The use of Hindered Amine Light Stabilizers (HALS) directly in polyamide 6 polymerization can cause some problems. The following two problems were the focus of our project:1) We investigated, from a theoretical point of view, the results of introducing directly one of the precursors of HALS into polyamide 6 polymerization. For the investigation, 4 amino‐2,2,6,6‐tetramethylpiperidine (triaceton‐diamine or TAD) was chosen. We considered the TAD chain‐ending effects and their influence on the total amount of amino chain‐endings that can be titrated, a parameter of primary importance in the fibre field.2) We examined the amide interchange reaction in the case of an HALS containing two amide groups, using a product available on the market, N,N′‐bis(tetramethyl‐4‐piperidyl)isophtalamide. In this case we were able to generate a couple of equations that allows one to calculate the quantity of amide interchanged HALS. This was done by comparing the results (molecular weight and chain‐endings analysis) of polymerization with and without HALS.
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