Nylon 1,6

However, the reaction is exothermic, and especially at high ratios of formaldehyde to adiponitrile, cooling may be required.

The DuPont evaluations of the 1950s era indicated that polyamide-1,6 was less acid stable than nylon 66, and melts over 300–325 °C, with some decomposition.

[3] The polymer was believed to be significantly branched and cross-linked owing to side reactions occurring during the acid catalyzed polymerization, but this was not conclusively established.

Similar to other formaldehyde-based thermoset resins, thermal behavior of the polymer is a function of the CH2O/ADN ratio employed in the synthesis.

Additionally, spectral features of 1H-NMR of nylon 1,6 samples were found to trend with CH2O/ADN synthesis ratio as well.