Accelerated weathering study of extruded polyethylene/poly (lactic acid)/chitosan films

Lizárraga-Laborín, Lauren Lucero; Quiroz-Castillo, Jesus Manuel; Encinas, José Carmelo; Castillo‐Ortega, M. M.; Burruel-Ibarra, S. E.; Romero‐García, Jorge; Torres-Ochoa, J.A.; Cabrera-Germán, D.; Rodríguez-Félix, Dora Evelia

doi:10.1016/j.polymdegradstab.2018.06.007

Cited by 30 publications

(18 citation statements)

References 23 publications

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“…SEM micrographs and color change of the materials before (PLA, 30AF, 40AF, 30CF, and 40CF) and after weathering (PLAW, 30AFW, 40AFW, 30CFW, and 40CFW).Note: SEM: scanning electron microscopy; PLA: polylactic acid carboxyl groups, causing an increased carbonyl index (CI). 32,33 The increments of CI by weathering in agave biocomposites were lower than for neat PLA (around 14% for both 30AF and 40AF) since the fibers attenuated the degradation by UV radiation. Higher CI increments (25 and 23% for 30CF and 40CF) occurred for coir biocomposites; this is associated with UV radiation absorbed by the lignin, which produced free radicals that interact with carbonyl groups of PLA.…”

Section: Carbonyl Indexmentioning

confidence: 96%

Influence of agro-industrial wastes over the abiotic and composting degradation of polylactic acid biocomposites

Campo

Robledo‐Ortíz

Arellano

et al. 2021

Journal of Composite Materials

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Combining polylactic acid (PLA) with waste fibers to produce reinforced biocomposites is of top interest to replace conventional polymers for environmentally friendlier materials. Natural fibers have a remarkable effect on the mechanical and thermal properties of the biocomposites. This reinforcing effect strongly depends on the chemical compositions of fibers, which will also influence the susceptibility of the biocomposites to abiotic and biotic degradation processes. This study evaluated the effect of agave and coir waste fibers over the abiotic and composting degradation of PLA-based biocomposites. Compression-molded PLA/agave and PLA/coir biocomposites using GMA-g-PLA as compatibilizer were subjected to accelerated weathering. Weathered and unweathered samples were further submitted to water absorption to analyze their hydrolytic degradation and composting for biotic degradation. Both fibers showed significant influence on biocomposites degradation. The role of the fibers in UV and hydrolytic degradation was positive for impact properties since the biocomposites were less affected than PLA. Water uptake was increased with fiber addition, while hydrolytic degradation was decreased. The weathering (abiotic degradation) accelerated the PLA biodegradation rate. In general, the results showed that adding both fibers to PLA could help its outdoor performance, maintaining the biodegradable characteristics of these materials.

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Section: Carbonyl Indexmentioning

confidence: 96%

Influence of agro-industrial wastes over the abiotic and composting degradation of polylactic acid biocomposites

Campo

Robledo‐Ortíz

Arellano

et al. 2021

Journal of Composite Materials

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“…In the spectra associated to the IT and SP packages, the characteristic peaks of polyethylene were well‐defined corresponding to the ─CH─ asymmetric and symmetric stretching vibrations around 3000 to 2800 cm −1 , CH 2 scissoring vibrations around 1463 cm −1 and CH 2 rocking band at 725 cm −1. In addition to the specific bands for polyethylene, characteristic bands for PA6 can be observed on the FTIR spectra assigned to the RO and SLO packages. The band at 3300 cm −1 matched with NH─ stretching vibration, and the bands at 2935 and 2860 cm −1 belong to CH 2 antisymmetric and symmetric stretching vibrations, whilst the band at 1635 cm −1 corresponds to C═O stretching vibration.…”

