Study of the soil burial degradation of some PLA/CS biocomposites

Vasile, Cornelia; Pamfil, Daniela; Râpă, Maria; Darie-Niță, Raluca Nicoleta; Miteluţ, Amalia Carmen; Popa, Elena Elisabeta; Popescu, Paul Alexandru; Drăghici, M.; Popa, Mona Elena

doi:10.1016/j.compositesb.2018.01.026

Cited by 102 publications

(48 citation statements)

References 48 publications

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“…PLA showed the negligible weight loss of ~1% at day-80. This result was in accordance with the previous studies that reported slow degradation of PLA in soil, attributed to the low hydrolysis rate at low temperature and water content, in addition, PLAdegrading microorganisms are not widely found in the natural environment which makes the PLA is less susceptible to microbial attack in a natural environment as compared to other aliphatic polyesters [13,14].…”

Section: Results and Discussion Soil Burial Testsupporting

confidence: 92%

Soil Burial, Hygrothermal and Morphology of Durian Skin Fiber Filled Polylactic Acid Biocomposites

2019

Adv. Environ. Biol

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In this work, the alkali (NaOH) treated and untreated durian skin fibers (DSF) were added into polylactic acid (PLA) to form biocomposites. The PLA/DSF biocomposite preparation was performed via melt blending method (180°C, 50 rpm and 10 mins retention time) at different loadings of DSF, i.e., 15, 25, 30 and 40 wt%, followed by compression molding to form thin sheet. The experimental investigation was carried out to study the weight loss of the PLA/DSF subjected to soil burial for 80 days and hygrothermal test for 14 days. Results showed that the incorporation of DSF can accelerate the weight loss of PLA, higher weight loss was observed at higher fiber content in both soil burial and hygrothermal test. Scanning electron microscope (SEM) micrographs showed the presence of crack line and voids, signs of degradation for soil buried sample.

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Section: Results and Discussion Soil Burial Testsupporting

confidence: 92%

Soil Burial, Hygrothermal and Morphology of Durian Skin Fiber Filled Polylactic Acid Biocomposites

2019

Adv. Environ. Biol

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“…The shorter chains resulted after degradation can easily reorganize in different crystallites type and this is evident by the two melting peaks in DSC curves and significant increase in crystallinity index X c from 11.05% to 32.76% and to 35.70% for PLA/14d/CG and PLA/14d/PC, respectively. A similar melting behavior of PLA was reported by Su et al [60] and also in our previous paper related to degradation of PLA systems by soil burial [30]. Biodegradation of PLA in the presence of Chaetomium globosum was also studied by Ding et al [61].…”

Section: Thermal Behaviorsupporting

confidence: 83%

“…The FTIR spectra of PLA, PLA/R, PLA/PEG and PLA/PEG/R before and after being inoculated with Chaetomium globosum and Phanerochaete chrysosporium fungi are shown in Figure 8a, The general band assignments for PLA-based samples was done according to literature data [25,54,55] and are presented in Table 4. As revealed in our previous studies [29,30,56], neat PLA exhibits sharp bands assigned to vibrations of carbonyl group, νC=O, with a maximum at 1749 cm −1 (stretching) and at 1266 cm −1 (bending). The absorption bands of native PLA are also noticed in the spectrum of the fungal-biodegraded PLA but slightly shifted to higher wavenumbers and with changes in intensities, and new bands also appears.…”

Section: Structural Changes-fourier-transform Infrared Spectroscopy (supporting

confidence: 61%

“…The natural bioactives as chitosan and rosemary ethanolic extract were selected to offer multifunctionality, as antimicrobial, antioxidant and biocompatibility to PLA materials, with potential applications both in food packaging and biomaterials, as it was demonstrated in our previous paper [29]. Their role was described in our previous papers [26,30]. Table 1.…”

Section: Methodsmentioning

confidence: 99%

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Influence of the Chitosan and Rosemary Extract on Fungal Biodegradation of Some Plasticized PLA-Based Materials

Stoleru

Vasile²,

Oprică

et al. 2020

Polymers

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The fungal degradation of the complex polymeric systems based on poly(lactic acid) (PLA) and natural bioactive compounds (chitosan and powdered rosemary alcoholic extract) was studied. Two fungal strains, Chaetomium globosum and Phanerochaete chrysosporium were tested. Both fungi characteristics and changes in morphology, structure and thermal properties were monitored. Biochemical parameters as superoxide dismutase, catalase, soluble protein and malondialdehyde have been determined at different time periods of fungal degradation. The fungi extracellular enzyme activities are slightly decreased in the case of composites containing bioactive compounds. The presence of natural compounds in the PLA-based polymeric system determines an acceleration of fungal degradation and probably the chemical hydrolysis, which further helps the attachment of fungi on the surface of polymeric samples. Significant decreases in average molecular mass of the polymeric samples were observed by fungi action; accompanied by structural changes, increase in crystallinity and decrease of thermal properties and the loss of the physical integrity and finally to degradation and integration of fungal degradation products into environmental medium. It was found that both fungi tested are efficient for PLA-based materials degradation, the most active from them being Chaetomium globosum fungus.

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“…Chitosan, especially in high amounts, increases the hydrophilicity of PLA composites, favoring moisture uptake and the attack of microorganisms in soil burial for 150 days. Tested sheets had small mass loss, but significant embrittlement and changes in mechanical, thermal, and surface properties were observed [65]. The usual temperature in the environment, soil or compost, is below the glass transition (Tg) of PLA (60 • C) [66,67].…”

Section: Biodegradability Of Polymer Composites With Natural Fillersmentioning

confidence: 99%

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

Brebu¹

2020

Polymers

133

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Polymer composites are widely used modern-day materials, specially designed to combine good mechanical properties and low density, resulting in a high tensile strength-to-weight ratio. However, materials for outdoor use suffer from the negative effects of environmental factors, loosing properties in various degrees. In particular, natural fillers (particulates or fibers) or components induce biodegradability in the otherwise bio inert matrix of usual commodity plastics. Here we present some aspects found in recent literature related to the effect of aggressive factors such as temperature, mechanical forces, solar radiation, humidity, and biological attack on the properties of plastic composites containing natural fillers.

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Study of the soil burial degradation of some PLA/CS biocomposites

Cited by 102 publications

References 48 publications

Soil Burial, Hygrothermal and Morphology of Durian Skin Fiber Filled Polylactic Acid Biocomposites

Soil Burial, Hygrothermal and Morphology of Durian Skin Fiber Filled Polylactic Acid Biocomposites

Influence of the Chitosan and Rosemary Extract on Fungal Biodegradation of Some Plasticized PLA-Based Materials

Environmental Degradation of Plastic Composites with Natural Fillers—A Review

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