Polyelectrolyte Coacervate Coatings That Dramatically Improve Oxygen Barrier of Paper

Iverson, Ethan T.; Legendre, Hudson; Schmieg, Kendra; Palen, Bethany; Kolibaba, Thomas J.; Chiang, Hsu‐Cheng; Grunlan, Jaime C.

doi:10.1021/acs.iecr.2c03908

Cited by 5 publications

(4 citation statements)

References 52 publications

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“…This decrease is believed to be a result of a tortuous pathway blocking small ion transport through the nanocomposite. A similar phenomenon is exploited in gas barrier and anti-corrosion nanocomposites. − Priolo et al reported that the oxygen transmission rate of nanobrick wall films significantly decreases as the inorganic loading increases due to the tortuous pathway. , It is important to note that the dielectric constant of the PEI/PAA + VMT system is lower than any of the systems presented, most likely due to the nanocomposite being loaded with a clay that possesses a low degree of polarization, a phenomenon that has been known to lower a composite’s dielectric constant. , …”

Section: Resultsmentioning

confidence: 96%

Nanobrick Wall Multilayer Thin Films with High Dielectric Breakdown Strength

Iverson,

Legendre,

Chavan

et al. 2023

ACS Appl. Eng. Mater.

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Current thermally conductive and electrically insulating insulation systems are struggling to meet the needs of modern electronics due to increasing heat generation and power densities. Little research has focused on creating insulation systems that excel at both dissipating heat and withstanding high voltages (i.e., have both high thermal conductivity and a high breakdown strength). Herein, a polyelectrolyte-based multilayer nanocomposite is demonstrated to be a thermally conductive high-voltage insulation. Through inclusion of both boehmite and vermiculite clay, the breakdown strength of the nanocomposite was increased by ≈115%. It was also found that this unique nanocomposite has an increase in its breakdown strength, modulus, and hydrophobicity when exposed to elevated temperatures. This readily scalable insulation exhibits a remarkable combination of breakdown strength (250 kV/ mm) and thermal conductivity (0.16 W m −1 K −1 ) for a polyelectrolyte-based nanocomposite. This dual clay insulation is a step toward meeting the needs of the next generation of high-performance insulation systems.

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Section: Resultsmentioning

confidence: 96%

Nanobrick Wall Multilayer Thin Films with High Dielectric Breakdown Strength

Iverson,

Legendre,

Chavan

et al. 2023

ACS Appl. Eng. Mater.

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“…that cause adverse environmental impacts and increase the energy cost and carbon footprint. Some emerging bio-based building blocks such as CNFs and CNCs still face challenging commercial-scale processability for coating application and drying processes due to their low solid content and high viscosity profiles; more efforts on the high solid content grade of nanocellulosic materials and their continuous coating application are being implemented to further explore their commercialization potential. , In comparison, our natural, sustainable, waterborne complex dispersion barrier coating exhibits a combination of the highest grease resistance and reduced moisture sensitivity, as well as has the promise of scale-up for industrial production (see description of scalable manufacturing of complex dispersions in the Supporting Information). Moreover, our material selection and one-pot processing pathway align well with green chemistry principles such as use of renewable feedstocks, benign solvents, design for energy efficiency, and design for degradation …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, we envision that the developed polysaccharide complex barrier coating would be beneficial to the improvement of oxygen barrier performance of the fiber-based or flexible packaging and the shelf-life extension of perishable fruits, which would need further investigation in future work. Indeed, literature works have confirmed that an intimate ionic crosslinking network structure creates superior resistance to oxygen permeation, leading to a high oxygen barrier coating for flexible (biaxially oriented polypropylene) 43 and fiber-based 44 packaging substrates, as well as a protective layer to slow down the ripening or browning of fruits. 45 Figure 6e shows photographs of the liquid barrier performance of paperboard substrates coated with 7.8% complex dispersion.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrostatically Complexed Natural Polysaccharides as Aqueous Barrier Coatings for Sustainable and Recyclable Fiber-Based Packaging

Chi

Lin

et al. 2023

ACS Appl. Mater. Interfaces

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Driven by the ever-growing awareness of sustainability and circular economy, renewable, biodegradable, and recyclable fiberbased packaging materials are emerging as alternatives to fossil-derived, nonbiodegradable single-use plastics for the packaging industry. However, without functional barrier coatings, the water/moisture vulnerability and high permeability of fiber-based packaging significantly restrain its broader application as primary packaging for food, beverages, and drugs. Herein, we develop waterborne complex dispersion barrier coatings consisting of natural, biodegradable polysaccharides (i.e., chitosan and carboxymethyl cellulose) through a scalable, one-pot mechanochemical pathway. By tailoring the electrostatic complexation, the key element to form a highly crosslinked and interpenetrated polymer network structure, we formulate complex dispersion barrier coatings with excellent film-forming property and adaptable solid-viscosity profiles suitable for paperboard and molded pulp substrates. Our complex dispersions enable the formation of a uniform, defect-free, and integrated coating layer, leading to a remarkable oil and grease barrier and efficient water/moisture sensitivity reduction while still exhibiting excellent recyclability profile of the resulting fiber-based substrates. This natural, biorenewable, and repulpable barrier coating is a promising candidate to serve as a sustainable option for fiber-based packaging intended for the food and food service packaging industry.

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“…Thin, flexible, coatings with high oxygen barrier are widely used for improving the shelf life of flexible organic electronics and perishable food products. [1][2][3] Improving the barrier performance of food packaging is particularly important, as every year a staggering 30% of food products are wasted in the United States. [4] Vapor deposited inorganics (SiO x and Al 2 O 3 ) provide remarkable barrier performance, but suffer from pinholes, cracking DOI: 10.1002/mame.202300407 when flexed, and complex/expensive processing conditions (e.g., vacuum /nonambient).…”

Section: Introductionmentioning

confidence: 99%

Dual Clay Nanobrick Wall Thin Films with High Oxygen Barrier at High Humidity

Iverson,

Chiang,

Fisher

et al. 2023

Macro Materials & Eng

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Thin polymer‐based coatings with high oxygen barrier at elevated humidity are needed for the protection of food and organic electronic devices. Polyelectrolyte‐based thin films (deposited via layer‐by‐layer assembly) perform well at ambient humidity, but their performance typically dwindles as humidity increases due to their hydrophilic nature. Retention of their high barrier can be achieved through the addition of chemical crosslinkers or the introduction of inorganic platelets that create a nanobrick wall structure. In this study, a nanobrick wall barrier prepared with two types of clay, with a thickness less than 200 nm, is shown to reduce the oxygen transmission rate (OTR) of 179 µm polyethylene terephthalate to less than 0.016 cm3 m−2 day−1 atm−1. At 90% relative humidity (RH), a quadlayer barrier consisting of polyethylenimine, boehmite clay, poly(acrylic acid), and vermiculite clay maintains nearly 90% of its barrier performance at 0% RH (OTR = 0.019 cm3 m−2 day−1 atm−1). This study demonstrates the potential of dual clay thin film nanocomposites to protect various consumer goods at high humidity.

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Polyelectrolyte Coacervate Coatings That Dramatically Improve Oxygen Barrier of Paper

Cited by 5 publications

References 52 publications

Nanobrick Wall Multilayer Thin Films with High Dielectric Breakdown Strength

Nanobrick Wall Multilayer Thin Films with High Dielectric Breakdown Strength

Electrostatically Complexed Natural Polysaccharides as Aqueous Barrier Coatings for Sustainable and Recyclable Fiber-Based Packaging

Dual Clay Nanobrick Wall Thin Films with High Oxygen Barrier at High Humidity

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