Enzymatically produced cellulose nanocrystals as reinforcement for waterborne polyurethane and its applications

Alonso-Lerma, Borja; Larraza, Izaskun; Barandiaran, Leire; Ugarte, Lorena; Saralegi, Ainara; Corcuera, María Ángeles; Pérez-Jiménez, Raúl; Eceiza, Arantxa

doi:10.1016/j.carbpol.2020.117478

Cited by 37 publications

(13 citation statements)

References 57 publications

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“…6 shows the WCA curves of the CNF/WPU composite films with different CNF contents; 2 wt% (WPU5) is 35.1°, which is 49.3% lower than that of the pure WPU film. This phenomenon was also reported in studies by Li et al [14] and Borja et al [15] . It may be that a CNF interwoven fiber network is formed on the surface of the composite film, and a large number of hydroxyl groups on the fiber network form hydrogen bonds with water molecules, thus breaking the equilibrium of the surface tension of the water droplets and leading to a decrease in the WCA.…”

Section: Wca Of Wpu and Cnf/wpu Composite Filmssupporting

confidence: 86%

Preparation and Characterization of Cellulose Nanofibril-Waterborne Polyurethane Composite Films

Li¹,

Chen²,

Liu³

et al. 2023

Paper and Biomaterials

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To improve the performance of polyurethane films, small amounts of cellulose nanofibrils (CNF) were physically blended with a waterborne polyurethane (WPU) emulsion, and then CNF/WPU composite films were prepared by cast-coating and drying. The particle size of the emulsions and the chemical structure, micromorphology, thermal stability, mechanical properties, and water resistance of the composite films were characterized using a Malvern laser particle size analyzer, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), an electronic strength machine, water contact angle analysis (WCA), and water absorption tests, respectively. The results showed that at a low CNF content of 0.3 wt% , the particle size of the WPU emulsion and chemical structure of the film did not change significantly. In addition, the tensile strength of the composite film increased by up to 108% compared to the neat WPU film, and the thermal stability and water resistance were slightly improved. The addition of CNF greatly enhanced the tensile strength while maintaining the other original properties of the WPU film, which may greatly improve the service life and tear resistance of commercial coatings in the future.

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Section: Wca Of Wpu and Cnf/wpu Composite Filmssupporting

confidence: 86%

Preparation and Characterization of Cellulose Nanofibril-Waterborne Polyurethane Composite Films

Li¹,

Chen²,

Liu³

et al. 2023

Paper and Biomaterials

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“…Figure 7 a also shows an exothermal event occurring around 150 °C, which is associated to a short-range order–disorder transition corresponding to the hard segments of the WBPU (region associated to the reacted isocyanate molecules) [ 82 , 85 , 86 , 87 ].…”

Section: Resultsmentioning

confidence: 99%

Nanocelluloses Reinforced Bio-Waterborne Polyurethane

et al. 2021

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The aim of this work was to evaluate the influence of two kinds of bio- nano-reinforcements, cellulose nanocrystals (CNCs) and bacterial cellulose (BC), on the properties of castor oil-based waterborne polyurethane (WBPU) films. CNCs were obtained by the acidolysis of microcrystalline cellulose, while BC was produced from Komagataeibacter medellinensis. A WBPU/BC composite was prepared by the impregnation of a wet BC membrane and further drying, while the WBPU/CNC composite was obtained by casting. The nanoreinforcement was adequately dispersed in the polymer using any of the preparation methods, obtaining optically transparent compounds. Thermal gravimetric analysis, Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, dynamical mechanical analysis, differential scanning calorimetry, contact angle, and water absorption tests were carried out to analyze the chemical, physical, and thermal properties, as well as the morphology of nanocelluloses and composites. The incorporation of nanoreinforcements into the formulation increased the storage modulus above the glass transition temperature of the polymer. The thermal stability of the BC-reinforced composites was slightly higher than that of the CNC composites. In addition, BC allowed maintaining the structural integrity of the composites films, when they were immersed in water. The results were related to the relatively high thermal stability and the particular three-dimensional interconnected reticular morphology of BC.

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“…[673] Therefore, a different aqueous PU binary colloidal system was introduced by incorporating hydrophilic monomers, which evolve a new horizon for waterproof wearable textiles. [675,676] Recently, the practice of flexible encapsulant materials such as fully biobased films, [677,294] 3D printing packages, [470] and ultrathin White-EVA film [678,679] has been started which guarantees bright prospects for futuristic energy harvesting and sensing textile devices.…”

Section: Encapsulation and Mountingmentioning

confidence: 99%

Mapping the Progress in Flexible Electrodes for Wearable Electronic Textiles: Materials, Durability, and Applications

Liman

Islam

Hossain

2021

Adv Elect Materials

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With the advancement of nanotechnology and electroactive materials, conventional textiles have transformed into a versatile wearable electronic platform that will inevitably escalate the development of next‐generation flexible electronics. Integration of nanoscale conductive particles such as polymers, metals, or nanocarbons into different structural textile design has simplified the way of personal interactive communications and portable sensing by distributing superior stretchability and functionality in a smart textile device. However, for the real‐life application, it is crucial to recognize the functional reliability of wearable textile electronics. This review comprehensively summarizes the recent progress in electronic textiles (e‐textiles) using different electroactive materials and textile architectures for numerous wearable applications. The first section highlights different textile architectures used in e‐textiles and their various properties. Various electroactive polymers from carbon, metal, and conductive polymers, including their electromechanical properties and wash durability, are then discussed. Subsequently, progress in textile‐based energy harvesting and storage, personal thermal management, flexible sensing, electrocardiography (ECG), electromagnetic interference shielding are presented. Finally, the remaining challenges regarding the current materials and processing strategies are pointed out, and practical strategies to fully realize e‐textile systems are suggested.

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Enzymatically produced cellulose nanocrystals as reinforcement for waterborne polyurethane and its applications

Cited by 37 publications

References 57 publications

Preparation and Characterization of Cellulose Nanofibril-Waterborne Polyurethane Composite Films

Preparation and Characterization of Cellulose Nanofibril-Waterborne Polyurethane Composite Films

Nanocelluloses Reinforced Bio-Waterborne Polyurethane

Mapping the Progress in Flexible Electrodes for Wearable Electronic Textiles: Materials, Durability, and Applications

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