scholarly journals Increasing the Gas Barrier Properties of Polyethylene Foils by Coating with Poly(Methyl Acrylate)-Grafted Montmorillonite Nanosheets

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3228
Author(s):  
Judith E. Rauschendorfer ◽  
Philipp Vana
Keyword(s):  
Methyl Acrylate ◽  
Food Packaging ◽  
Gas Permeability ◽  
Barrier Properties ◽  
Gas Diffusion ◽  
Gas Barrier ◽  
Grafted Polymer ◽  
Flexible Polymer ◽  
Brick And Mortar ◽  
The Impact

Low-density polyethylene (LDPE) foils were coated with a thin film of polymer-grafted Montmorillonite (MMT) nanosheets, which form a barrier against gas diffusion due to their unique brick-and-mortar arrangement. The MMT nanosheets were grafted with poly(methyl acrylate) (PMA), a soft and flexible polymer. Already very thin films of this nanocomposite could reduce gas permeability significantly. The impact of the topology of the surface-grafted polymer on gas permeability was also studied. It was found that grafting MMT nanosheets with a mixture of star-shaped and linear PMA and with PMA that is cross-linked via hydrogen bonds further decrease gas permeability. The presented strategy is quick and simple and allows for the easy formation of effective gas barrier coatings for LDPE foils, as used in food packaging.

Modification of Polylactic Acid/ Halloysite Bionanocomposites Using Electron Beam Radiation: Physical, Barrier and Thermal Properties

2020 ◽  
Vol 1002 ◽  
pp. 57-65
Author(s):  
Abdulkader M. Alakrach ◽  
Nik Noriman Zulkepli ◽  
Awad A. Al-Rashdi ◽  
Sam Sung Ting ◽  
Rosniza Hamzah ◽  
...  
Keyword(s):  
Electron Beam ◽  
Polylactic Acid ◽  
Food Packaging ◽  
Electron Beam Irradiation ◽  
Casting Process ◽  
Barrier Properties ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Electron Beam Processing ◽  
The Impact

This study aimed to develop novel Polylactic acid/ Halloysite (PLA/ HNTs) films which showed better properties when they were used for food packaging. They also displayed better mechanical, barrier, morphological and structural properties when the researchers analysed the impact of the electron beam irradiation on the nanomaterials. They prepared PLA-based nanocomposites containing 5 % w/w of HNTs using the solution casting process. These nanocomposites were further exposed to different ebeam doses (i.e., 0, 20, 40 and 60 kGy). The researchers assessed the effect of the electron beam irradiation on the various properties of the PLA. All the composites showed a homogenous dispersion and distribution of the HNTs in this PLA matrix. Results indicated that the nanocomposites showed better barrier properties in comparison to the neat PLA. Furthermore, the ebeam irradiation could increase the glass-transition temperature and lead to the development of more crosslinks, which increased the degradation temperature and hydrophilicity of the nanocomposites. In this study, the researchers showed that the PLA/HNTs films were effective materials that could be used for the electron beam processing of the pre-packed foods. The best effect was noted for the 20 kGy dosage which was used in the study.

scholarly journals Multi-scale analysis of the impact of polylactide morphology on gas barrier properties

Polymer ◽  
2017 ◽  
Vol 108 ◽  
pp. 163-172 ◽  
Author(s):  
Samira Fernandes Nassar ◽  
Alain Guinault ◽  
Nicolas Delpouve ◽  
Véronique Divry ◽  
Violette Ducruet ◽  
...  
Keyword(s):  
Barrier Properties ◽  
Scale Analysis ◽  
Gas Barrier ◽  
Multi Scale ◽  
The Impact ◽  
Multi Scale Analysis ◽  
Gas Barrier Properties

Gas permeability, mechanical behaviour and compostability of fully-aliphatic bio-based multiblock poly(ester urethane)s

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55331-55342 ◽  
Author(s):  
Laura Genovese ◽  
Michelina Soccio ◽  
Matteo Gigli ◽  
Nadia Lotti ◽  
Massimo Gazzano ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Gas Permeability ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Gas Barrier Properties

Bio-based and compostable poly(ester urethane)s with tailorable mechanical and gas barrier properties designed for packaging purposes.

The impact of microwave-assisted thermal sterilization on the morphology, free volume, and gas barrier properties of multilayer polymeric films

2014 ◽  
Vol 131 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sumeet Dhawan ◽  
Christopher Varney ◽  
Gustavo V. Barbosa-Cánovas ◽  
Juming Tang ◽  
Farida Selim ◽  
...  
Keyword(s):  
Free Volume ◽  
Barrier Properties ◽  
Polymeric Films ◽  
Gas Barrier ◽  
Microwave Assisted ◽  
Thermal Sterilization ◽  
The Impact ◽  
Gas Barrier Properties

scholarly journals Manufacturing of Food Packaging Based on Nanocellulose: Current Advances and Challenges

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1726
Author(s):  
Ghislain Fotie ◽  
Sara Limbo ◽  
Luciano Piergiovanni
Keyword(s):  
High Performance ◽  
Food Packaging ◽  
Coating Layer ◽  
Scale Up ◽  
Barrier Properties ◽  
Synthetic Polymers ◽  
Layer By Layer ◽  
Gas Barrier ◽  
Industrial Manufacturing ◽  
Made In

