scholarly journals Influence of a Natural Plant Antioxidant on the Ageing Process of Ethylene-norbornene Copolymer (Topas)

2021 ◽  
Vol 22 (8) ◽  
pp. 4018
Author(s):  
Anna Masek ◽  
Angelika Plota
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Colour Change ◽  
Good Alternative ◽  
Plant Origin ◽  
Aging Behavior ◽  
Current State ◽  
Ft Ir ◽  
Potential Use

In the field of polymer technology, a variety of mainly synthetic additives are used to stabilize the materials during processing. However, natural compounds of plant origin can be a green alternative to chemicals such as synthetic polyphenols. An analysis of the effect of hesperidin on the aging behavior of ethylene-norbornene copolymer was performed. The evaluation of changes in the tested samples was possible by applying the following tests: determination of the surface energy and OIT values, mechanical properties analysis, colour change measurements, FT-IR and TGA analyses. The obtained results proved that hesperidin can be effectively used as natural stabilizer for polymers. Furthermore, as a result of this compound addition to Topas-silica composites, their surface and physico-mechanical properties have been improved and the resistance to aging significantly increased. Additionally, hesperidin can act as a dye or colour indicator and only few scientific reports describe a possibility of using flavonoids to detect changes in products during their service life, e.g., in food packaging. In the available literature, there is no information about the potential use of hesperidin as a stabilizer for cycloolefin copolymers. Therefore, this approach may contribute not only to the current state of knowledge, but also presents an eco-friendly solution that can be a good alternative to synthetic stabilizers.

scholarly journals Determination of the Tensile Properties and Biodegradability of Cornstarch-Based Biopolymers Plasticized with Sorbitol and Glycerol

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3709
Author(s):  
M. M. Harussani ◽  
S. M. Sapuan ◽  
A. H. M. Firdaus ◽  
Yaser A. El-Badry ◽  
Enas E. Hussein ◽  
...  
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Food Packaging ◽  
Young's Modulus ◽  
Casting Process ◽  
Biodegradable Materials ◽  
And Performance

In this study, the effects of various quantities of sorbitol and glycerol plasticizers (0%, 30%, 45%, and 60%) on cornstarch-based film were examined to develop a novel polymer for usage with biodegradable materials. The film was prepared using the casting process. According to the test findings, the application of the plasticizer concentrations affected the thickness, moisture content, and water absorption of the film. When plasticizer concentrations were increased to 60%, the tensile stress and Young’s modulus of plasticized films dropped regardless of plasticizer type. However, the thin film with addition of 30% sorbitol plasticizer demonstrated a steady value of Young’s modulus (60.17 MPa) with an increase in tensile strength (13.61 MPa) of 46%, while the lowest combination of tensile strength and Young’s modulus is the film that was plasticized with 60% glycerol, with 2.33 MPa and 16.23 MPa, respectively. In summary, the properties and performance of cornstarch-based film were greatly influenced by plasticizer types and concentrations. The finest set of features in this research appeared in the film plasticized with 30% sorbitol, which achieved the best mechanical properties for food packaging applications.

scholarly journals Tannin-Based Hybrid Materials and Their Applications: A Review

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4910
Author(s):  
Ann-Kathrin Koopmann ◽  
Christian Schuster ◽  
Jorge Torres-Rodríguez ◽  
Stefan Kain ◽  
Heidi Pertl-Obermeyer ◽  
...  
Keyword(s):  
Food Packaging ◽  
Building Blocks ◽  
High Reactivity ◽  
Comprehensive Overview ◽  
Chemical Mechanisms ◽  
Organic Species ◽  
Current State ◽  
State Of Research ◽  
In Virtue Of ◽  
Potential Use

Tannins are eco-friendly, bio-sourced, natural, and highly reactive polyphenols. In the past decades, the understanding of their versatile properties has grown substantially alongside a continuously broadening of the tannins’ application scope. In particular, recently, tannins have been increasingly investigated for their interaction with other species in order to obtain tannin-based hybrid systems that feature advanced and/or novel properties. Furthermore, in virtue of the tannins’ chemistry and their high reactivity, they either physicochemically or physically interact with a wide variety of different compounds, including metals and ceramics, as well as a number of organic species. Such hybrid or hybrid-like systems allow the preparation of various advanced nanomaterials, featuring improved performances compared to the current ones. Consequently, these diverse-shaped materials have potential use in wastewater treatment or catalysis, as well as in some novel fields such as UV-shielding, functional food packaging, and biomedicine. Since these kinds of tannin-based hybrids represent an emerging field, thus far no comprehensive overview concerning their potential as functional chemical building blocks is available. Hence, this review aims to provide a structured summary of the current state of research regarding tannin-based hybrids, detailed findings on the chemical mechanisms as well as their fields of application.

