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The amine end groups of polyamide 6 (PA-6) granules were blocked with succinic anhydride (SA) in supercritical or subcritical fluids. The fluids were mixtures of either propane or CO 2 with 10 mol% 1,4-dioxane. Temperatures of 50-140 o C and pressures of 70-80 bars were applied. The reactions were followed in time. The modified polyamide samples were analysed by amine end group titrations,...
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