scholarly journals On the Use of Phenolic Compounds Present in Citrus Fruits and Grapes as Natural Antioxidants for Thermo-Compressed Bio-Based High-Density Polyethylene Films

Antioxidants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 14
Author(s):  
Sandra Rojas-Lema ◽  
Sergio Torres-Giner ◽  
Luis Quiles-Carrillo ◽  
Jaume Gomez-Caturla ◽  
Daniel Garcia-Garcia ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
High Density Polyethylene ◽  
Food Packaging ◽  
Mechanical Performance ◽  
Natural Antioxidants ◽  
High Density ◽  
Hydroxyl Groups ◽  
Citrus Fruits ◽  
Oxidation Induction Time ◽  
Active Food Packaging

This study originally explores the use of naringin (NAR), gallic acid (GA), caffeic acid (CA), and quercetin (QUER) as natural antioxidants for bio-based high-density polyethylene (bio-HDPE). These phenolic compounds are present in various citrus fruits and grapes and can remain in their leaves, peels, pulp, and seeds as by-products or wastes after juice processing. Each natural additive was first melt-mixed at 0.8 parts per hundred resin (phr) of bio-HDPE by extrusion and the resultant pellets were shaped into films by thermo-compression. Although all the phenolic compounds colored the bio-HDPE films, their contact transparency was still preserved. The chemical analyses confirmed the successful inclusion of the phenolic compounds in bio-HDPE, though their interaction with the green polyolefin matrix was low. The mechanical performance of the bio-HDPE films was nearly unaffected by the natural compounds, presenting in all cases a ductile behavior. Interestingly, the phenolic compounds successfully increased the thermo-oxidative stability of bio-HDPE, yielding GA and QUER the highest performance. In particular, using these phenolic compounds, the onset oxidation temperature (OOT) value was improved by 43 and 41.5 °C, respectively. Similarly, the oxidation induction time (OIT) value, determined in isothermal conditions at 210 °C, increased from 4.5 min to approximately 109 and 138 min. Furthermore, the onset degradation temperature in air of bio-HDPE, measured for the 5% of mass loss (T5%), was improved by up to 21 °C after the addition of NAR. Moreover, the GA- and CA-containing bio-HDPE films showed a high antioxidant activity in alcoholic solution due to their favored release capacity, which opens up novel opportunities in active food packaging. The improved antioxidant performance of these phenolic compounds was ascribed to the multiple presence of hydroxyl groups and aromatic heterocyclic rings that provide these molecules with the features to permit the delocalization and the scavenging of free radicals. Therefore, the here-tested phenolic compounds, in particular QUER, can represent a sustainable and cost-effective alternative of synthetic antioxidants in polymer and biopolymer formulations, for which safety and environmental issues have been raised over time.

scholarly journals On the Use of Gallic Acid as a Potential Natural Antioxidant and Ultraviolet Light Stabilizer in Cast-Extruded Bio-Based High-Density Polyethylene Films

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 31 ◽  
Author(s):  
Luis Quiles-Carrillo ◽  
Sergi Montava-Jordà ◽  
Teodomiro Boronat ◽  
Chris Sammon ◽  
Rafael Balart ◽  
...  
Keyword(s):  
Gallic Acid ◽  
High Density Polyethylene ◽  
Food Packaging ◽  
Uv Light ◽  
High Density ◽  
Natural Antioxidant ◽  
Oxidation Induction Time ◽  
Sustainable Food ◽  
Light Stability ◽  
Twin Screw

This study originally explores the use of gallic acid (GA) as a natural additive in bio-based high-density polyethylene (bio-HDPE) formulations. Thus, bio-HDPE was first melt-compounded with two different loadings of GA, namely 0.3 and 0.8 parts per hundred resin (phr) of biopolymer, by twin-screw extrusion and thereafter shaped into films using a cast-roll machine. The resultant bio-HDPE films containing GA were characterized in terms of their mechanical, morphological, and thermal performance as well as ultraviolet (UV) light stability to evaluate their potential application in food packaging. The incorporation of 0.3 and 0.8 phr of GA reduced the mechanical ductility and crystallinity of bio-HDPE, but it positively contributed to delaying the onset oxidation temperature (OOT) by 36.5 °C and nearly 44 °C, respectively. Moreover, the oxidation induction time (OIT) of bio-HDPE, measured at 210 °C, was delayed for up to approximately 56 and 240 min, respectively. Furthermore, the UV light stability of the bio-HDPE films was remarkably improved, remaining stable for an exposure time of 10 h even at the lowest GA content. The addition of the natural antioxidant slightly induced a yellow color in the bio-HDPE films and it also reduced their transparency, although a high contact transparency level was maintained. This property can be desirable in some packaging materials for light protection, especially UV radiation, which causes lipid oxidation in food products. Therefore, GA can successfully improve the thermal resistance and UV light stability of green polyolefins and will potentially promote the use of natural additives for sustainable food packaging applications.

