetic properties[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesElectronic Optical and Magnetic MaterialsAmorphous solidDielectric spectroscopychemistryChemical physics[ CHIM.MATE ] Chemical Sciences/Material chemistryCeramics and CompositesRelaxation (physics)Dielectric lossPACS: 77.22.Gm; 77.84.Jd; 81.40.Rs0210 nano-technologyGlass transitiondescription
Amorphous ethyl cellulose exhibits three secondary relaxations at temperatures below its glass transition. The fitted parameters that describe these processes and the comparison with other polysaccharides allow to ascribe the relaxations to lateral groups on one hand and to local main chain motion on the other hand. Their contributions to the dielectric constant overlap and induce a broad dielectric losses peak. The amplitude of one of these relaxations is found to decrease regularly with time. It is believed it comes from a gradual change of the polar groups chemical environment that constrains their motion.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-05-01 |