scholarly journals Determination of oxygen permeability and mechanical properties of the aluminium paper foils

2014 ◽  
Vol 60 (No. 4) ◽  
pp. 172-179 ◽  
Author(s):  
Ľ. Kubík ◽  
S. Zeman
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Food Packaging ◽  
Oxygen Permeability ◽  
Pure Oxygen ◽  
Aluminium Layer ◽  
Tensile Forces ◽  
Moduli Of Elasticity

The paper deals with the determination of the oxygen permeability and mechanical properties of butter and curd aluminium paper foils Radaflex applied in the food packaging. Foil Radaflex is a paper foil covered by the aluminium layer. The measurement of the oxygen permeability was realized according to the Standard STN EN 77 0333. The measurement of mechanical properties was realized according to the Standard STN EN ISO 1924-2. Determination of moduli of elasticity in the longitudinal and transversal direction were provided and tensile properties as maximal elongations, maximal tensile forces, tensile strengths, tensile indexes and strain at breaks of the longitudinal and transversal specimens were evaluated. The permeability of pure oxygen through aluminium paper foils was studied. Aluminium paper foil was not permeable for the oxygen.

scholarly journals Physico-chemical and mechanical thermo-rheological characterization of three varieties of triticale starches

2020 ◽  
Vol 32 ◽  
pp. 1-5
Author(s):  
Zormy Nacary Correa-Pacheco ◽  
P.A. González-Fuentes ◽  
C.L. Tramón-Pregnan ◽  
S.C. Solorzano-Ojeda ◽  
A. Zúñiga-Quintana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Grain Morphology ◽  
Thermoplastic Starch ◽  
Good Alternative ◽  
Human Consumption ◽  
Rheological Characterization ◽  
Initial Water ◽  
Glycerol Water ◽  
Physico Chemical

Nowadays, starch is an excellent biodegradable option instead of synthetic polymers, to avoid contamination. In this work, triticale starch from three varieties (Faraón, Peteroa and Aguacero) was isolated and the physico-chemical and thermo-rheological properties were evaluated. Also, mechanical properties of thermoplastic films using this starch were assessed. From the physico-chemical analysis it was found that the moisture, protein and lipids contents were slightly different among starches. Amylose value was similar. Thermo-rheological behavior measured by Mixolab® revealed that initial water uptake was higher for Faraón variety due to the grain morphology observed by Scanning Electron Microscopy (SEM). Values for gelatinization temperature obtained were 82.2 °C for Faraón starch, followed by Peteroa (72.0 °C) and finally Aguacero (65.6 °C). From the mechanical properties, Faraón thermoplastic starch (TPS) films showed the highest value of Young’s modulus (1.90 ± 1.09 MPa) for the composition 50/25/25  (starch/glycerol/water). The highest elongation at break (64.77 ± 14.14 %) was obtained for Peteroa composition 50/35/15 (starch/glycerol/water).  Then, triticale mainly used to feed animals more than for human consumption, could be good alternative for preparing biodegradable films with potential applications in agriculture and food packaging.

Compounding and Melt Strengthening of Poly(Lactic Acid): Shear and Elongation Rheological Investigations for Forming Process

2013 ◽  
Vol 554-557 ◽  
pp. 1751-1756 ◽  
Author(s):  
Benoit Mallet ◽  
Khalid Lamnawar ◽  
Abderrahim Maazouz
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Supercritical Co2 ◽  
Food Packaging ◽  
Blow Up ◽  
Good Alternative ◽  
Chain Extension ◽  
Poly Lactic Acid ◽  
Forming Process ◽  
Batch Foaming

