Studies of the process of polyamide-6 degradation with sodium glyoxalate in acidic medium
The degradation behaviour of polyamide-6 in a homogeneous system of aqueous solutions of formic acid and in the presence of sodium glyoxalate has been studied by the determination of relative viscosity in solution. It has been found that the degree of polymer degradation increases with the increase of formic acid concentration, the sodium glyoxalate: polyamide-6 molar ratio, process temperature and duration of the process. The lower limiting temperatures of dissolution of polyamide-6 in aqueous solutions of formic acid of various concentrations have been determined. High concentrations of polymer in solutions have been endevoured. The effect of the dissolution process itself on degradation of polyamide-6 has also been determined — no degradation takes place below 60°C.
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