Molar Mass and Second Virial Coefficient of Polyethylene Glycol by Vapor Pressure Osmometry

• Jeffrey J. Schwinefus ^[1] ; Caleb Checkal ^[2] ; Brian Saksa ^[1] ; Nadia Baka ^[1] ; Kalpit Modi ^[1] ; Carlos Rivera ^[1]
  1. [1] St. Olaf College

     St. Olaf College

     City of Northfield, Estados Unidos

     
  2. [2] International Chemtex Corporation, United States
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 92, Nº 12, 2015, págs. 2157-2160
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • In this laboratory experiment, students determine the number-average molar masses and second virial coefficients of polyethylene glycol (PEG) polymers ranging in molar mass from 200 to 1500 g mol–1 using vapor pressure osmometry (VPO). Students assess VPO in relation to accurate molar mass calculations of PEG polymers. Additionally, students use the second virial coefficients to identify any PEG self-interactions and any dependence of the second virial coefficient on PEG molar mass. This laboratory experiment is suitable for a biophysical or physical chemistry laboratory.