The density‐gradient tube is a special glass vessel in which a vertical linear density gradient of almost any desired magnitude can be maintained in a stable condition for prolonged periods by using liquids or solutions of the proper density. This article describes the application of such a device to three typical problems appearing in the field of high polymers: crystallization‐rate data, inhomogeneities in composition of copolymers, and rates of polymerization. Possible application to still other problems is indicated.
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Boyer et al. (1946) studied this question.