Thermal and photo-chemical oxidation of nylon 6,6: Some aspects of the importance of α,β-unsaturated carbonyl groups and hydroperoxides
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2013, Polymer Degradation and StabilityCitation Excerpt :Water is commonly observed as an oxidative degradation end product in polymeric materials. In fact, water has been reported numerous times as a thermal oxidation product of polyamides [16,31,36]. We detected 18O labeled water from nylon subjected to thermal aging under an atmosphere of 18O2, consistent with the expectation of an extensive series of reactions of the polymer, involving the oxygen in the atmosphere.
Thermal-oxidative degradation of polyamide 6,6 containing metal salts
2010, Polymer Degradation and StabilityCitation Excerpt :Aldehydes are produced during thermal and photolytic cleavage of the amide bonds [41], and as decomposition products of imides. However, they can be converted into carboxylic acids and α,β-unsaturated carbonyls [42–44] via crotonization or formation of polyimines or oligoenimines from aldehydes and amino groups, accounting for the observed decrease in absorbance between 1270 and 2400 h. It is worth noticing that the 1725 cm−1 absorption seems to increase at longer aging times, suggesting that it could be related to stable secondary oxidation products.
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