6533b7d7fe1ef96bd12683e1
RESEARCH PRODUCT
Continuous fractionation of poly[(dimethylimino)decamethylene bromide] and molecular weight dependence of the glass transition
Gerhard WegnerWolfgang H. MeyerBernhard A. WolfKlaus Schultessubject
Aqueous solutionChromatographyMolar massPolymers and PlasticsIntrinsic viscosityOrganic ChemistryCondensed Matter PhysicsSolventchemistry.chemical_compoundDifferential scanning calorimetrychemistryBromidePolymer chemistryMaterials ChemistryDiisopropyl etherPhysical and Theoretical ChemistryGlass transitionNuclear chemistrydescription
30 g of the ionene poly[(dimethylimino)decamethylene bromide] were fractionated by a continuous counter-current extraction method (CPF) using ethylene glycol monoethyl ether as the solvent and diisopropyl ether as the non-solvent component. The efficiency of the separation was checked by viscometry and gel-permeation chromatography (GPC) measurements. Eight fractions of different molar mass were prepared for differential scanning calorimetry (DSC) experiments. With bromide as counter-ion, the glass transition temperature of the ionene increases from ca. 60 to 85°C as the intrinsic viscosity of this material (in 0,4 M aqueous solutions of KBr at 25°C) rises from ca. 14 to 22 mL/g. When bromide is replaced by tetrafluoroborate, the glass transition temperature remains almost constant at ca. 60°C, irrespective of the molar mass of the ionene.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-04-01 | Macromolecular Chemistry and Physics |