Influence of Alkaline Hornification Treatment Cycles on the Mechanical Behavior in Curaua Fibers

A well‐known treatment applied in vegetable fibers in both paper and cellulose industry is named hornification. This treatment consists in soaking and drying cycles aiming promoting a reducing in the water absorption capability of the fibers, which causes a stiffening in the cellulosic structure inc...

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Bibliographic Details
Published in:Macromolecular symposia. 2018-10, Vol.381 (1), p.n/a
Main Authors: Santos, Renata. D., Ferreira, Saulo R., Oliveira, Geiza E., Silva, Flavio A., Souza, Fernando G., Toledo Filho, Romildo D.
Format: Article
Language:English
Subjects:
alkaline hornification
Calcium hydroxide
Cellulose
Cellulose fibers
curaua fibers
Dimensional stability
Drying
Fibers
Fourier analysis
Mechanical properties
Organic chemistry
Slaked lime
Soaking
soaking and drying cycles
Stiffening
tensile strength
Tensile tests
Thermogravimetry
Vegetable fibers
Water absorption
X-ray diffraction
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Summary:A well‐known treatment applied in vegetable fibers in both paper and cellulose industry is named hornification. This treatment consists in soaking and drying cycles aiming promoting a reducing in the water absorption capability of the fibers, which causes a stiffening in the cellulosic structure increasing the dimensional stability and consequently their mechanical properties. In this work is presented an analysis of the effect of alkaline hornification, using a calcium hydroxide (CH) 0.7% w/v solution, after 01, 05, and 10 cycles of soaking and drying on the structure changes, mechanical answer, durability performance, and adherence behavior of curaua fibers in the cementitious matrix. The fiber structure as well as their physical and chemical characteristics are evaluated before and after hornification treatment by X‐ray diffraction (DRX), Thermogravimetry (TGA), Fourier Transformade Infrared (FTIR), and Scanning Electronic Microscope (SEM), while their mechanical answer is evaluated by direct tensile tests. The obtained results indicate that the hornification treatment alters the morphological, physical, and chemical fiber properties, improving their mechanical properties. However, when the number of cycles is excessive, this kind of treatment may cause a decreasing in fiber mechanical properties.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.201800096