Oxo-biodegradable polyolefins show continued and increased thermal oxidative degradation after exposure to light

Vogt, N.B.; Kleppe, Emil Arne

doi:10.1016/j.polymdegradstab.2009.01.002

Cited by 50 publications

(24 citation statements)

References 10 publications

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“…In contrast, studies on the abiotic [35][36][37][38][39] and biotic [40][41][42][43] degradability of polypropylene (PP) with pro-oxidant/pro-degradant additives are scarce as yet, although being this polyolefin one of the most widely used commodity polymers.…”

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%

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 oxidative degradation process may take many years to reach complete degradation. The technologies most commonly used to accelerate the degradation process [1] involve the use of prooxidant additives (POA) to make polyolefins oxobiodegradable [2].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of the Photodegradation of Two Series of Cyclic Olefin Copolymers

Gutiérrez-Villarreal¹,

Zavala-Betancourt²

2017

International Journal of Polymer Science

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A series of commercial cyclic olefin copolymers (COC), namely, ethylene-norbornene (E-NB) and ethylene-tetracyclododecene (E-TD), were processed as thin films with thicknesses of 25 m by an extrusion process. The photodegradation of neat and formulated films with different metal stearates (Fe, Co, and Mn) was investigated using an ultraviolet (UV) light lamp (340 nm) for a period of 30 days in an accelerated weathering tester model QUV from Q-LAB according to the ASTM D 5208-01 standard practice. Changes in carbonyl index (CI) and tensile properties were used to evaluate the photodegradation of the films and other properties, such as variation by DSC, were also analyzed. The present study reveals that (E-NB) copolymers show higher sensitivity to photodegradation than (E-TD) resins, in the absence and presence of metal stearates. We also find that the Fe salt shows the highest oxidative activity.

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“…[12][13][14][15][16][17][18][19] Moreover, synergistic interactions have been studied. 20,21 However, there are no examples of degradation of oxo-biodegradable polymers using free radicals. Hydroxyl radicals (OH·) are naturally occurring highly reactive oxygen species.…”

Section: Introductionmentioning

confidence: 99%

Fast assessment of oxo-biodegradable polyethylene film oxidation by surface-enhanced Raman scattering with in situ formation of a silver nanoparticle substrate

2017

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Oxo-biodegradable polyolefins show continued and increased thermal oxidative degradation after exposure to light

Cited by 50 publications

References 10 publications

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

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

A Comparative Study of the Photodegradation of Two Series of Cyclic Olefin Copolymers

Fast assessment of oxo-biodegradable polyethylene film oxidation by surface-enhanced Raman scattering with in situ formation of a silver nanoparticle substrate

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