6533b862fe1ef96bd12c6c0e
RESEARCH PRODUCT
On The Incompatibility of Dextran and Pullulan in Aqueous Solutions and Its Modeling
Anja EckeltWolfgang SchärtlJohn EckeltBernhard A. Wolfsubject
chemistry.chemical_classificationTernary numeral systemAqueous solutionMolar massPolymers and PlasticsChemistrySpinodal decompositionOrganic ChemistryThermodynamicsPullulanPolymerCondensed Matter PhysicsMiscibilitychemistry.chemical_compoundDextranPolymer chemistryMaterials ChemistryOrganic chemistryPhysical and Theoretical Chemistrydescription
Joint aqueous solutions of branched dextran and linear pullulan are investigated with respect to their phase separation. The experiments demonstrate that the polymers are – depending on the molar mass of dextran – incompatible in aqueous solutions despite their chemical similarity. This finding can be modeled on the basis of an approach accounting for chain connectivity and conformational relaxation of the components. According to these calculations, the polymers exhibit a miscibility gap in joint solutions despite the favorable interactions between them. Using information on the subsystems H2O/dextran and H2O/pullulan, the assumption of complete miscibility of the polysaccharides is required to model the observed phase separation. This analysis predicts the existence of two islands of immiscibility for the ternary system.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-05-09 | Macromolecular Chemistry and Physics |