Synergistic effect of dipentaerythritol and montmorillonite in EVOH‐based nanocomposites

Vannini, Micaela; Marchese, Paola; Celli, Annamaria; Marega, Carla; Marigo, Antonio; Lorenzetti, Cesare

doi:10.1002/app.42265

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…The crystallization temperature decreases with the DPE content, and a second crystallization process, due to the DPE crystals, is also present in the sample containing 5 mol % DPE5. It is notable that DPE crystallization can be hindered by the addition of a nanoclay …”

Section: Resultsmentioning

confidence: 99%

Strategy To Modify the Crystallization Behavior of EVOH32 through Interactions with Low-Molecular-Weight Molecules

Vannini¹,

Marchese²,

Celli³

et al. 2016

Ind. Eng. Chem. Res.

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EVOH32 is a semicrystalline copolymer with high barrier performances and therefore suitable for packaging applications. In order to improve its processability through a decrement of its crystallization temperature from the molten state, EVOH32 was mixed with a wide range of low-molecularweight additives. The strategy is based on the possibility that the additives create hydrogen or covalent bonds with the OH groups of the EVOH main chains, thus influencing the crystallization process. Interesting correlations between the chemical nature of the functional groups present in the organic molecules and their effect on the polymer crystallization have been found. 3,5-Dihydroxybenzoic acid turns out to be the most effective molecule to decrease the crystallization temperature of EVOH32.

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Section: Resultsmentioning

confidence: 99%

Strategy To Modify the Crystallization Behavior of EVOH32 through Interactions with Low-Molecular-Weight Molecules

Vannini¹,

Marchese²,

Celli³

et al. 2016

Ind. Eng. Chem. Res.

Self Cite

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“…However, this causes an increment of stiffness and decrement in stretchability that adds some obstacle to the deep thermoforming process or preparation of oriented films. The use of a flexible grade with high amounts of ethylene in the backbone can mitigate this issue, but the barrier performance is also reduced [47]. Chang [48] proposed an alternative solution by blending 3 wt% of Cloisite® 10A to EVOH (73 mol% vinyl alcohol) processed with equibiaxial stretching.…”

Section: Ethylene-vinyl Alcohol (Evoh)mentioning

confidence: 99%

Nanoclays in Food and Beverage Packaging

Bumbudsanpharoke

2019

Journal of Nanomaterials

113

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In this study, we present and discuss the technical benefits of using nanoclays as a promising property enhancer in organic polymers for food and beverage packaging. The incorporation of nanoclays can improve the thermal, mechanical, and barrier properties of a host polymer. Both natural hydrophilic and modified organophilic nanoclays provide unique characteristics to the host polymer depending on the selected applications. Besides the advantage of polymer reinforcement, various novel applications of nanoclays in food packaging have been suggested recently, such as control and release for active ingredients, antimicrobial agent, and carrier for the colorimetric indicator system. The existing migration studies discussing the transition from plastic to nanoclay packaging revealed that the diffused level of aluminum and silicon in the nanoclay packaging are within the limitation proposed in Council Directive 90/128/EEC (1990). Therefore, until now, there is no safety restriction in the use of clay nanocomposite films in food packaging applications.

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“…From the nanocomposites point of view, these two ethylene- and polar-monomer-based copolymers (EVA and EVOH) have a much higher number of polar functional groups than the typically used polyolefin-MAH-grafted copolymers, making them good candidates to produce exfoliated MMT structures. In the case of the binary EVA/MMT nanocomposites, mainly exfoliated structures with intercalated tactoids have been reported [ 25 , 26 , 27 , 28 ], whereas for the binary EVOH/MMT nancomposites, intercalated structures with small exfoliation are seen [ 29 , 30 , 31 , 32 ]. In this way, according to MMT exfoliation, better barrier properties are expected for the PP/EVA/MMT nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene/Ethylene—And Polar—Monomer-Based Copolymers/Montmorillonite Nanocomposites: Morphology, Mechanical Properties, and Oxygen Permeability

2021

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This research reports the influence of polar monomer contents in ethylene vinyl acetate copolymer (EVA) and ethylene vinyl alcohol copolymer (EVOH) on the morphology, mechanical and barrier properties of polypropylene/ethylene copolymer (PP) reinforced with organically modified montmorillonite (MMT). PP/EVA and PP/EVOH (75/25 wt %) blends were reinforced with 3 wt % MMT in an internal mixer system. Samples were compression-molded into films of 300μ μm. The structural characterization was made using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the mechanical properties were obtained by tension tests and the barrier properties by oxygen transmission rate (OTR). XRD patterns showed a combination of intercalated/exfoliated morphologies for the MMT, with higher d-001 interplanar distance increments for the blends with higher content of polar functional groups. SEM and TEM micrographs complement the results of the XRD analysis and show differences in the morphologies depending on the miscibility of the polyolefin and the polar monomer copolymer. Mechanical properties and oxygen permeability of composites exhibited a higher improvement, by the addition of MMT, for higher intermolecular interactions and most miscible polymeric system of the EVA. These results show that the higher the number of interactions, given by the VA or OH polar functional groups, the morphology and the miscibility between polyolefin and copolymer imply dispersion improvements of the nanocomposites and, in consequence, a higher improvement on the mechanical and barrier properties of the composite material.

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Synergistic effect of dipentaerythritol and montmorillonite in EVOH‐based nanocomposites

Cited by 7 publications

References 17 publications

Strategy To Modify the Crystallization Behavior of EVOH32 through Interactions with Low-Molecular-Weight Molecules

Strategy To Modify the Crystallization Behavior of EVOH32 through Interactions with Low-Molecular-Weight Molecules

Nanoclays in Food and Beverage Packaging

Polypropylene/Ethylene—And Polar—Monomer-Based Copolymers/Montmorillonite Nanocomposites: Morphology, Mechanical Properties, and Oxygen Permeability

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