Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
An apparatus is described for the determination of number-average molecular weights, based on the thermoelectric method as proposed by Hill. With this improved instrument, temperature differences of down to approximately 5 × 10-5°C. can be recorded. This allows determination of molecular weights up to 40,000 for the case of coiled macromolecules in a poor solvent. The accuracy of measurements, for all molecular weights, has been established by using benzene solutions of polyisobutenes of narrow and defined molecular weight distributions.
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