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A Sound Velocity Method for Determination of Molecular Weight of Liquid Polymers

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3 Author(s)
Weissler, Alfred ; Naval Research Laboratory, Washington, D. C. ; Fitzgerald, James W. ; Resnick, Irving

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A new method is presented for determining number average molecular weights of liquid polymers, by means of easily performed measurements. The molecular weight is an explicit function

M=
 Bd 
 v
 1 
 3 
-A
 n2-1 
 n2+2 
 
of the sound velocity v, density d, refractive index n, and the two empirical constants A and B. Accuracy of about 2 parts per hundred was attained for the lower polyethylene glycols. The method seems suitable for molecular weights up to several thousand. Sound velocities were measured by an acoustic interferometer, at one megacycle frequency.

Published in:

Journal of Applied Physics  (Volume:18 ,  Issue: 5 )