Nylon-MXD6 resins for food packaging

Ammala, Anne

doi:10.1533/9780857092786.1.243

Cited by 10 publications

(7 citation statements)

References 10 publications

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“…On the other hand, MXD6 (Scheme ) is a semicrystalline material, intensely used in food packaging applications thanks to its excellent gas barrier performances (the best results as compared to all nylons), good processability (it is easily stretched and/or thermoformed because of its moderate crystallization rate), easy combination (by co‐extrusion or co‐injection) with other nylons to improve properties, and/or processing window . However, it was found that the MXD6 oxygen permeability increases significantly with relative humidity, presumably in relation to an increase of the oxygen diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Block and random copolyamides of poly(m‐xylylene adipamide) and poly(hexamethylene isophthalamide‐co‐terephthalamide): Methods of preparation and relationships between molecular structure and phase behavior

Vannini

Marchese

Celli

et al. 2014

Polymer Engineering & Sci

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Copolymerization of poly(m-xylylene adipamide) (MXD6) and poly(hexamethylene isophthalamide-co-terephthalamide) (PA6I-6T) was used as an efficient strategy to prepare amorphous homogeneous systems with improved properties mainly for packaging applications. The preparation of block copolymers was first of all tried by coextrusion of the two polymers and then by thermal treatments at high temperatures in DSC or mixing in Brabender, also in the presence of a catalyst. The occurrence of transamidation reactions led to macromolecular structures with different randomness degrees. Further, random copolymers, with the full range of compositions, were synthetized from monomers, by a fast and simple twostage melt polycondensation. For all the copolymers, the sequence distribution was studied by using a 1 H NMR method developed by the Authors. The effects of preparation procedures, of mixing temperature and time, of the presence of a catalyst on the chemical structure, and, then, on final properties were studied. Interesting correlations among block length, monomer distribution and phase behavior were discussed. POLYM. ENG. SCI., 55:1475-1484

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Section: Introductionmentioning

confidence: 99%

Block and random copolyamides of poly(m‐xylylene adipamide) and poly(hexamethylene isophthalamide‐co‐terephthalamide): Methods of preparation and relationships between molecular structure and phase behavior

Vannini

Marchese

Celli

et al. 2014

Polymer Engineering & Sci

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“…While o-phthalodinitrile is almost exclusively used for the synthesis of phthalocyanine dyes (! Phthalocyanines), m-phthalodinitrile is almost exclusively hydrogenated to m-xylylenediamine, which is mainly used for the production of Nylon-MXD6 [270].…”

Section: ð104þmentioning

confidence: 99%

Oxidation

Teles

Hermans

Franz³

et al. 2015

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Overview of industrial oxidation processes 2.1. Inorganic chemicals 2.1.1. Sulfur derivatives 2.1.2. Carbon derivatives 2.1.3. Nitrogen derivatives 2.1.4. Chlorine derivatives 2.2. Organic chemicals 2.2.1. Olefins and alkynes 2.2.2. Epoxides 2.2.3. Hydroperoxides 2.2.4. Alcohols 2.2.5. Aldehydes 2.2.6. Ketones 2.2.7. Phenols and derivatives 2.2.8. Carboxylic acids, saturated 2.2.9. Carboxylic acids and anhydrides, unsaturated 2.2.10. Carboxylic acids and anhydrides, aromatic 2.2.11. Esters, lactones and carbonates 2.2.12. Nitriles 2.2.13. Oxidized nitrogen compounds 2.2.14. Chlorinated compounds 2.2.15. Sulfur compounds 3. Thermodynamics; Stability of Hydrocarbons 4. Reaction Types 5. Homolytic Oxidation 5.1. Historical Development; Reaction Mechanism; Radical Reactivity 5.2. Kinetics of Autoxidation 5.3. Differences between Liquid‐ and Gas‐Phase Autoxidations 5.4. Homolytic Oxidation in the Liquid Phase 5.4.1. Secondary Reactions of Radicals, Peroxides, and other Intermediates 5.4.2. Metal Catalysis in Homolytic Liquid‐Phase Oxidation 5.4.3. Inhibitors of Homolytic Liquid‐Phase Oxidation 5.4.4. Special Cases of Homolytic Oxidation 5.4.5. Process Technology of Homolytic Liquid‐Phase Oxidation 5.5. Homolytic Gas‐Phase Oxidation 5.6. Gas Explosions and Safety Data 6. Heterolytic Oxidation 6.1. Heterolytic Oxidation in the Liquid Phase 6.2. Heterogeneously Catalyzed Gas‐Phase Oxidation 6.2.1. Oxidation Catalysts 6.2.2. Process Technology of Heterogeneously Catalyzed Oxidations

