La impureza Caprolactam Dimer Impurity (CAS 2014-58-6) es un dímero de caprolactama que se forma como subproducto durante la síntesis y el tratamiento térmico del monómero; su mayor peso molecular y estructura cíclica modifican solubilidad y reactividad | afectando la polimerización y provocando cambios en la distribución de masas molares | amarilleo y defectos físicos. Su identificación y cuantificación se realizan por HPLC | GC-MS | RMN y FTIR | y su control exige estrategias de purificación como cristalización fraccionada | destilación a presión reducida | adsorción en carbón activado e intercambio iónico. Mantener niveles en trazas es crítico para la calidad del polímero final.
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