Abiotic aging assisted bio-oxidation and degradation of LLDPE/LDPE packaging polyethylene film by stimulated enrichment culture

Jaiswal, Pooja B.; Pushkar, Bhupendra; Maikap, Kamalakanta; Mahanwar, Prakash A.

doi:10.1016/j.polymdegradstab.2022.110156

Cited by 12 publications

(5 citation statements)

References 81 publications

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“…The changes observed only in two spectra of T-LDPE indicate that the change in -OH is related to the heat treatment. This is consistent with the variation in LDPE/LLDPE studied by Jaiswal et al [ 60 ]. Most specifically, after the biodegradation of T-LDPE by CPEF-6, a distinct peak from 2395 to 2281 cm −1 appeared, indicating an increase in the weak stretching of the C≡C bond and an increase in the strong stretching of the O=C=O bond [ 61 ].…”

Section: Discussionsupporting

confidence: 93%

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Gong

Jin

et al. 2023

JoF

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Low density polyethylene (LDPE) has been widely used commercially for decades; however, as a non-degradable material, its continuous accumulation has contributed to serious environmental issues. A fungal strain, Cladosporium sp. CPEF-6 exhibiting a significant growth advantage on MSM-LDPE (minimal salt medium), was isolated and selected for biodegradation analysis. LDPE biodegradation was analyzed by weight loss percent, change in pH during fungal growth, environmental scanning electron microscopy (ESEM), and Fourier transformed infrared spectroscopy (FTIR). Inoculation with the strain Cladosporium sp. CPEF-6 resulted in a 0.30 ± 0.06% decrease in the weight of untreated LDPE (U-LDPE). After heat treatment (T-LDPE), the weight loss of LDPE increased significantly and reached 0.43 ± 0.01% after 30 days of culture. The pH of the medium was measured during LDPE degradation to assess the environmental changes caused by enzymes and organic acids secreted by the fungus. The fungal degradation of LDPE sheets was characterized by ESEM analysis of topographical alterations, such as cracks, pits, voids, and roughness. FTIR analysis of U-LDPE and T-LDPE revealed the appearance of novel functional groups associated with hydrocarbon biodegradation as well as changes in the polymer carbon chain, confirming the depolymerization of LDPE. This is the first report demonstrating the capacity of Cladosporium sp. to degrade LDPE, with the expectation that this finding can be used to ameliorate the negative impact of plastics on the environment.

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Section: Discussionsupporting

confidence: 93%

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Gong

Jin

et al. 2023

JoF

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“…Meanwhile, the band of 1620~1660 cm −1 can be considered as the stretching vibration of the amide II and CN groups of nylon-6, and the one over 1520~1560 cm −1 can be due to the vibrations of amide I, almost identical to those reported in the literature [34]. Furthermore, the bands around 1450~1470 and 1380~1360 cm −1 are respectively attributed to the bending vibrations of the −CH2 and −CH3 groups while the band around 710~730 cm −1 is probably due to the rocking vibration of the −CH2 group [35,36]. The above information tends to suggest there may be no strong interaction between nylon-6 and PE, even though they are co-present in the waste sample.…”

Section: Ftir Examinationsupporting

confidence: 84%

Kinetic and Thermodynamic Analyses of Co-Pyrolysis of Nylon-Polyethylene Pouch Wastes

Wan,

Huang

2023

Materials

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In this study, thermogravimetric measurements of nylon-6/polyethylene double-layer pouch wastes were conducted in N2 under a constant heating-rate mode, and the multiple heating-rate results were analyzed in terms of degradation features and specific temperatures. Experimental results show that the waste pyrolysis involves one reaction stage, and all specific parameters appear to increase with the heating rate. Kinetic analysis of non-isothermal data was thoroughly performed using various isoconversional model-free methods for the calculations of the activation energy, resulting in 143~215 kJ/mol over the whole pyrolysis process. By means of the model-fitting method, the reaction mechanism model g(α) and pre-exponential factor lnk0 are concurrently determined with the aid of the linear compensation effect. With such methodology proposed, the Avrami–Erofeev kinetic model A3/2 of g(α) = [−ln(1 − α)]2/3 is found to be the most appropriate mechanism function for describing the pyrolysis of the nylon-6/polyethylene waste along with lnk0 of 23.14 to 34.26 min−1. With the Arrhenius parameters thus obtained, the predictions were made and performed very satisfactorily to correlate experimental results. Additionally, the service life and thermodynamic parameters over the entire pyrolysis process were also estimated.

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“…Polyethylene (PE) is a highly versatile thermoplastic polymer finding extensive use across a broad range of applications in packaging films, insulation, bottles, storage tanks, plastic containers, etc. High density polyethylene (HDPE) and low density polyethylene (LDPE) are two of the most produced PE grades due to their wide availability in pellet and powder forms, making them ideal for film applications and rotational molding 1–5 . However, the relatively low mechanical properties (rigidity and strength), limited temperature of operation, and sensitivity to environmental stress cracking are disadvantages for more demanding applications.…”

Section: Introductionmentioning

confidence: 99%

“…High density polyethylene (HDPE) and low density polyethylene (LDPE) are two of the most produced PE grades due to their wide availability in pellet and powder forms, making them ideal for film applications and rotational molding. [1][2][3][4][5] However, the relatively low mechanical properties (rigidity and strength), limited temperature of operation, and sensitivity to environmental stress cracking are disadvantages for more demanding applications. Although several additives and reinforcements have been proposed to address these issues, [6][7][8][9] the problem of low thermal stability remains.…”

Section: Introductionmentioning

confidence: 99%

The effect of chemical crosslinking on the properties of Rotomolded high density polyethylene

Ahmad,

Rostami‐Tapeh‐Esmaeil,

Rodrigue

2023

J of Applied Polymer Sci

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In this study, high density polyethylene (HDPE) was combined with dicumyl peroxide (DCP) to produce crosslinked parts via rotational molding. The effect of DCP content (0.1–2.5 phr) on the crosslinking degree was investigated to determine its effect on the chemical, mechanical, physical, and thermal properties of HDPE. The gel content and crosslink density was found to increase with DCP content. These trends led to a reduction in the degree of crystallinity, melting, and crystallization temperature. Thermogravimetric analysis (TGA) showed that crosslinked HDPE (xHDPE) has higher thermal stability than the neat matrix in both air and nitrogen atmosphere. In addition, a direct relationship was observed between improved thermal resistance and higher impact strength. Finally, relationships between the tensile properties of xHDPE and the degree of crystallinity were observed, which were all controlled by the level of crosslinking. These results have the potential to advance the manufacturing of high performance materials suitable for a wide range of applications such as automotive parts, agricultural products, chemical storage tanks, large waste containers, and fuel tanks in general.

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Abiotic aging assisted bio-oxidation and degradation of LLDPE/LDPE packaging polyethylene film by stimulated enrichment culture

Cited by 12 publications

References 81 publications

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Biodegradation of Low Density Polyethylene by the Fungus Cladosporium sp. Recovered from a Landfill Site

Kinetic and Thermodynamic Analyses of Co-Pyrolysis of Nylon-Polyethylene Pouch Wastes

The effect of chemical crosslinking on the properties of Rotomolded high density polyethylene

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