Section: Resultsmentioning

confidence: 99%

Impact of packaging properties on the physical‐chemical‐microbiological‐sensory characteristics of Ricotta cheese during storage

et al. 2019

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Ricotta is a highly perishable cheese of which shelf‐life is strongly influenced by the properties of packages in which it is stored. Four plastic packages currently in use in Italy (IT), Romania (RO), Slovenia (SLO), and Spain (SP) are characterized in term of structure, barrier, and antimicrobial properties, and their efficiency in the ricotta storage at 4°C is assessed. Differential scanning calorimetry and Fourier‐transform infrared spectroscopy analysis indicate that the IT and SP packages are made of low‐density polyethylene and the RO and SLO packages consist of polyethylene and polyamide 6. Permeability to the water vapour and oxygen transmission rate vary as follows: IT>SLO > RO > SP and SP > IT>RO > SLO, respectively. The SP package expressed the highest antimicrobial inhibition whilst the IT package the lowest. The maximum amounts of volatile compounds in cheese were reached after 3 days in the IT and SP packages and after 6 days in the SLO and RO packages. The score 2.8 for cheese overall acceptability was exceeded after 7 days in the IT, RO, and SP packages and 6 days in the SLO package. Barrier properties of packages significantly influence the shelf‐life of ricotta. Low barrier properties resulted in high level of oxygen and water vapours inside the headspace of packages ultimately favour the microbial development. The simultaneous compliance of microbiological safety level and overall acceptability score gives ricotta a shelf‐life of 3 days in the IT, RO, and SP packages and 1 day in the SLO package.

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“…As shown in Figure 13a, the stretching vibration peak of C=O groups becomes stronger with the increasing aging cycles, which corresponds to the UV radiation products of the aging process, leading to a reduction in the light transmittance of the hydrogel [27]. The -CH2 stretching vibration peak at 2920 cm −1 becomes weaker as the aging cycle increases, corresponding to the degradation process of the polymer chain.…”

Section: Anti-aging Analysismentioning

confidence: 94%

Effect of Poly(acrylamide-acrylic acid) on the Fire Resistance and Anti-Aging Properties of Transparent Flame-Retardant Hydrogel Applied in Fireproof Glass

2021

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Poly(acrylamide-acrylic acid) (P(AM-co-AA)) was synthesized via the copolymerization of acrylamide and acrylic acid and well characterized by Fourier transform infrared spectroscopy. Afterward, the obtained P(AM-co-AA) was blended with flame retardants to prepare transparent flame-retardant hydrogel applied in the fireproof glass. The influence of poly(acrylamide-acrylic acid) on fire resistance and anti-aging properties of the transparent flame-retardant hydrogels were studied by assorted analysis methods. The optical transparency analysis shows that the light transmittance of the transparent flame-retardant hydrogel gradually decreases with the decreasing mass ratio of acrylamide to acrylic acid in P(AM-co-AA). Heat insulation testing shows that the heat insulation performance of fireproof glass applying the transparent flame-retardant hydrogel firstly decreases and then increases with decreasing mass ratio of acrylamide to acrylic acid in P(AM-co-AA). When the mass ratio of acrylamide to acrylic acid is 1:2, the obtained P(AM-co-AA) endows the resulting flame-retardant hydrogel applied in fireproof glass with the lowest light transmittance of 81.3% and lowest backside temperature of 131.4 °C at 60 min among the samples, which is attributed to the formation of a more dense and expanded char to prevent the heat transfer during combustion, as supported by the digital photos of char residues. The results of TG analysis indicate that P(AM-co-AA) imparts high thermal stability to the resulting hydrogels due to the hydrogen bonds between carboxyl and amide groups. The accelerated aging test shows that the transparent flame-retardant hydrogel containing P(AM-co-AA) is less affected by aging conditions. Especially, when the mass ratio of acrylamide to acrylic acid in P(AM-co-AA) is 4:1, the resulting transparent flame-retardant hydrogel shows a light transmittance of 82.9% and backside temperature of 173.1 °C at 60 min after 7 aging cycles, exhibiting the best comprehensive properties among the samples.

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Accelerated weathering study of extruded polyethylene/poly (lactic acid)/chitosan films

Cited by 30 publications

References 23 publications

Influence of agro-industrial wastes over the abiotic and composting degradation of polylactic acid biocomposites

Influence of agro-industrial wastes over the abiotic and composting degradation of polylactic acid biocomposites

Impact of packaging properties on the physical‐chemical‐microbiological‐sensory characteristics of Ricotta cheese during storage

Effect of Poly(acrylamide-acrylic acid) on the Fire Resistance and Anti-Aging Properties of Transparent Flame-Retardant Hydrogel Applied in Fireproof Glass

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