ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
For the viscometric determination of the molecular weight of a flexible linear high polymer, a very “poor” solvent in which the osmotic slope constant B is zero (i.e., a so-called “ideal” solvent) has several advantages over the usually preferred good ones. For example, shear effects that are very troublesome with very high polymers in good solvents become negligible or easily manageable. Moreover, in an “ideal” solvent, the “contents” K and a in the equation relating [η] and M really are constant over a very wide range of molecular weights and, since a always has the value 0.50, are more easily determined. Because the advantages seem to outweigh considerably the disadvantages, the use of an “ideal” solvent should be given careful consideration, particularly when the molecular weights are very high or cover a wide range.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1954.120136815
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