Investigation of the modification of polyamide-6 under the action of glyoxalic acid and its salts in the medium of formic acid
Sorption properties of polyamide-6 are changed by its modification with glyoxalic acid (KG) in media of formic acid of various concentration. Formic acid also plays the role of an activator. This modification is accompanied by a considerable polymer degradation (decrease of relative viscosity). The extet of degradation increases with the increase in HCOOH concentration. Replacement of KG by its salts (Li, Na, K, Ba) lowers the rate of degradation and the products of polyamide-6 modification formed under the action of these salts exhibit an increased sorption of humidity (the degree of this increase depends of the cation in the salt) and a little decreased thermal resistance in comparison with the initial polyamide-6.
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