VAPOR PRESSURE OSMOMETRY AS A MEANS OF DETERMINING POLYMER MOLECULAR WEIGHTS

Abstract

The application of vapor pressure osmometry to the determination of molecular weights of polymers has been investigated. The principles of the theory and operation of a commercially available vapor pressure osmometer are described and the effects of reading time and drop size are analyzed. It is shown that, for calibration with benzil in dihydroperfluorobutanol at 65 C, resistance readings reached a maximum after three to four minutes and then declined slowly. Extrapolation to zero time was essential. It is further shown that drop size variations measurably effect the resistances making it desirable to account for this effect by using a standard drop size and correcting the results accordingly. Some results obtained for the measurement of molecular weights of samples of polyhexamethylene sebacamide are quoted, and a discussion of potential errors and proper experimental procedures for minimum error is given.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1966
Accession Number
AD0487755

Entities

People

  • A. C. Meeks
  • Ivan J. Goldfarb

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Calibration
  • Composite Materials
  • Governments
  • Heat Energy
  • Heat Of Vaporization
  • Latent Heat
  • Materials
  • Materials Laboratories
  • Measurement
  • Molecular Weight
  • Polymers
  • Pressure Measurement
  • Resistance
  • Standards
  • Vapor Pressure

Readers

  • Geodesy
  • Mathematics or Statistics
  • Polymer Science and Technology