High-consistency milling of oxidized cellulose for preparing microfibrillated cellulose films

Microfibrillated cellulose films have been gathering considerable attention due to their high mechanical properties and cheap cost. Additionally, it is possible to include compounds within the fibrillated structure in order to confer desirable properties. Ilex paraguariensis A. St.-Hil, yerba mate leaf extract has been reported to possess a high quantity of caffeoylquinic acids that may be beneficial for other applications instead of its conventional use as a hot beverage. Therefore, we investigate the effect of blending yerba mate extract during and after defibrillation of Eucalyptus sp. bleached kraft paper by ultrafine grinding. Blending the extract during defibrillation increased the mechanical and thermal properties, besides being able to use the whole extract. Afterwards, this material was also investigated with high content loadings of starch and glycerine. The results present that yerba mate extract increases film resistance, and the defibrillated cellulose is able to protect the bioactive compounds from the extract. Additionally, the films present antibacterial activity against two known pathogens S. aureus and E. coli, with high antioxidant activity and increased cell proliferation. This was attributed to the bioactive compounds that presented faster in vitro wound healing, suggesting that microfibrillated cellulose (MFC) films containing extract of yerba mate can be a potential alternative as wound healing bandages.

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Oxygen and oil barrier properties of microfibrillated cellulose films and coatings

Cellulose ◽

10.1007/s10570-009-9393-y ◽

2010 ◽

Vol 17 (3) ◽

pp. 559-574 ◽

Cited By ~ 405

Author(s):

Christian Aulin ◽

Mikael Gällstedt ◽

Tom Lindström

Keyword(s):

Barrier Properties ◽

Microfibrillated Cellulose ◽

Cellulose Films

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Hydrophobic cellulose films with excellent strength and toughness via ball milling activated acylation of microfibrillated cellulose

Carbohydrate Polymers ◽

10.1016/j.carbpol.2016.07.101 ◽

2016 ◽

Vol 154 ◽

pp. 129-138 ◽

Cited By ~ 32

Author(s):

Sha Deng ◽

Rui Huang ◽

Mi Zhou ◽

Feng Chen ◽

Qiang Fu

Keyword(s):

Ball Milling ◽

Microfibrillated Cellulose ◽

Cellulose Films ◽

Strength And Toughness

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Addition of Al(OH)3 versus AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Cellulose ◽

10.1007/s10570-021-04129-6 ◽

2021 ◽

Author(s):

Tjaša Kolar ◽

Branka Mušič ◽

Romana Cerc Korošec ◽

Vanja Kokol

Keyword(s):

Thermal Management ◽

Oxygen Permeability ◽

Hydrophobic Surface ◽

Exothermic Peak ◽

Microfibrillated Cellulose ◽

Low Oxygen ◽

Cellulose Films ◽

One Step ◽

Thermal Stability Of ◽

Oxygen Transmission

AbstractDifferently structured aluminum (tri/mono) hydroxide (Al(OH)3 /AlO(OH)) nanoparticles were prepared and used as thermal-management additives to microfibrillated cellulose (MFC), cast-dried in thin-layer films. Both particles increased the thermal stability of the MFC film, yielding 20–23% residue at 600 °C, and up to 57% lowered enthalpy (to 5.5–7.5 kJ/g) at 0.15 wt% of loading, while transforming to alumina (Al2O3). However, the film containing 40 nm large Al(OH)3 particles decomposed in a one-step process, and released up to 20% more energy between 300 and 400 °C as compared to the films prepared from smaller (21 nm) and meta-stable AlO(OH), which decomposed gradually with an exothermic peak shifted to 480 °C. The latter resulted in a highly flexible, optically transparent (95%), and mechanically stronger (5.7 GPa) film with a much lower specific heat capacity (0.31–0.28 J/gK compared to 0.68–0.89 J/gK for MFC-Al(OH)3 and 0.87–1.26 for MFC films), which rendered it as an effective heat-dissipating material to be used in flexible opto-electronics. Low oxygen permeability (2192.8 cm3/m2day) and a hydrophobic surface (> 60°) also rendered such a film useful in ecologically-benign and thermosensitive packaging.

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Modification of polyvinyl alcohol/microfibrillated-cellulose films by ethylene triethoxysilane

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925020910878 ◽

2020 ◽

Vol 15 ◽

pp. 155892502091087

Author(s):

Pei-wei Bian ◽

Bin-qing Sun ◽

Li-qiang Huang

Keyword(s):

Polyvinyl Alcohol ◽

Composite Films ◽

Film Surface ◽

Barrier Properties ◽

Microfibrillated Cellulose ◽

Hydrophobic Property ◽

Water Contact ◽

Cellulose Films ◽

Cellulose Composite ◽

Thermal Stability Of

This study aimed to improve the strength and hydrophobic properties of polyvinyl alcohol/microfibrillated-cellulose composite films and thereby solve problems such as the poor water resistance of polyvinyl alcohol films and defects in the packaging. Polyvinyl alcohol/microfibrillated-cellulose composite films were prepared with the silane coupling agent KH151. The mechanical, optical, crystalline, and other properties of the composite films were tested. After the modification of the polyvinyl alcohol/microfibrillated-cellulose films, their strength and hydrophobic and barrier property were greatly improved. Moreover, their oxygen transmittance decreased by 85.9%, and the water contact angle of the film surface increased by 44%. The internal structure of a polyvinyl alcohol/microfibrillated-cellulose film is formed by KH151, which improves the strength and barrier properties of the film, forms an alkane-based layer on the film surface, and improves the hydrophobic property of the film. Thermogravimetric analysis shows that the thermal stability of composite materials has been greatly improved.

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Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

10.21203/rs.3.rs-340825/v1 ◽

2021 ◽

Author(s):

Tjaša Kolar ◽

Branka Mušič ◽

Romana Cerc Korošec ◽

Vanja Kokol

Keyword(s):

Thermal Management ◽

Oxygen Permeability ◽

Hydrophobic Surface ◽

Exothermic Peak ◽

Microfibrillated Cellulose ◽

Low Oxygen ◽

Cellulose Films ◽

One Step ◽

Thermal Stability Of ◽

Oxygen Transmission

Abstract Differently structured aluminum (tri/mono) hydroxide (Al(OH)3 / AlO(OH)) nanoparticles were prepared and used as thermal-management additives to microfibrillated cellulose (MFC), cast-dried in thin-layer films. Both particles increased the thermal stability of the MFC film, yielding 20–23% residue at 600 °C, and up to 57% lowered enthalpy (to 5.5–7.5 kJ/g) at 0.15 wt% of loading, while transforming to Al2O3. However, the film containing 40 nm large Al(OH)3 particles decomposed in a one-step process, and released up to 20 % more energy between 300–400°C as compared to the films prepared from smaller (21 nm) and meta-stable AlO(OH), which decomposed gradually with an exothermic peak shifted to 480 °C. The latter resulted in a highly flexible, optically transparent (95%), and mechanically stronger (5.7 GPa) film with a much lower specific heat capacity (0.31 − 0.28 J/gK compared to 0.68–0.89 J/gK for MFC-Al(OH)3 and 0.87–1.26 for MFC films), which render it as an effective heat-dissipating material to be used in flexible opto-electronics. Low oxygen permeability (2192.8 cm3/m2day) and a hydrophobic surface (>60°) rendered such a film also useful in ecologically-benign and thermosensitive packaging.

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