Influence of the nature of pro-oxidants on the photooxidation of polyethylene blown films

Brandão, João Augusto Osório; Morisso, Fernando Dal Pont; Francisquetti, Edson Luiz; Santana, Ruth Marlene Campomanes

doi:10.1016/j.heliyon.2022.e10217

Cited by 3 publications

(3 citation statements)

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“…The absorption found in the range 3000-3600 cm −1 indicated the existence of O-H groups (because of the formation of hydroperoxides and alcohols during oxidation reactions), which was more pronounced in the oxo-biodegradable polyethylene after biodegradation in the pond and suggested partial water affinity. The observed changes in the spectra suggested the appearance of oxidation and degradation of the used material [49][50][51][52][53][54].…”

Section: The Changes Of Oxo-biodegradable Polyethylene During Environ...mentioning

confidence: 92%

“…Further changes occurred at the band (1461 cm −1 ) related to CH 2 scissoring groups, and at the bands (717 cm −1 ) indicating CH 2 rocking vibration. The other small absorption, at 1040 and 1082 cm −1 , belongs to some C-O bonds that appeared due to the atmospheric oxidation of the investigated polyethylene surface after degradation in natural environments: pond and weathering [49][50][51][52][53][54]. In the natural weathering environment, abiotic parameters played the dominant degradative role, while in the pond the changes in the incubated polymer were the result of both abiotic parameters and the presence of microorganisms (biofilm penetration) [45].…”

Section: The Changes Of Oxo-biodegradable Polyethylene During Environ...mentioning

confidence: 99%

“…CI-absorbance ratio of carbonyl and methylene groups. This makes it possible to determine the amount of carbonyl compounds formed during the photo-oxidation process [50,52,55].…”

Section: The Changes Of Oxo-biodegradable Polyethylene During Environ...mentioning

confidence: 99%

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Environmental Degradation of Oxo-Biodegradable Polyethylene Bags

Heimowska

2023

Water

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The purpose of the present study is the estimation of the environmental degradation process of oxo-biodegradable polyethylene bags. The degradation process of polyethylene samples, with the addition of a d2w prodegradant, was studied under natural weathering, freshwater (pond), and water in laboratory condition for a period of 48 months. The impact of characteristic parameters of environments on the extent of degradation, monitored by weight changes, mechanical properties, and surface morphology, has been discussed. The degraded polymer samples were also analyzed by FTIR spectroscopy. It was established that the oxo-biodegradable polyethylene samples were hardly prone to degradation in natural freshwater, but more vulnerable to environmental weathering. Abiotic parameters (oxygen, temperature, solar radiation) played a more important role in the degradation process of oxo-biodegradable polyethylene than biotic parameters (microorganisms). Natural weathering led to first fragmentation of the polymeric samples after 18 months, weight loss to 81.6% after 39 months, and complete assimilation after 45 months. In the pond, 48 months incubation resulted in an increase in the weight of the samples (+19%) and a decrease in mechanical properties: tensile strength from 26.31 to 17.35 MPa and elongation at break from 304 to 31%. The biofilm formed on the polymer surface made it difficult for oxygen to reach the degraded material, so oxydegradation in the pond was slower. ATR-FTIR analysis and microscopic observations confirm the degradation taking place in natural environments. No visible degradation changes were observed in the oxo-biodegradable polyethylene after incubation under laboratory water, because of the lack of microorganisms and solar radiation. The degradation of oxo-biodegradable polyethylene in natural environments required a longer incubation time compared to the degradation time declared by the manufacturer.

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