Effect of plasticizers on the properties of polycaprolactam was written by Poludennaya, V. M.;Volkova, N. S.;Arkhangel’skii, D. N.;Konkin, A. A.. And the article was included in Khimicheskie Volokna in 1969.Reference of 5339-69-5 This article mentions the following:
High-mol.-weight polycaprolactam (I) gives stronger cord, but it has increased viscosity (η) and presents difficulties in spinning. The addition of ≤20% PhSO2NHPr-iso, p-EtC6H4SO2NHPr-iso, or 2,4-Et2C6H3SO2NHPr-iso to ε-caprolactam, prior to the polymerization, decreased η of I melt without decreasing its mol. weight Thus I of mol. weight 30,000 without the plasticizer had η = 11,000 poises; the addition of 5-7% plasticizer decreased η to 6000-5000 poises, which is sufficient for spinning I melt in standard equipment. In the experiment, the researchers used many compounds, for example, N-Isopropylbenzenesulfonamide (cas: 5339-69-5Reference of 5339-69-5).
N-Isopropylbenzenesulfonamide (cas: 5339-69-5) belongs to amides. In primary and secondary amides, the presence of N–H dipoles allows amides to function as H-bond donors as well. Thus amides can participate in hydrogen bonding with water and other protic solvents; the oxygen atom can accept hydrogen bonds from water and the N–H hydrogen atoms can donate H-bonds. Amides can be freed from solvent or water by drying below their melting points. These purifications can also be used for sulfonamides and acid hydrazides.Reference of 5339-69-5
Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics