Stabilization of polyamides IV. Thermo-oxidation of hexano-6-lactam in the presence of alkali metal salts

Lánská, B.; Matisová‐Rychlá, L.; Rychlý, Jozef

doi:10.1016/j.polymdegradstab.2004.10.001

Cited by 14 publications

References 25 publications

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Antioxidants, Polymers

Kröhnke

Zäh

2022

Kirk-Othmer Encyclopedia of Chemical Technology

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Organic matter is subject to decomposition, particularly through reaction with oxygen. This leads to several reactive secondary products such as hydroperoxides and peroxy and alkoxy radicals. Antioxidants are used to slow down oxidative degradation by reacting with these reactive intermediates. On the one hand, this article explains the mechanism of the oxidation of polymers and, on the other hand, describes suited antioxidants and their influence on the stabilization of polymers during their processing in the melt and during their service life. Suitable antioxidants, including combinations of antioxidants, which act as free‐radical scavengers (primary antioxidants) and hydroperoxide or peroxide scavengers (secondary antioxidants), are explained. Traditional commercial antioxidants still play a role when used in industrially manufactured polymers. Moreover, the stabilization of polymer recyclates against oxidative degradation is gaining in importance. Furthermore, in recent years, unconventional antioxidants of natural origin have also increasingly come into focus. Methods for the analytical determination of antioxidants in polymeric substrates are also described, with which the consumption and effectiveness of these products can be examined.

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Antioxidants, Polymers

Kröhnke

Zäh

2022

Kirk-Othmer Encyclopedia of Chemical Technology

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2012

Oxidative Ageing of Polymers

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Modification of melt, light, and heat stability of polyamide 6 by hindered piperidine amine and tertiary amine

Guo

Yao-ming

Ning

et al. 2006

J of Applied Polymer Sci

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Hindered piperidine amine (HPA) and tertiary amine (TA) were introduced into hydrolytic polymerization of caprolactam, and polyamide 6 (PA 6) modified by additives [HPA/TA ¼ 1 : 1 (w/w)] was obtained. The effects of additives on the melt, light, and heat stability of PA 6 were studied. The results showed that with an increase in additive content, the viscosity of PA 6 increased and the elastic response decreased. Thus, the drawing property of PA 6 fibers during melt spinning was improved. With the addition of 0.1%-0.2% additives, the degree of variation in amino end group content and relative viscosity decreased during the process going from resin to fiber, indicating the modified PA 6 had improved melt stability. During light and heat aging, the ratio of retained fracture strength of PA 6 filament increased after modification by 0.1%-0.4% additives. Scanning electron microscopy showed that the surface morphology of the modified fiber remained almost the same, whereas that of the unmodified fiber was seriously destroyed when exposed to xenon light for 8 days or heated to 1808C in air for 1.5 h. The degree of variation of relative viscosity of the PA 6 fiber also decreased after modification by 0.1%-0.2% additives under oxidative degradation. All these results indicate PA 6 had better melt, light, and heat stability when modified by additives.

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Stabilization of polyamides IV. Thermo-oxidation of hexano-6-lactam in the presence of alkali metal salts

Cited by 14 publications

References 25 publications

Antioxidants, Polymers

Antioxidants, Polymers

Bibliography

Modification of melt, light, and heat stability of polyamide 6 by hindered piperidine amine and tertiary amine

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