The Study of Zeolitic Imidazolate Framework (ZIF-8) Doped Polyvinyl Alcohol/Starch/Methyl Cellulose Blend Film

This study evaluated the physical, mechanical, barrier properties, and transition temperatures of poly (vinyl alcohol) (PVA) films with embedded zeolitic imidazolate framework-8 (ZIF-8) nanoparticles carrying a natural antimicrobial, trans-cinnamaldehyde (TC). The ZIF-8 nanoparticles were synthesized using a sonochemical method and incorporated into polymeric matrices at mass ratio concentrations of 0% (control film) to 5% weight of ZIF-8@TC to PVA. Solutions were mixed, cast onto Petri dishes and dried for 12 h at 37 • C in a ventilated oven. The film samples were stored in airtight containers at room temperature and used within 1 week. The engineering properties of the PVA/ZIF-8@TC films were compared with those of low-density polyethylene (LDPE) film commonly used for packaging of spinach leaves. The glass transition, melting, and crystallization temperatures of PVA compositive films all increased (p < 0.05) with ZIF-8@TC concentration. When exposed to high relative humidity environments, the PVA/ZIF-8@TC films had lower equilibrium moisture content (p < 0.05) than the LDPE film. Although the composite films have different tensile properties from the LDPE film, embedding ZIF-8@TC into PVA films improved the tensile strength by 17%, making the PVA/ZIF-8@TC films suitable for low load-bearing applications such as food packaging. The gas barrier properties of PVA-based films differed only slightly with added ZIF-8@TC (p < 0.05).

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“…All films were transparent, though the incorporation of ZIF‐8@TC produced opacity and white color, as it was also observed by Lee et al. (2019).…”

Section: Resultssupporting

confidence: 81%

Properties of poly (vinyl alcohol) films with embedded zeolitic imidazolate framework (ZIF‐8) nanoparticles for food packaging applications

Hara

Castell‐Perez

Moreira

2023

Journal of Food Science

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“…After that, the concentration of the ZIF-67 amount continued to increase the tensile strength of the film, only to decrease again, and the tensile strength was overall lower in comparison to the neat PVA film. This can be ascribed due to the sintering and highly porous structure of the ZIF-67, which enormously lowers the uniformity of the composite membrane [ 49 ]. It can be observed from the results that the percentage strain at a breakpoint is reduced as related to neat PVA/starch films.…”

Section: Resultsmentioning

confidence: 99%

Metal Organic Frameworks Derived Sustainable Polyvinyl Alcohol/Starch Nanocomposite Films as Robust Materials for Packaging Applications

et al. 2021

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Bio-nanocomposites-based packaging materials have gained significance due to their prospective application in rising areas of packaged food. This research aims to fabricate biodegradable packaging films based upon polyvinyl alcohol (PVA) and starch integrated with metal-organic frameworks (MOFs) or organic additives. MOFs offer unique features in terms of surface area, mechanical strength, and chemical stability, which make them favourable for supporting materials used in fabricating polymer-based packaging materials. zeolitic imidazolate frameworks (ZIFs) are one of the potential candidates for this application due to their highly conductive network with a large surface area and high porosity. Present research illustrates a model system based on ZIF-67 (C8H10N4Co) bearing 2–10 wt.% loading in a matrix of PVA/starch blend with or without pyrolysis to probe the function of intermolecular interaction in molecular packing, tensile properties, and glass transition process. ZIF-67 nanoparticles were doped in a PVA/starch mixture, and films were fabricated using the solution casting method. It was discovered through scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR) that addition of ZIF-67 and pyrolyzed ZIF-67 changed and enhanced the thermal stability of the membrane. Moreover, 2–10 wt.% loading of ZIF-67 effected the thermal stability, owing to an interlayer aggregation of ZIF-67. The membranes containing pyrolyzed ZIF-67 showed mechanical strength in the order of 25 MPa in a moderate loading of pyrolyzed ZIF-67 (i.e., at 4 wt.%). The crystallinity enhanced by an increment in ZIF-67 loading. On the other hand, pyrolyzed ZIF-67 carbon became amorphous because of the inert environment and elevated temperature. The surface area also increased after the pyrolysis, which helped to increase the strength of the composite films.

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“…The two patterns show almost identical features with only one peak shift of 100-M toward a lower wave number at 1418 cm −1 . This peak was assigned to C─H bending of the imidazole ring ( 30 ), suggesting that the 2-MIM in 100-M was less perturbed compared with Ran-M. This observation may be due to the result that the oriented membrane has crystals aligned well with each other, leading to less grain boundary defects, thus less associated chemical bond distortions.…”

Section: Resultsmentioning

confidence: 99%

Carbon nanotube supported oriented metal organic framework membrane for effective ethylene/ethane separation

et al. 2022

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Zeolitic imidazolate framework 8 (ZIF-8) is effective for C 3 H 6 /C 3 H 8 separation because of the “sieving effect” of a six-membered (6-M) window. Here, we demonstrate that ZIF-8 is a versatile material that could effectively separate C 2 H 4 from C 2 H 6 via its 4-M window along the <100> direction. We established a facile and environmentally friendly carbon nanotube (CNT)–induced oriented membrane (CNT-OM) approach to fabricate a {100}-oriented ZIF-8 membrane (100-M). In this approach, 2-methyimidazole was anchored onto the CNT surface followed by 3-hour in situ growth in aqueous solution at room temperature. The obtained 100-M, whose 4-M window is aligned along the transport pathway, showed ~3 times higher C 2 H 4 /C 2 H 6 selectivity than a randomly oriented membrane. Thus, this work demonstrates that the membrane orientation plays an important role in tuning selectivity toward different gas pairs. Furthermore, 100-M exhibited excellent mechanical stability that could sustain the separation performance after bending at a curvature of ~109 m −1 .

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The Study of Zeolitic Imidazolate Framework (ZIF-8) Doped Polyvinyl Alcohol/Starch/Methyl Cellulose Blend Film

Cited by 44 publications

References 46 publications

Properties of poly (vinyl alcohol) films with embedded zeolitic imidazolate framework (ZIF‐8) nanoparticles for food packaging applications

Properties of poly (vinyl alcohol) films with embedded zeolitic imidazolate framework (ZIF‐8) nanoparticles for food packaging applications

Metal Organic Frameworks Derived Sustainable Polyvinyl Alcohol/Starch Nanocomposite Films as Robust Materials for Packaging Applications

Carbon nanotube supported oriented metal organic framework membrane for effective ethylene/ethane separation

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