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Hydrophobization of Kraft-type Cellulose and Microfiber Cellulose Obtained from Soybean Husk in Ultrasonic Field

[ Vol. 13 , Issue. 2 ]

Author(s):

Blanca I. Montes Mejia, Oxana V. Kharissova and Boris I. Kharisov*   Pages 151 - 159 ( 9 )

Abstract:


Background: The addition of nanoparticles to cellulose paper can improve its mechanical strength, chemical stability, biocompatibility and hydrophobic properties. Silica nanoparticles are known to be inert, hydrophobic, biocompatible, biodegradable and have a good distribution in being deposited on surfaces. The main characteristics of 20 nm SiO2 nanoparticles are good chemical and thermal stability with a melting point of 1610-1728°C, a boiling point of 2230°C with a purity of 99.5%.

Objective: To carry out the hydrophobization of paper based on Kraft cellulose and on cellulose obtained from soybean husk with 20-nm size SiO2 nanoparticles and to study hydrophobicity, morphology and topography of the prepared composites.

Methods: The ground and roasted soybean husk was treated with a NaOH, washed and dried. Hydrophobization of paper was carried in aqueous medium by SiO2 addition in weight ratios “paper-SiO2” of 0.01-0.05 wt.%, stirring, filtration and drying. The obtained cellulose sheet composites were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), FTIRspectroscopy, Mullen proofs of hydrophobicity, and contact angle measurements.

Results: The mechanical properties of paper nanocomposites (tensile strength and compression) increased considerably by varying the concentrations. The tensile strength increased by 41-46% and the compressive strength increased by 55-56%. The existence of fiber nanofoils, good adhesion of 20-nm SiO2 nanoparticles to the paper surface, and their homogeneous distribution were observed.

Conclusion: Cellulose was successfully obtained from soybean husk, applying the alkaline-based extraction method. A good reinforcement of cellulose fibers is observed due to the outstanding characteristics of the silicon dioxide nanoparticles.

Keywords:

Soybean husk, cellulose, Kraft paper, silica nanoparticles, hydrophobization, microfibers.

Affiliation:

Universidad Autónoma de Nuevo León, Ave. Universidad s/n, San Nicolás de los Garza, Nuevo León, C.P. 66455, Universidad Autónoma de Nuevo León, Ave. Universidad s/n, San Nicolás de los Garza, Nuevo León, C.P. 66455, Universidad Autónoma de Nuevo León, Ave. Universidad s/n, San Nicolás de los Garza, Nuevo León, C.P. 66455



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