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“…[19][20][21][22][23][24][25][26][27][28][29] Among all kinds of oxygen scavengers, polymer-based oxygen scavengers, like hydroxyl-terminated polybutadiene (HTPB) and M-xylylene adipamide (MXD6), have been intensively used due to their advantages of large oxygen scavenging capacity, easy molding and processing, and controllable reaction rate. [30][31][32] However, when the oxygen scavengers with catalyst are introduced into PET to achieve an "active" barrier, the oxygen scavengers change the aggregation structure of PET itself on one hand; on the other hand, the PET molecular chains may even degrade in the presence of catalyst, leading to a decrease in its heat resistance, mechanical property, and even the water vapor barrier property (Figure S1). 33 Usually, to further enhance the PET film's oxygen barrier performance, "passive" or "active" techniques are usually combined to prepare the barrier films.…”

Section: Introductionmentioning

confidence: 99%

“…After the oxygen scavengers are added into PET, the oxygen molecules passing through the film can be continuously captured and depleted, making the diffusion of oxygen in PET become a long‐term unstable state diffusion, thereby effectively promoting the oxygen barrier ability of PET 19–29 . Among all kinds of oxygen scavengers, polymer‐based oxygen scavengers, like hydroxyl‐terminated polybutadiene (HTPB) and M‐xylylene adipamide (MXD6), have been intensively used due to their advantages of large oxygen scavenging capacity, easy molding and processing, and controllable reaction rate 30–32 . However, when the oxygen scavengers with catalyst are introduced into PET to achieve an “active” barrier, the oxygen scavengers change the aggregation structure of PET itself on one hand; on the other hand, the PET molecular chains may even degrade in the presence of catalyst, leading to a decrease in its heat resistance, mechanical property, and even the water vapor barrier property (Figure S1).…”

Section: Introductionmentioning

confidence: 99%

Polyethylene terephthalate bottles with excellent oxygen, water vapor barrier and mechanical performances prepared by injection and blow molding

Zhang,

Tong,

Yang

et al. 2024

Polymer Engineering & Sci

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In this work, the oxygen barrier property of polyethylene terephthalate (PET) films was enhanced by optimizing the “active” and “passive” synergistic barrier approaches, that is, integration of high barrier material polyethylene naphthalate (PEN) and oxygen scavengers along with catalyst with PET before biaxially stretching the PET blended films. When the PEN content in the PET blended films reached 50 wt%, the oxygen permeability coefficient was significantly reduced to 0.9687 cc·mil·m−2·day−1·0.1 MPa−1, showing an enhancement of 117.4 times compared to the pure PET film. Furthermore, the water vapor permeability coefficient was reduced to 8.0208 g·mil·m−2·day−1, representing a 45.5% reduction in comparison to the pristine PET film. It also maintained a higher transverse and longitudinal tensile strength (110.5 and 127.2 MPa) than PET film only with oxygen scavengers and catalyst (53.5 and 78.0 MPa). This work presents a viable and practical approach to endow PET materials with simultaneously enhanced oxygen, water barrier performance, and mechanical property.Highlights The OPC of PET film was as low as 0.9687 cc·mil·m−2·day−1·0.1 MPa−1. The “active” and “passive” barrier techniques together reduced the OPC of PET film.

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Nylon-MXD6 resins for food packaging

Cited by 10 publications

References 10 publications

Block and random copolyamides of poly(m‐xylylene adipamide) and poly(hexamethylene isophthalamide‐co‐terephthalamide): Methods of preparation and relationships between molecular structure and phase behavior

Block and random copolyamides of poly(m‐xylylene adipamide) and poly(hexamethylene isophthalamide‐co‐terephthalamide): Methods of preparation and relationships between molecular structure and phase behavior

Oxidation

Polyethylene terephthalate bottles with excellent oxygen, water vapor barrier and mechanical performances prepared by injection and blow molding

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