Nanocomposites of moisture-sensitive polymers and biopolymers with enhanced performance for flexible packaging applications

Lagarón, José M.; Núñez, Eugenia

doi:10.1177/8756087911427756

Cited by 30 publications

(18 citation statements)

References 11 publications

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“…Flake-filled polymeric composites, incorporating mica, glass or metallic flakes have found many uses in this direction, as they offer significant processing and property advantages, namely high dimensional stability and low warpage in molding, uniform in-plane mechanical properties, corrosion protection, sound insulation as well as appearance and color control [3] [4] [5] [6] [7]. Micron-sized flakes of inorganic materials such as mica, nano-scale platelets of clay minerals such as hectrite, saponite and montmorillonite and more recently graphene-oxide platelets of aspect ratios well over 1000, have been used for this purpose [8].…”

Section: Introductionmentioning

confidence: 99%

The Barrier Properties of Flake-Filled Composites with Precise Control of Flake Orientation

Tsiantis¹,

Papathanasiou²

2017

MSA

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Additive manufacturing, especially in the form of 3D printing, offers the exciting possibility of generating heterogeneous articles with precisely controlled internal microstructure. One area in which this feature can be of significant advantage is in diffusion control, specifically in the design and fabrication of microstructures which optimize the rate of transport of a solute to and from a contained fluid. In this work we focus on the use of flakes as diffusion-control agents and study computationally and theoretically the effect of orientation on the barrier properties of flake-filled composites. We conducted over 1500 simulations in two-dimensional, doubly-periodic unit cells each containing up to 3000 individual flake cross-sections which are randomly placed and with their axes forming an angle ( π 2 θ − ) with the direction of macroscopic diffusion. We consider long-flake systems of aspect ratio ( α ) 100 and 1000, from the dilute ( 0.01 αϕ = ) and into the concentrated ( 40 αϕ = ) regime. Based on the rotation properties of the diffusivity tensor, we derive a model which is capable of accurately reproducing all computational results ( 0.01 40 αϕ < < and 0 π 2 θ < < ). The model requires as inputs the two principal diffusivities of the composite, normal and parallel to the flake axis. In this respect, we find the models of Lape et al. [1] and Nielsen [2] form an excellent combination.Both our model and our computational data predict that at 0 θ > the quadratic dependence of the Barrier Improvement Factor (BIF) on ( αϕ ) is lost, with the BIF approaching a plateau at higher values of ( αϕ ). This plateau is lower as ( θ ) increases. We derive analytical estimates of this maximum achievable BIF at each level of misalignment; these are also shown to be in excellent agreement with the computational results. Finally we show that our computational results and model are in agreement with experimental evidence at small values of ( θ ).

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Section: Introductionmentioning

confidence: 99%

The Barrier Properties of Flake-Filled Composites with Precise Control of Flake Orientation

Tsiantis¹,

Papathanasiou²

2017

MSA

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“…Moreover, packaging materials should protect food from ultraviolet light 102 . Therefore, the development of transparent films with increased UV protection is relevant in packaging industry 103 . PHB acts as a better light barrier in ultraviolet and the visible light regions 21 Nanocomposite film of PHA Introduction of nanocomposites based on PHAs and inorganic or organic nanofillers may bring about improved opportunities for their application in food packaging 104 .…”

Section: Blendingmentioning

confidence: 99%

Application of Poly(hydroxyalkanoate) In Food Packaging: Improvements by Nanotechnology

Khosravi‐Darani¹

2015

Chem.Biochem.Eng.Q.

129

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The environmental impact of plastic usage is of critical concern and too great to repair. A shift toward biodegradable food packaging is one option. The aim of this review paper is the study of the potential of biodegradable materials for food packaging. The main characteristics in relation to food usage can be narrowed down to mass transfer (gas and water vapor), thermal and mechanical properties. Among several kinds of biodegradable polymers, poly(hydroxyalkanoate) is one of the favorable candidates for food packaging due to its physical and mechanical properties, biodegradability, with low permeability for O 2 , H 2 O and CO 2 without residues of catalysts and water solubility. The main focus of this article is to address poly(hydroxyalkanoate) as a potential candidate for food packaging. The need of applying biobased polymers in food packaging is presented in the introduction of this study. We also describe the most common biopolymers providing a brief overview of classification and application. This is followed by an outline of biopolymer production and a main section in which the properties of poly(hydroxybutyrate)-based nanocomposites of greatest relevance to food packaging are discussed. Furthermore, several approaches for improvement of poly(hydroxybutyrate) properties are described and the role of nanotechnology to improve its mechanical properties is presented. Finally, the article concludes with a summary as well as some possible future trends.

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“…6,7 Polymer-based composite materials can be prepared by dispersion, interlamellar polymerization, or melting to provide not only enhanced barrier properties, but also better mechanical behavior and thermal stability. 8,9 However, significant research efforts are still being devoted to the development of materials that can improve the performance and stability of the composite.…”

Section: Introductionmentioning

confidence: 99%

“…Among the materials available in the field of dispersion coatings, polyvinyl alcohol (PVOH) is one of the most important; indeed, it has often been investigated alone or together with different fillers as to its suitability as a composite barrier layer. 7,15 PVOH has good film-forming properties and is a great O 2 barrier, but has the drawback of being significantly water sensitive. The addition of clay can improve the barrier properties under humid conditions: the tortuous pathways introduced to the water molecules lower interaction with the polymer phase.…”

Section: Introductionmentioning

confidence: 99%

The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen

et al. 2017

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This paper presents a study of the effect of moisture on the gas permeability of polyvinyl alcohol (PVOH) and PVOH-kaolin dispersion barrier coatings. The oxygen permeability was measured at different humidity levels, and the material properties were characterized under the same conditions: polymer crystallinity, kaolin concentration, and kaolin orientation were all evaluated. The experimental results revealed that the water plasticizes the PVOH material of the coatings, and the presence of kaolin filler is unable to affect such behavior significantly. The PVOH crystallinity was affected drastically by the humidity, as water melts polymer crystallites, which is a reversible process under removal of water. The permeability data were analyzed using a thermodynamicbased model able to account for the water effect on both the solubility of the gas and the diffusivity coefficients in the polymer and composite. The results showed good agreement between the model's predictions and the experimental data in terms of the overall permeability of the material.

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Nanocomposites of moisture-sensitive polymers and biopolymers with enhanced performance for flexible packaging applications

Cited by 30 publications

References 11 publications

The Barrier Properties of Flake-Filled Composites with Precise Control of Flake Orientation

The Barrier Properties of Flake-Filled Composites with Precise Control of Flake Orientation

Application of Poly(hydroxyalkanoate) In Food Packaging: Improvements by Nanotechnology

The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen

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