Lösungs- und verdünnungswärmen von polyethylenglykolen in wasser und benzol, 1. Experimentelle ergebnisse

✍ Scribed by Koller, Johann ;Killmann, Erwin

• Publisher: Wiley (John Wiley & Sons)
• Year: 1981
• Weight: 669 KB
• Volume: 182
• Category: Article
• ISSN: 0025-116X
• DOI: 10.1002/macp.1981.021821220

✦ Synopsis

Abstract

Dissolution and dilution enthalpies of poly(ethylene glycol)s were measured in water and benzene, resp., by microcalorimetry. The enthalpies depend on both solute concentration and molar mass, indicating interactions between hydroxyl endgroups, ether groups and solvent molecules. Low molar mass samples form hydrogen bonds between hydroxyl and ether groups at solute concentrations of 0,003 g/cm^3^ and higher. High molar mass samples form intermolecular associates through dispersion forces at concentrations above 0,06 (benzene) and 0,1 g/cm^3^ (water).