Polymer degradation photooxidation

Girois, S. Delprat, P. Audouin, L. Verdu, J. Oxidation thickness profiles during the photooxidation of non-photostabilized polypropylene. Polym. Degrad. Stab. 1997, 56, 169-177. 

Volume 14 deals with all aspects of polymer degradation, classified on the basis of the method of initiation for the process. Thus, Chapter 1 covers thermal degradation, Chapter 2 radiolysis initiated by high-energy radiation such as X- and 7-radiation and electrons, Chapter 3 photodegradation arising from exposure of polymers to visible or ultraviolet radiation and Chapter 4 discusses oxidative degradation, oxidation and photooxidation. 

J.-L. Gardette, C. Sinturel, and J. Lemaire, Photooxidation of fire retarded polypropylene, Polym. Degrad. Stab. 1999, 64, 411—417. 

G. Geuskens, P. Bastin, Q. Lu Vinh, and M. Rens, Photooxidation of polymers. Part IV. Influence of the processing conditions on the photooxidative stability of polystyrene, Polym. Degrad. Stab. 1981, 3, 295-306. 

Prediction of moisture diffusion parameters in polymers undergoing photooxidative degradation is considered to be of somewhat lesser significance than sorption predictions for three reasons. First, it seems probable that the occurrence of anomalous sorption-diffusion behavior may be expected in most polymer... 

In the presence of oxygen or ozone, as soon as free radicals form, oxygenation of the radicals gives rise to peroxy radicals, which through a complex series of reactions result in polymer degradation. Oxidative degradation may occur at moderate temperature (thermal oxidation) or under the influence of ultraviolet radiation (photooxidation). Unsaturated polyolefins are particularly susceptible to attack by oxygen or ozone (Equation 9.6). 

R. Arnaud, P. Dabin, J. Lemaire, S. Al-Malaika, S. Chohan, M. Coker, G. Scott, A. Fauve and A. Maaroufi, Photooxidation and biodegradation of commercial photodegradable polyethylenes, Polym. Degrad. Stabii, 1994, 46,211. 

Amaud R., Dabin P., Lemaire J., Al-Malaika S., Chohan S., Coke M., Scott G., Fauve A., Maaroufi A., Photooxidation and biodegradation of commercial photodegradable polyethylenes, Polym. Degrad. Stab., 46, 1994,211-224. 

Yakimets I, Lai D, Guigon M. Effect of photooxidation cracks on behavior of thick polypropylene samples. Polym Degrad Stab 2004 86 59-67. 

N. T. Dintcheva, S. Al-Malaika, and F. P. La Manila, Effect of extrusion and photooxidation on polyethylene/clay nanocomposites. Polymer Degradation and Stability, 94 (2009), 1571-88. 

Eourier transform infrared spectroscopy is a well-established method for investigating polymer degradation, because of its ability to detect stable degradation products, hi the photooxidation of polystyrene and poly(a-methylstyrene), for example, absorptions... 

Morlat-Therias, S. Mailhot, B. Gardette, J.-L. Da Silva, C. Haidar, B. Vidal, A. Photooxidation of ethylene-propylene-diene/montmorillonite nanocomposites. Polym. Degrad. Stab. 2005, 90, 78-85. 

Malajati Y, Therias S, Gardette J (2011) Influence of water on the photooxidation of KHJ phenoxy resins, 1. Mechanisms. Polym Degrad Stab 96 144-150... 

Allen, N. S., Edge, M. et al. Effect of processing on the thermal and photooxidative behaviour of 2-hydroxybenzophenone stabilizers in polyolefin fihns Influence of 2,2,6,6-tetramethylpiperidine, Polymer Degradation and Stability, 44 (1994), p. 99 - 105... 

J Pospisil, S Nespurek. Polym Degrad Stab, 1996 54 7-14 1997 54 15-21 Adv Polym Sci 1980 36 69 Photooxidation reactions of phenolic antioxidants. In NS Allen, ed. Developments in Polymer Chemistry Vol 2. London Applied Science Publication, 1981, p 53. Yu A Shlyapnikov, NK Tyuleneva. Intern J Polym Mater 1997 36 (1,2) 119-129. 

Gijsman P, Diepens M. Photolysis and photooxidation in engineering plastics. ACS Symp Series 2009 1004 287-306. [Polymer Degradation and Performance]. 

Delprat P, Duteurtre X, Gardette JL. Photooxidation of unstabilized and HALS-stabiUzed polyphasic ethylene-propylene polymers. Polym Degrad Stab 1995 50 1-12. 

These results suggest the possibihty of using degraded (photooxidized) polyethylene, from recycling of Qms for greenhouses, as a functionalized polymer to obtain compatibihzed nylon/polyethylene blends. 

Konaganti, V.K., Madras, G. Photooxidative and pyrolytic degradation of methyl methacrylate-alkyl acrylate copolymers. Polym. Degrad. StabiL 94, 1325-1335 (2009)... 

Valadez-Gonzalez, A., Cervantes-Uc, J.M., Veleva, L. Mineral influence on the photooxidation of high density polyethylene. I accelerated UV chamber exposure test. Polym. Degrad. Stab. 63, 253-260 (1999)... 

Pilar, J., Michalkova, D., Sedenkova, I., Pfleger, J., Pospisil, J. NOR and nitroxide-based HAS in accelerated photooxidation of carbon-chain polymers Comparison with secondary HAS an ESRI and ATR FUR smdy. Polym. Degrad. Stab. 96, 847-862 (2011)... 

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