Degradation of <scp>PLA</scp> and <scp>PLA</scp> in composites with triacetin and buriti fiber after 600 days in a simulated marine environment

Pelegrini, Kauê; Donazzolo, Indianara; Brambilla, V.; Grisa, Ana Maria Coulon; Piazza, Diego; Zattera, Ademir J.; Brandalise, Rosmary Nichele

doi:10.1002/app.43290

Cited by 43 publications

(30 citation statements)

References 43 publications

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“… 17 , 55 – 63 ] or closed-circuit tanks [e.g. 25 , 64 – 72 ] with a large variety of technical properties and environmental conditions. Currently, only one standard test exists [ 73 ] which describes the degradation of plastic materials in mesocosm tests; however it requires the supply of running seawater.…”

Section: Introductionmentioning

confidence: 99%

Field and mesocosm methods to test biodegradable plastic film under marine conditions

Lott¹,

Eich²,

Unger³

et al. 2020

PLoS ONE

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The pollution of the natural environment, especially the world's oceans, with conventional plastic is of major concern. Biodegradable plastics are an emerging market bringing along potential chances and risks. The fate of these materials in the environment and their possible effects on organisms and ecosystems has rarely been studied systematically and is not well understood. For the marine environment, reliable field test methods and standards for assessing and certifying biodegradation to bridge laboratory respirometric data are lacking. In this work we present newly developed field tests to assess the performance of (biodegradable) plastics under natural marine conditions. These methods were successfully applied and validated in three coastal habitats (eulittoral, benthic and pelagic) and two climate zones (Mediterranean Sea and tropical Southeast Asia). Additionally, a stand-alone mesocosm test system which integrated all three habitats in one technical system at 400-L scale independent from running seawater is presented as a methodological bridge. Films of polyhydroxyalkanoate copolymer (PHA) and low density polyethylene (LD-PE) were used to validate the tests. While LD-PE remained intact, PHA disintegrated to a varying degree depending on the habitat and the climate zone. Together with the existing laboratory standard test methods, the field and mesocosm test systems presented in this work provide a 3tier testing scheme for the reliable assessment of the biodegradation of (biodegradable) plastic in the marine environment. This toolset of tests can be adapted to other aquatic ecosystems.

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Section: Introductionmentioning

confidence: 99%

Field and mesocosm methods to test biodegradable plastic film under marine conditions

Lott¹,

Eich²,

Unger³

et al. 2020

PLoS ONE

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“…Pelegrini et al investigated the degradation behaviour of poly(lactic acid) (PLA) composites in a simulated marine environment. The results showed that the colonisation of microorganisms (diatoms) has a strong influence on the degradation of PLA composites [68].…”

Section: Biodegradation Under Marine Conditionsmentioning

confidence: 99%

Biodegradation of Poly (Butylene Succinate) (PBS)/Stearate Modified Magnesium-Aluminium Layered Double Hydroxide Composites under Marine Conditions Prepared via Melt Compounding

et al. 2020

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In the present work, polybutylene succinate (PBS)/stearate modified magnesium-aluminium layered double hydroxide (St-Mg-Al LDH) composites were prepared via melt processing and the effect of different loadings of St-Mg-Al LDH on the degradation behaviour of PBS under marine conditions was investigated. The morphological, mechanical and thermal characteristics of the composites were studied using different characterisation techniques. Optical imaging and scanning electron microscopy revealed that the incorporation of St-Mg-Al LDH accelerates the degradation of PBS along with the activity of microorganisms adhered to the composite films. PBS/St-Mg-Al LDH composites are found to have lower thermal degradation temperatures than those of pure PBS. The decrease in thermal stability is correlated with the degradation of PBS due to the catalytic action Mg and Al present in LDH. Tensile and DMA analysis revealed that the addition of St-Mg-Al LDH did not have a significant impact on the mechanical properties of PBS.

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“…These consist mainly of acidic polysaccharides that can be carboxylated and / or sulfated in different levels. Diatoms present in marine environments colonize the surfaces of the polymers existing in that environment, especially where there are rough surfaces (Carson et al, 2013;Pelegrini et al, 2016). Wahl (1989) carried out studies in the area, where it was evidenced that, in general, bacterial colonization precedes and facilitates colonization by diatoms.…”

Section: Field Emission Scanning Electron Microscopy (Fesem)mentioning

confidence: 99%

Evaluation of polypropylene degradation with commercial additives in different media of exposure

Pires

Ramos

Miranda

et al. 2020

REGET

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Polypropylene (PP) is one of the most widely used polymers in the world, mainly due to its versatility, good properties, and low cost. However, since it is not easily degraded in the natural environment, several research projects have been developed to increase its biodegradability. The use of pro-degrading additives has been explored, as they promote the process of polymer degradation. Nevertheless, few studies have evaluated the degradation of these materials in natural aqueous environments such as rivers and lakes, which contain large amounts of PP waste. The goal of this study was to evaluate the degradation of polypropylene, as well as the biodegradation of PP through the incorporation of two additives of different natures, organic and enzymatic. For this purpose, PP blends were produced with 4% additive, which has the purpose of conferring biodegradability to the material, since polypropylene has high resistance to degradation. In order to verify the behavior of the materials against degradation tests with 2 different media (saline and fresh water) for a period of 6 months, the samples were characterized by Fourier Transformed Infrared Spectroscopy and Field emission scanning electron microscopy. The characterizations were carried out in order to verify the changes in the structural characteristics and in the morphology of the materials caused by the incorporation of the additive and by the exposure to the degradation media. From the results obtained, it was observed that the additives influenced the degradation of PP. In addition, the enzyme additive and the saline media caused more significant changes in the properties analyzed, indicating greater influence on the degradation process. It was concluded that the incorporation of commercial additives gives biodegradable properties to PP. Therefore, this study has an important role in the research and development of biodegradable materials in order to minimize the effects caused by plastic waste in the environment. Thus, the studied materials are an alternative in the field of plastic packaging, reducing the effects caused by plastic waste in the environment.

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Degradation of PLA and PLA in composites with triacetin and buriti fiber after 600 days in a simulated marine environment

Cited by 43 publications

References 43 publications

Field and mesocosm methods to test biodegradable plastic film under marine conditions

Field and mesocosm methods to test biodegradable plastic film under marine conditions

Biodegradation of Poly (Butylene Succinate) (PBS)/Stearate Modified Magnesium-Aluminium Layered Double Hydroxide Composites under Marine Conditions Prepared via Melt Compounding

Evaluation of polypropylene degradation with commercial additives in different media of exposure

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