Polyamide‐6 (PA‐6) and sulfonated polystyrene (SPS) interact strongly in solution. Thus, solution blends of PA‐6 and SPS (sulfonation levels from 0 to 12.3 mol%) in m‐cresol form clear, hazy, or gelled solutions–depending on the ratio of amide (A) to sulfonic acid (S) groups (A/S). NMR studies show that the S groups interact with the nitrogen of the amides, most probably through the transfer of the sulfonic acid protons. During melt blending, the addition of SPS to the PA‐6 leads to a torque rise bec…
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