Transparent composites prepared from bacterial cellulose and castor oil based polyurethane as substrates for flexible OLEDs

Pinto, Elaine Ruzgus Pereira; Barud, Hernane S.; Silva, R. R.; Palmieri, Maurício César; Polito, Wagner Luiz; Calil, Vanessa L.; Cremona, M.; Ribeiro, Sidney J. L.; Messaddeq, Younès

doi:10.1039/c5tc02359a

Cited by 85 publications

(58 citation statements)

References 37 publications

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“…BC is used for different purposes, mainly in food industry (dietary fiber and desserts "nata de coco"), textiles, opto-electronic devices, medical devices (surgical tubes, temporary skin substitutes, contact lens), among others (Pinto et al 2015;Legnani et al 2008;Klemm et al, 2005;Pecoraro et al, 2008;Pinto et al, 2015;Shah and Brown, 2005;Chawlaet al, 2009).…”

Section: Introductionmentioning

confidence: 98%

Komagataeibacter rhaeticus as an alternative bacteria for cellulose production

Machado

Gutierrez²,

Tercjak³

et al. 2016

Carbohydrate Polymers

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A strain isolated from Kombucha tea was isolated and used as an alternative bacterium for the biosynthesis of bacterial cellulose (BC). In this study, BC generated by this novel bacterium was compared to Gluconacetobacter xylinus biosynthesized BC. Kinetic studies reveal that Komagataeibacter rhaeticus was a viable bacterium to produce BC according to yield, thickness and water holding capacity data. Physicochemical properties of BC membranes were investigated by UV-vis and Fourier transform infrared spectroscopies (FTIR), thermogravimetrical analysis (TGA) and X-ray diffraction (XRD). Additionally, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were also used for morphological characterization. Mechanical properties at nano and macroscale were studied employing PeakForce quantitative nanomechanical property mapping (QNM) and dynamic mechanical analyzer (DMA), respectively. Results confirmed that BC membrane biosynthesized by Komagataeibacter rhaeticus had similar physicochemical, morphological and mechanical properties than BC membrane produced by Gluconacetobacter xylinus and can be widely used for the same applications.

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Section: Introductionmentioning

confidence: 98%

Komagataeibacter rhaeticus as an alternative bacteria for cellulose production

Machado

Gutierrez²,

Tercjak³

et al. 2016

Carbohydrate Polymers

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“…However,t he intrinsic properties of wood, including low corrosion resistance, poor mechanical performance, flammability,n on-transparency, and non-thermal conductivity,have limited its applicationsinthe building indus-try. [12,13] The modified wood has been extensively utilized in energysaving window applications owing to its comparable optical transmittance, good thermal insulation, and favorable mechanical performance in comparison with the traditional glass. [7][8][9][10] To address the issue of energy shortage, it is highly desired to reduce the energy consumption of residential and commercial buildings, because they account for over 50 %o ft he total energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…[11] Recently,d ifferent types of cellulose from various sourcesw eret ested to prepare transparent materials, such as bacterial or tunicate. [12,13] The modified wood has been extensively utilized in energysaving window applications owing to its comparable optical transmittance, good thermal insulation, and favorable mechanical performance in comparison with the traditional glass. [14] The transparent wood was mainly fabricated by removing light-absorbing substancesa nd introducing ar efractive indexmatching polymer.…”

Section: Introductionmentioning

confidence: 99%

Large‐Size Transparent Wood for Energy‐Saving Building Applications

et al. 2018

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As an energy‐saving building material, transparent wood (TW) is highly attractive because of the advantages of high optical transmittance, excellent mechanical properties, and good thermal insulation. However, the current research is limited to fabricating small‐size samples in the laboratory because thick or large‐size transparent wood is almost impossible to be achieved. A method that can easily and efficiently produce transparent wood with any size and any thickness is desirable for practical applications. Transparent wood made from wood fibers as a substrate allows the cell walls to bind more tightly to the impregnated polymer, resulting in high light transmittance. Compared with wood prepared by using previously reported approaches, the transparent wood prepared by this new method not only retains the same advantages but also has higher preparation efficiency and is suitable for large‐scale production. Under a simulated real environment, the retainability of indoor temperature by a sample house utilizing the transparent wood reveals excellent thermal insulation of the fiber‐based transparent wood owing to its low thermal conductivity, showing significant benefits in saving thermal energy.

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“…The poor mechanical properties hindered their use in structural applications, which is probably responsible for abandonment of castor oil in the modern polyurethane industry. The requirement for sustainable development has triggered renewed interest in fabrication of polyurethanes from castor oil in recent years [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

Chen

et al. 2018

Sci. China Mater.

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Sustainable polyurethanes prepared from castor oil and diisocyanates show very low strength and toughness, due to the highly cross-linked and flexible structure. Herein, we report a new strategy to simultaneously reinforce and toughen castor oil-based polyurethane via incorporating a stiff component (isosorbide, IS) to enhance network stiffness and reduce crosslink density. The crosslinking degree decreases while the strength, moduli, ductility and heat resistance significantly increase accordingly with increasing IS content. The tensile behaviors are tunable over a broad range (either as elastomers or as plastics) depending on the compositions. The polyurethanes show excellent thermal stability with onset decomposition temperature higher than 280°C. The investigation provides a new hint for future design and fabrication of high performance sustainable polymers from other vegetable oils.

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Transparent composites prepared from bacterial cellulose and castor oil based polyurethane as substrates for flexible OLEDs

Abstract: Flexible and transparent BC/PU composites were prepared, which exhibit excellent transparency (up to 90%) in the visible region and great mechanical properties, with a tensile strength of up to 69 MPa and a Young's modulus of up to 6 GPa.

Cited by 85 publications

References 37 publications

Komagataeibacter rhaeticus as an alternative bacteria for cellulose production

Komagataeibacter rhaeticus as an alternative bacteria for cellulose production

Large‐Size Transparent Wood for Energy‐Saving Building Applications

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

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