STUDY OF AQUEOUS DEXTRAN SOLUTIONS UNDER HIGH-PRESSURES AND DIFFERENT TEMPERATURES BY DYNAMIC LIGHT-SCATTERING

DC FieldValueLanguage
dc.contributor.authorSTANKOVIC, RI
dc.contributor.authorJOVANOVIC, S
dc.contributor.authorILIC, L
dc.contributor.authorNORDMEIER, E
dc.contributor.authorLECHNER, MD
dc.date.accessioned2021-12-23T16:13:57Z-
dc.date.available2021-12-23T16:13:57Z-
dc.date.issued1991
dc.identifier.issn00323861
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/10828-
dc.description.abstractThe behaviour of dextrans of different molar masses in aqueous solutions was investigated by dynamic light scattering at different temperatures, ranging from 30 to 100-degrees-C and different pressures, in the range 1-3000 bar. It has been shown that concentration dependence of the apparent diffusion coefficient, D(app), of all samples changes the behaviour about the overlap concentration C*. It has also been shown, that the diffusion coefficient increases with temperature (as a consequence of faster fluctuations of the molecules) and decreases with pressure. This could be accounted for by increase of solvent (water) viscosity with pressure. The activation energy of diffusion is independent of molar mass of dextran for the samples of molar masses from 7.4-21.1 x 10(6) g mol-1, but it is considerably lower for the sample of molar mass of 1.0 x 10(6) g mol-1. Pressure has a very small effect on activation energy of diffusion. The characteristic exponent for diffusion coefficient D(o) dependence on molar mass was found to be 0.32.
dc.language.isoen
dc.publisherELSEVIER SCI LTD
dc.relation.ispartofPOLYMER
dc.subjectBEHAVIOR
dc.subjectCYCLOHEXANE
dc.subjectDEXTRAN SOLUTIONS
dc.subjectDIFFUSION
dc.subjectDIFFUSION COEFFICIENT
dc.subjectDYNAMIC LIGHT SCATTERING
dc.subjectINTERMEDIATE CONCENTRATIONS
dc.subjectPolymer Science
dc.subjectPOLYSTYRENE
dc.titleSTUDY OF AQUEOUS DEXTRAN SOLUTIONS UNDER HIGH-PRESSURES AND DIFFERENT TEMPERATURES BY DYNAMIC LIGHT-SCATTERING
dc.typejournal article
dc.identifier.doi10.1016/0032-3861(91)90008-7
dc.identifier.isiISI:A1991ET32600008
dc.description.volume32
dc.description.issue2
dc.description.startpage235
dc.description.endpage240
dc.contributor.researcheridB-3854-2013
dc.identifier.eissn18732291
dc.publisher.placeTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
dcterms.isPartOf.abbreviationPolymer
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