Oxo‐Biodegradable Polymers: Present Status and Future Perspectives

Chiellini, Emo; Corti, Andrea; D’Antone, Salvatore; Wiles, D. M.

doi:10.1002/9783527635818.ch16

Cited by 3 publications

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References 44 publications

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“…This degradation mechanism is called oxo-degradation. This term refers to a two stage process consisting of an initial oxidative degradation (which is normally abiotic), followed by the biodegradation of the oxidation products [12]. Although the abiotic and biotic degradative processes occur simultaneously, the abiotic oxidation is considered to be the rate-determining stage of the entire process.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Thermal characterization of the oxo-degradation of polypropylene containing a pro-oxidant/pro-degradant additive

Contat‐Rodrigo

2013

Polymer Degradation and Stability

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The oxo-degradation process of polypropylene (PP) samples containing different concentrations (4% and 10% w/w) of pro-oxidant/pro-degradant additive Envirocare TM AG1000C was investigated under accelerated test conditions. Samples were initially exposed to UV radiation for 300 hours. The tendency to biodegradation in soil medium of these UV-aged samples was then indirectly assessed by an indirect method for a period of 6 months. The entire degradation process of these materials was first examined by monitoring changes in their morphological properties (melting temperature, maximum lamellar thickness and crystallinity) with the aging time, by Differential Scanning Calorimetry (DSC). Then, changes in the thermal properties (onset temperature and maximum decomposition temperature) of these materials with the aging time were analysed by Thermogravimetric Analysis (TGA). Furthermore, the kinetics of the thermal decomposition of these PP samples with pro-oxidant/prodegradant was also studied during the oxo-degradation process, by means of the Chang differential method. During exposure to UV radiation, the more significant changes in the morphological and thermal properties that were detected in PP samples containing M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTpro-oxidant/pro-degradant additive compared to pure PP, clearly suggest a higher level of oxidation in these samples, confirming the effectiveness of this pro-oxidant/prodegradant additive in promoting the abiotic oxidation of polypropylene during UVirradiation. Moreover, the level of oxidation observed in UV-aged samples seems to be dependent on the additive load.On the other hand, during incubation in soil medium, changes in the morphological and thermal properties of previously photo-oxidized PP samples with pro-oxidant/prodegradant were detected that indirectly support a certain progress of oxidation, indicating that previous abiotic oxidation can promote further degradation of the polypropylene matrix by soil microorganisms. In general, both morphological and thermal properties exhibit a non-linear dependency with the incubation time in soil, supporting the idea that biodegradation is a complex process that occurs in different stages. Furthermore, the extent of the changes in these properties during soil incubation was found to be proportional to the pro-oxidant/pro-degradant load and the previous photo-oxidation level.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%