The poly (lactic acid) (PLA), through its organic origin and its biodegradation properties, can be a good alternative to petroleum-based polymers. To this end, the forming process as well blown extrusion and foaming of PLA was investigated in this study as an alternative for the production of food packaging. Through this work, we present some promising routes to enhance its processing ability which presents several challenges mainly due to the poor shear and elongation properties of this biopolymer. To our knowledge, there is no paper dedicated to the investigation of foaming and/or blown extrusion of PLA that involves structural, rheological and thermo-mechanical properties. To achieve this objective, various formulations of PLA with multifunctionalized epoxy, nucleants and plasticizer were prepared and characterized on the basis of their linear viscoelasticity and extensional properties. The balance of chain extension and branching has been also investigated using solution viscosimetry, Steric exclusion chromatography (SEC) and rheology (relaxation spectrum, Van Gurp Palmen curves….). We pushed further by characterizing both the structure and thermo-mechanical properties of PLA formulations. On one hand, a batch foaming assisted with supercritical CO2 was achieved following a full characterization in physicochemical, rheological and thermal domain, The influence of the foaming parameters, the extent of chain modification as well as the contribution of crystallization on cell morphology was evaluated. Based on these parameters, structures ranging from micro to macro-cellular-cell were obtained. On the other hand, the stability maps of blown processing for neat and modified PLA were established at different die temperatures. We have achieved a great enhancement of the blown processing windows of PLA with high BUR (Blow Up Ratio) and TUR (Take Up Ratio) attained. We were able to demonstrate that a higher kinetic of crystallization can also be reached for chain-extended and branched PLA formulated with adequate amounts of nucleants and plasticizers. Induced crystallization during process was also demonstrated. Through this work, blown films with interesting thermo-mechanical and mechanical properties have been produced using an optimal formulation for PLA. References [1] A. Maazouz, K. Lamnawar, B. Mallet, Patent: C08L67/00; C08J5/10. FR2941702 (A1). (2010) [2] Y.-M. Corre, A. Maazouz, J. Duchet, J. Reignier, Batch foaming of chain extended PLA with supercritical CO2: Influence of the rheological properties and the process parameters on the cellular structure. J. of Supercritical Fluids,58 (2011) 177-188 [3] B. Mallet, K. Lamnawar, A. Maazouz, Compounding and processing of biodegradable materials based on PLA for packaging applications: In greening the 21st century material’s world, Frontiers in Science and Engineering, 1-2(2011) 1-44 [4] B. Mallet, K. Lamnawar, A. Maazouz, Improvement of blown extrusion processing of PLA: structure-processing-properties relashionships. Polymer engineering and Science (To appear in 2013).

scholarly journals The effect of plasticizers and chitosan concentration on the structure and properties of Gracilaria sp.-based thin films for food packaging purpose

Polimery ◽  
2021 ◽  
Vol 66 (2) ◽  
Author(s):  
M. Zulham Efendi Sinaga ◽  
Saharman Gea ◽  
Cut Fatimah Zuhra ◽  
Yuan Alfinsyah Sihombing ◽  
Emma Zaidar ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Mechanical Properties ◽  
Food Packaging ◽  
Antimicrobial Properties ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Chitosan Concentration ◽  
Active Food Packaging ◽  
Ft Ir

Gracilaria sp. is well known as one kind of species of red algae. The major component of polysaccharide in this alga is agar that mostly used for making thin film. In this study, the Gracilaria sp.-based thin film had been prepared using two plasticizers (glycerol and sorbitol, 0.1, 0.2, and 0.3 wt %), and chitosan (1, 2, and 3 wt %). The FT-IR analysis confirmed the interaction that happened among the component of the mixture of Gracilaria sp., plasticizers, and chitosan was based on hydrogen bonding due to the presence of -OH and -NH2 groups. The plasticizers and chitosan concentration have significant role to the mechanical properties of Gracilaria sp.-based thin film. The optimum concentration of plasticizers and chitosan based on mechanical testing result was found at 0.2 and 3.0 wt %, respectively. At those concentrations, the thin film that prepared with sorbitol showed the highest mechanical properties. Other characterizations, i.e. TGA (Thermogravimetric Analysis), SEM (Scanning Electron Microscopy), and WVP (Water Vapor Permeability) also brought the same result. The antimicrobial properties of the as prepared thin film in the presence of chitosan on agar medium and as a packaging on selected bread showed the Gracilaria sp.-based thin films was able to inhibit the growth of microbes. This antimicrobial activity can be used to declare the potential of Gracilaria sp.-based thin film as a new active food packaging.