The Effect of Modifier on Properties of Bamboo Powder/High-Density Polyethylene Composites

2019 ◽  
Vol 69 (4) ◽  
pp. 313-321
Author(s):  
Xiaoxia Hu ◽  
Zhenghao Chen ◽  
Yang Cao ◽  
Zhangjing Chen ◽  
Shuangbao Zhang ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Dry Weight ◽  
Weight Percent ◽  
Sem Analysis ◽  
High Density ◽  
Hydroxyl Groups ◽  
Plastic Composites ◽  
Bamboo Powder ◽  
Plastic Matrix ◽  
Polyethylene Composites

Abstract The focus of this study was to observe the properties of bamboo plastic composites modified with a self-made modifier, 18 acyl-dopamine (0, 0.25, 0.50, 0.75, 1.00, and 1.25 weight percent [wt%] based on the dry weight of bamboo powder). The effects of the modifier were demonstrated by measures of mechanical properties, water absorption, thermal stability, and scanning electron microscopy (SEM). The results revealed that 18 acyl-dopamine could be used as an effective modifier of bamboo powder/high-density polyethylene composites. When the modifier was increased, the toughness of the composite deteriorated, and the strength and rigidity improved. This indicated that when the dosage became higher, the compatibilization became stronger, and the toughening effect became worse. Based on the experimental data, a small dosage modifier acted as a toughening agent; as the dosage increased to 1.0 wt%, the compatibility began to appear. The modifier reacted with the hydroxyl groups on the surface of the bamboo powder, which caused the bamboo powder to absorb less water, so the thickness expansion rate was lowest at 1.25 wt%. The pyrolysis peak of bamboo powder and plastic showed a tendency to be close to each other, indicating that the interface was improving. Based on the equation of Flynn-Wall-Ozawa, as the dosage of the modifier increased from 0.50 to 1.25 wt%, the apparent activation energy also increased. The SEM analysis showed the binding between bamboo powder and the plastic matrix was strongest when the modifier dosage was 1.25 wt%.

scholarly journals MECHANICAL CHARACTERIZATION OF PA 12 AND HDPE PIPES BEFORE AND AFTER AGING IN WATER AT TWO DIFFERENT TEMPERATURES

2021 ◽  
Vol 9 (1) ◽  
pp. 248-256
Author(s):  
J.A. dos Santos ◽  
R.C. Tucunduva ◽  
J.R.M. D’Almeida
Keyword(s):  
High Density Polyethylene ◽  
Mechanical Performance ◽  
High Density ◽  
Effect Of Temperature ◽  
Polyamide 12 ◽  
Polyethylene Pipes ◽  
Before And After ◽  
Different Temperatures ◽  
Deterioration Process ◽  
Combined Action

Polymer pipes are being widely used by many industrial segments. Although not affected by corrosion, the mechanical performance of these pipes can be reduced due to exposure to temperature, UV radiation and by contact with various fluids. Depending on the deterioration process, embrittlement or plasticization may occur, and the service life of the pipe can be severely reduced. In this work, the combined action of temperature and water upon the mechanical performance of polyamide 12 and high-density polyethylene pipes is evaluated. Destructive and non-destructive techniques were used and the performance of both materials was compared. Both polymers were platicized by the effect of water. However, for high density polyethylene the effect of temperature was more relevant than for polyamide. This behavior was attributed to the dependence of the free volume with the markedly different glass transition temperature of the polymers and the temperatures of testing.

scholarly journals Blend of cassava starch and high-density polyethylene with green tea for food packaging

2020 ◽  
Vol 11 (1-2) ◽  
pp. 3-14
Author(s):  
Cassiano MN Romagnolli ◽  
Gabriela P Leite ◽  
Tiago AR Rodrigues ◽  
Carolina L Morelli
Keyword(s):  
Green Tea ◽  
High Density Polyethylene ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Food Products ◽  
Tensile Tests ◽  
Thermoplastic Starch ◽  
Active Packaging ◽  
High Density ◽  
Service Lifetime

Plastic packagings are widely used for several food products. Considering the relatively short service lifetime of this application, it is important to perceive in the search of eco-friendly alternatives to this market, such as polymers from renewable sources, as thermoplastic starch and “green” polyethylene. The incorporation of an antibacterial agent to the packaging can extend food shelf life. Camellia sinensis is a plant with known antibacterial properties used in the preparation of “green tea.” In the present work, green tea was incorporated to a blend of cassava thermoplastic starch and high-density polyethylene (HDPE) by melt extrusion, aiming application as active packaging. Films were obtained by thermopressing and characterized through infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and tensile tests. Their antibacterial properties were evaluated against Staphylococcus aureus and Escherichia coli. The results indicated that the material developed has potential for food packaging applications. Moreover, the methodology applied for green tea incorporation in the Starch/HDPE films can be extended for many extracts from natural components, contributing to the advancement of research in the development of active packaging for food products. To the best of our knowledge, no previous work studied the properties of starch/HDPE blend with green tea.