Nowadays, environmental pollution due to synthetic polymers represents one of the biggest worldwide challenges. As demonstrated in numerous scientific articles, plant-based nanocellulose (NC) is a biodegradable and nontoxic material whose mechanical, rheological, and gas barrier properties are competitive compared to those of oil-based plastics. However, the sensitivity of NC in humid ambient and lack of thermosealability have proven to be a major obstacle that hinders its breakthrough in various sectors including food packaging. In recent years, attempts have been made in order to provide a hydrophobic character to NC through chemical modifications. In addition, extensive works on nanocellulose applications in food packaging such as coating, layer-by-layer, casting, and electrospinning have been reported. Despite these enormous advances, it can easily be observed that packaging manufacturers have not yet shown a particular interest in terms of applicability and processability of the nanocellulose due to the lack of guidelines and guarantee on the success of their implementation. This review is useful for researchers and packaging manufacturers because it puts emphasis on recent works that have dealt with the nanocellulose applications and focuses on the best strategies to be adopted for swift and sustainable industrial manufacturing scale-up of high-performance bio-based/compostable packaging in replacement of the oil-based counterparts used today.

Effects of the Processing Methods on the Gas Permeability of PLA/Sepiolite Thin Films: Solution Casting versus Thermo Compression

2014 ◽  
Vol 695 ◽  
pp. 187-190
Author(s):  
Nima Moazeni ◽  
Zurina Mohamad ◽  
Nazila Dehbari
Keyword(s):  
Thin Films ◽  
Gas Permeability ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Poly Lactic Acid ◽  
Solvent Casting ◽  
Solution Casting ◽  
Compression Method ◽  
Gas Barrier ◽  
Biodegradable Poly

A biodegradable poly-lactic acid (PLA)/Sepiolite nanocomposite films were prepared by the thermo-compression and solvent-casting methods, and barrier properties (water-vapor and gas barrier) were evaluated. By introducing sepiolite into PLA, the properties of nanocomposite films improved until a certain amount (1.5% wt). By increasing sepiolite loading, nanoparticles tented to agglomerate and gas permeability (GP) decreased. According to the results, the nanocomposite films prepared by the thermo-compression method were more brittle but strong due to the formation of more crystals; while solvent-casted films were more ductile due to the presence of solvent, which may act as a plasticizer, as evidenced by the results of the GP.

Morphology and gas barrier properties of thin SiOxcoatings on polycarbonate: Correlations with plasma-enhanced chemical vapor deposition conditions

2000 ◽  
Vol 15 (3) ◽  
pp. 704-717 ◽  
Author(s):  
Ahmet G. Erlat ◽  
Bo-Chy Wang ◽  
Richard J. Spontak ◽  
Yelena Tropsha ◽  
Kevin D. Mar ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Food Packaging ◽  
Chemical Vapor ◽  
Barrier Properties ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Gas Barrier ◽  
Gas Barrier Properties ◽  
Deposition Conditions

Plasma-enhanced chemical vapor deposition of SiOx coatings on thermoplastics provides a viable route for production of transparent composite materials with high fracture toughness and high gas barrier properties, which are important considerations in the food packaging and biomedical device industries. By examining several series of systematically varied SiOx/polycarbonate composites, we have identified design correlations between coating characteristics (thickness, density, surface roughness, and O2 transmission) and deposition conditions (time, power, pressure, and flow rates). Of particular interest is the observation that the thermal activation energy for O2 permeation through these composites increases (by up to 17 kJ/mol) as their barrier efficacy increases.

scholarly journals Poly(propylene 2,5-thiophenedicarboxylate) vs. Poly(propylene 2,5-furandicarboxylate): Two Examples of High Gas Barrier Bio-Based Polyesters

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 785 ◽  
Author(s):  
Giulia Guidotti ◽  
Michelina Soccio ◽  
Nadia Lotti ◽  
Massimo Gazzano ◽  
Valentina Siracusa ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Co2 Gas ◽  
Synthetic Strategy ◽  
Different Temperatures ◽  
Points Of View ◽  
Poly Propylene ◽  
Better Than

Both academia and industry are currently devoting many efforts to develop high gas barrier bioplastics as substitutes of traditional fossil-based polymers. In this view, this contribution presents a new biobased aromatic polyester, i.e., poly(propylene 2,5-thiophenedicarboxylate) (PPTF), which has been compared with the furan-based counterpart (PPF). Both biopolyesters have been characterized from the molecular, thermo-mechanical and structural points of view. Gas permeability behavior has been evaluated with respect to 100% oxygen, carbon dioxide and nitrogen at 23 °C. In case of CO2 gas test, gas transmission rate has been also measured at different temperatures. The permeability behavior at different relative humidity has been investigated for both biopolyesters, the thiophen-containing sample demonstrating to be better than the furan-containing counterpart. PPF’s permeability behavior became worse than PPTF’s with increasing RH, due to the more polar nature of the furan ring. Both biopolyesters under study are characterized by superior gas barrier performances with respect to PEF and PET. With the simple synthetic strategy adopted, the exceptional barrier properties render these new biobased polyesters interesting alternatives in the world of green and sustainable packaging materials. The different polarity and stability of heterocyclic rings was revealed to be an efficient tool to tailor the ability of crystallization, which in turn affects mechanical and barrier performances.

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