Low-density polyethylene (LDPE) building films – Tensile properties and surface morphology

Szlachetka, Olga; Witkowska-Dobrev, Joanna; Baryła, Anna; Dohojda, Marek

doi:10.1016/j.jobe.2021.103386

Cited by 14 publications

(9 citation statements)

References 25 publications

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“…Another report, using vanillin as the antimicrobial agent rather than the cross-linker for chitosan, reported a tensile strength value of 31 MPa with a drying temperature of 40 °C . Conventional plastics used in food packaging such as polycaprolactone (PCL) and low-density polyethylene (LDPE) have tensile strength values in the region of 10–16 MPa, while polyethylene (PE) has a value of around 30 MPa. − A comparison of these values with our data suggests that our CVGP material has a superior tensile strength to that of some conventional plastics on the market. The EAB values reported are similar to those reported by Sangsuwan et al (4.05–4.4%). , These values, and hence the flexibility, may be improved by reducing the cross-linker content or altering the plasticizer content.…”

Section: Resultssupporting

confidence: 57%

Vanillin Cross-Linked Chitosan Film with Controlled Release of Green Tea Polyphenols for Active Food Packaging

Westlake,

Laabei,

Jiang

et al. 2023

ACS Food Sci. Technol.

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We report a novel cross-linked chitosan composite film containing vanillin, glycerol, and green tea extract. The effects of vanillin-mediated cross-linking and the incorporation of antimicrobial green tea polyphenols were investigated. The cross-linking effect, confirmed by Fourier transform infrared (FTIR) analysis, increased the tensile strength of the biopolymer film to 20.9 ± 3 MPa. The release kinetics of polyphenols from the chitosan–vanillin matrix was studied, and we reported an initial burst release (8 h) followed by controlled release (8 to 400 h). It was found that both vanillin and green tea polyphenols were successful inhibitors of foodborne bacteria, with a minimum inhibitory concentration of the tea polyphenols determined as 0.15 mg/mL (Staphylococcus aureus). These active components also displayed strong antioxidant capacities, with polyphenols quenching >80% of 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals at all concentrations tested. Degradation results revealed that there was a significant (>85%) mass loss of all samples after being buried in compost for 12 weeks. The biopolymeric films, prepared by solvent casting methods, adhere to green chemistry and waste valorization principles. The one-pot recipe reported may also be applied to other cross-linkers and active compounds with similar chemical functionalities. Based on the obtained results, the presented material provides a promising starting point for the development of a degradable active packaging material.

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Section: Resultssupporting

confidence: 57%

Vanillin Cross-Linked Chitosan Film with Controlled Release of Green Tea Polyphenols for Active Food Packaging

Westlake,

Laabei,

Jiang

et al. 2023

ACS Food Sci. Technol.

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“…Table 5 describes various physical parameters of the developed bioactive film. The thickness, tensile strength, and elongation of the developed packaging material resemble the low‐density polyethylene (LDPE) films (Szlachetka et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

Development of a bioactive film from fruit seed waste for shelf life extension of tomato (Solanum lycopersicum )

Kadirvel¹,

Raja²,

Mithulesh³

et al. 2022

Food Processing Preservation

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The global annual production of tomatoes is estimated to be 162 million tons every year. China is the world's largest producer of tomatoes with 50 million tons, followed by India with 17.5 million tons (Sarma, 2018). Tomatoes are consumed in the fresh state or as processed products, they are quite rich in nutrients such as carbohydrates, fiber, amino acids, organic acids, vitamins A, C, and E, minerals, and phenolics. It is epidemiologically proven that phenolics and their resultant antioxidants play a vital role in terms of reducing the risk of heart diseases and aiding in boosting the immune system (Ozturk & Ozer, 2019).According to the consumers, the unique flavor and aroma possessed by the commodity are the primary shelf life and quality indicating parameters (Beaulieu et al., 2004). These sensorial characteristics rely on balancing complex factors such as sugar content, volatile compounds, and organic acids (Gemma et al., 2011). Tomatoes are highly perishable commodities that encounter severe postharvest losses throughout the food supply chain's transportation, storage, and marketing stages, causing harm to both producers and consumers (Nasrin et al., 2009).The postharvest losses as a result of unfavorable weather conditions, disease and pests, damage during harvest, delay in harvest, damage during transportation, lack of market, and damage during

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“…The horizontal coordinate is parallel to the intersection edge of the plane tangent to the surface and the vertical coordinate is perpendicular to this plane. Based on the determined profiles, using equipment like in References 24 and 41, the linear roughness parameters of the samples were determined, which are summarized in Table 5.…”

Section: Resultsmentioning

confidence: 99%

Effect of sewage on compressive strength and geometric texture of the surface of concrete elements

Witkowska-Dobrev

Szlachetka

Malarski

et al. 2022

Structural Concrete

Self Cite

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This paper presents the results of a study on the compressive strength, weight loss, surface roughness, elemental analysis and ultrasonic pulse velocity (UPV) measurement after 270 days of seasoning concrete cubes measuring 100 Â 100 Â 100 mm in solutions of sewage from the post-grit chamber as well as sewage from the activated sludge chamber in three different environments, that is, acidic, neutral, and alkaline. The value of the compressive strength of the samples stored in the tested environments varied depending on the type of the tested wastewater and its pH in relation to the control sample. The most influence on compressive strength was acidic environment-the decrease was approximately 12.7% in the post-grit chamber and 9.5% in the activated sludge chamber. Samples which had been seasoned in the post-grid chamber were characterized by UPVs ranging from 4805.3 to 4864.6 m/s. Samples seasoned in an activated sludge chamber achieved UPVs ranging from 4689.7 to 4778.9 m/s. The average relative error between the compressive strength values calculated from the ultrasonic method according formula (3) and the measured values does not exceed 4%. The conclusions from the 3D measurements of roughnesses show that parameters Ra, Rz, Sa, and Sq are the most reliable in assessing the roughness intensity of corrosion damage of concrete caused by sewage. Elemental analysis proved that in the acidic pH solution of sewage from the post-grit chamber, the presence of calcium was not identified at any of the points tested.biological corrosion, concrete elements, environmental protection, roughness analysis, wastewater | INTRODUCTIONMunicipal sewage has a destructive impact on the concrete surface. Determining the aggressiveness of wastewater has an impact on the appropriate design of concrete structures in the water and wastewater management.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Low-density polyethylene (LDPE) building films – Tensile properties and surface morphology

Cited by 14 publications

References 25 publications

Vanillin Cross-Linked Chitosan Film with Controlled Release of Green Tea Polyphenols for Active Food Packaging

Vanillin Cross-Linked Chitosan Film with Controlled Release of Green Tea Polyphenols for Active Food Packaging

Development of a bioactive film from fruit seed waste for shelf life extension of tomato (Solanum lycopersicum )

Effect of sewage on compressive strength and geometric texture of the surface of concrete elements

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