Food Packaging Potential of Some Novel Degradable Starch-Polyethylene Plastics1

1994 ◽  
Vol 57 (11) ◽  
pp. 1007-1012 ◽  
Author(s):  
M. KIM ◽  
A. L. POMETTO
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Food Packaging ◽  
Oxygen Permeability ◽  
Starch Content ◽  
Polyethylene Films ◽  
Paraffin Oil ◽  
And Storage ◽  
Potential Use

The food-packaging potential of 12 degradable starch-polyethylene films containing cornstarch, low- or high-molecular-weight oxidized polyethylene and pro-oxidant was evaluated. Mechanical properties of the films were affected more by acids than by alkali, but the film was stable in paraffin oil. Starch in the films did not impair heat-sealing ability. Water vapor transmission increased with increasing starch content but was not affected by oxidized polyethylene. Oxygen and carbon dioxide permeability were not affected by starch or oxidized polyethylene, but nitrogen permeability was affected by starch. Oil oxidation was stimulated by pro-oxidant and high-molecular-weight oxidized polyethylene in films. Film starch content, oxygen permeability, and water permeability did not accelerate microbial growth, and the mechanical properties of most films were not reduced after use. These results suggest that these degradable starch-polyethylene films have some potential use as primary food containers for some food products and storage requirements.

scholarly journals Investigation of Selected Utility Properties of Woven Fabrics Made of Soybean Protein Fibres

2019 ◽  
Vol 27 (6(138)) ◽  
pp. 39-45 ◽  
Author(s):  
Małgorzata Matusiak ◽  
Dominika Kamińska
Keyword(s):  
Mechanical Properties ◽  
Water Vapour ◽  
Moisture Transport ◽  
Soybean Protein ◽  
Good Alternative ◽  
Woven Fabrics ◽  
Utility Value ◽  
Renewable Sources ◽  
Vapour Permeability

Soybean Protein Fibres (SPF) are man-made fibres manufactured from the proteins contained in soybeans. They are biodegradable fibres derived from renewable sources, friendly for people and the environment. Within the framework of the work presented, selected utility properties of fabrics containing SPFs were investigated. The scope of the investigation included determination of mechanical properties, drapeability, water-vapour permeability and liquid moisture transport. The investigations carried out allowed to evaluate the utility value of fabrics made with the use of SPFs and to compare the fabric 100% made of SPFs with ones with weft yarns other than from SPFs. The research showed that fabrics with SPFs are suitable for clothing products, which may be a very good alternative to the currently available clothing made from fabrics containing standard natural and chemical fibres.

Optimization of Selected Parameters and Procedures in Small Punch Test Methodology

2020 ◽  
Author(s):  
Radim Kopriva ◽  
Petra Klatovska ◽  
Katerina Rusnakova ◽  
Petr Gal ◽  
Ivana Eliasova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Tests ◽  
Structural Materials ◽  
Pressure Vessels ◽  
Experimental Program ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Current State

Abstract Assessment of reactor pressure vessels and other industrial components structural materials properties is currently based on the principles of using standardized and long-term employed methods of mechanical properties testing (e.g. impact tests, tensile tests). For the assessment of the current state and degradation prediction of an operated component, implementation of structural materials tests is nonetheless very complicated in terms of the availability of the material volume required to realization of tests in accordance with current normative documentation requirements. Due to the problematic material sampling from the operated component without affecting its integrity, more and more attention is paid to the implementation of perspective methods of evaluation of mechanical properties in processes of industrial component safe operation evaluation. These methods are mainly based on a semi-destructive approach allowing direct sampling of small volumes of material from the operated component and subsequent determination of mechanical properties using miniaturized test specimens. One of the most widespread perspective methods is the small punch test (SPT) - method based on the controlled deformation of thin sheets. The subject of the paper is the optimization of selected small punch test parameters, preparation technology of testing specimens and determination of suitable geometry of experimental fixtures, that are used for experiments in the testing laboratories. Within the experimental program attention is especially paid to the comparison of receiving hole edge configuration - radius/chamfer edge. The aim of the paper is to solve several open questions in the current state of small punch testing methodology and to obtain a comprehensive basis for the implementation of resulting recommendations into the process of currently ongoing standardization within the normative organizations ASTM and EN. This is achieved through a program of experimental tests and computational analyses (FEM) on the IAEA correlation material A533B (JRQ).

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