Fatty Acid‐Based Waterborne Coatings

Moreno, Mónica; Goikoetxea, Monika; Barandiaran, Marı́a J.

doi:10.1002/9781119185055.ch7

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…Bio-based WBPUs are also prepared with this technique, and vegetable oils have shown to be a particularly attractive source for the preparation of polyols. These polyols are obtained via the chemical modification of oil or from the preparation of monomers from which the polyols are synthesized [ 4 , 10 , 11 ]. In few cases, vegetable oil can be used directly as a polyol, which is the case of castor oil (CO) that has hydroxyl groups in esterified ricinoleic acid chains [ 4 ].…”

Section: Introductionmentioning

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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