Decay control and fungicide residues in citrus fruits seal-packed in a high-density polyethylene film

1981 ◽  
Vol 12 (5) ◽  
pp. 485-490 ◽  
Author(s):  
Shimshon Ben-Yehoshua ◽  
Akiva Apelbaum ◽  
Eliahou Cohen
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Polyethylene Film ◽  
Citrus Fruits ◽  
Fungicide Residues

Trends in the use of natural antioxidants in active food packaging: a review

2014 ◽  
Vol 31 (3) ◽  
pp. 374-395 ◽  
Author(s):  
Ana Sanches-Silva ◽  
Denise Costa ◽  
Tânia G. Albuquerque ◽  
Giovanna Giuliana Buonocore ◽  
Fernando Ramos ◽  
...  
Keyword(s):  
Food Packaging ◽  
Natural Antioxidants ◽  
Active Food Packaging

Characterization of Semi-Refined Carrageenan Reinforced with Cellulose Nanofiber Incorporated α-Tocopherol for Active Food Packaging Applications

2020 ◽  
Vol 1007 ◽  
pp. 154-159
Author(s):  
Wan Amnin Wan Yahaya ◽  
Raja Nurliyana Raja Ahmad ◽  
Nurul Aini Mohd Azman
Keyword(s):  
Food Packaging ◽  
Physical And Mechanical Properties ◽  
Natural Antioxidants ◽  
Cellulose Nanofiber ◽  
Food Protection ◽  
Active Film ◽  
Active Food Packaging ◽  
Uniform Dispersion ◽  
Matrix Interactions ◽  
New Formulation

This work focuses on the development of biodegradable active films packaging using natural compounds by reducing the plastic waste to environment but also as a potential substitute of synthetic preservative in food. Active film packaging was formulated using semi-refined carrageenan (SRC) biopolymer plasticized with glycerol (G), reinforced with different concentrations cellulose nanofiber (CNF) at 0 to 13% w/w incorporated 0.4% w/w α-tocopherol as natural antioxidants. Physical and mechanical properties of the film samples were analyzed. Active films reinforced CNF enhanced overall the tensile strength and the value of elongation at break significantly (p<0.05). Film samples reinforced with 10% w/w CNF improved the value of opacity, thickness, films solubility (%) and moisture content (%) with (5.60±0.14, 0.139 ±0.02, 27.89±2.41 and 18.88±1.06) respectively. In summary, an active film with 10% w/w CNF showed highest improvement on the mechanical and physical properties due to the uniform dispersion between CNF-SRC matrix interactions. Hence, the new formulation of active packaging film with showed competitive properties that could be an alternative solution for biodegradable films with function of food protection against oxidative degeneration.

High density polyethylene matrix composite as reinforcing agent in medium density fiberboards

2020 ◽  
Vol 54 (28) ◽  
pp. 4369-4385
Author(s):  
Ricardo Ritter de Souza Barnasky ◽  
Alexsandro Bayestorff da Cunha ◽  
Amanda Dantas de Oliveira ◽  
Martha Andreia Brand ◽  
Gabriela Escobar Hochmuller da Silva ◽  
...  
Keyword(s):  
Matrix Composite ◽  
High Density Polyethylene ◽  
Mechanical Performance ◽  
Urea Formaldehyde ◽  
High Density ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Polyethylene Matrix ◽  
Reinforcing Agent ◽  
Pinus Spp

This work provides a study about the incorporation of a high density polyethylene (HDPE) matrix composite in medium density fiberboards (MDF). A composite was processed in a single screw extruder with 5% of Pinus spp fibers in a HDPE matrix and applied as reinforcing agent in MDFs, as well as pure HDPE, in 11 different variations, using 12% of urea-formaldehyde resin and nominal density of 750 kg.m−3. The composite and the pure HDPE were analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The DSC results showed that both polymeric matrix and composite presented the same melting temperature but the composite had a reduced melting enthalpy and crystallinity due to thermal history. SEM analysis showed a well distribution of fibers on the composite. The results of technological properties of MDFs were compared to commercial MDF standards. The MDF reinforced with 40% of polymeric composite reached all minimum standard requirements, being the most recommended to be used as an alternative to conventional MDF, in terms of physical and mechanical performance.

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