Effects of Surface Modifications of Kraft Wood Pulp Cellulose Fibres on Improving the Mechanical Properties of Cellulose Fibre/Latex Composites

In this work, three composites with different contents (5, 10, and 15% w/w) of kraft pulp fibre were produced as reinforcing elements for natural latex matrix and the mechanical properties were evaluated. In order to improve the interfacial adhesion between the matrix and the reinforcing element, ch...

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Bibliographic Details
Published in:Journal of polymers and the environment 2019-11, Vol.27 (11), p.2445-2453
Main Authors: Prado, Natália Soares, da Silva, Ingrid Souza Vieira, de Morais, Luís Carlos, Pasquini, Daniel, Otaguro, Harumi
Format: Article
Language:English
Subjects:
Absorption spectra
Adhesion tests
BENZOYL RADICALS
Carbonyl compounds
CARBONYLS
CELLULOSE
Cellulose fibers
Chemical modification
Chemistry
Chemistry and Materials Science
CHLORIDES
Composite materials
Dispersion
Environmental Chemistry
Environmental Engineering/Biotechnology
ESTERS
FIBERS
FOURIER TRANSFORM SPECTROMETERS
Hydrophobicity
HYDROXIDES
Industrial Chemistry/Chemical Engineering
INFRARED SPECTRA
Kraft pulp
LATEX
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Organic chemistry
Original Paper
Polymer Sciences
Pulp
SCANNING ELECTRON MICROSCOPY
SLURRIES
SPECTROPHOTOMETERS
Spectroscopy
Storage modulus
SURFACE ENERGY
Surface properties
Thermal properties
Thermodynamic properties
Wood
Wood pulp
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Summary:In this work, three composites with different contents (5, 10, and 15% w/w) of kraft pulp fibre were produced as reinforcing elements for natural latex matrix and the mechanical properties were evaluated. In order to improve the interfacial adhesion between the matrix and the reinforcing element, chemical modifications were carried out on the surface of the fibres using octanoyl and benzoyl chlorides as modifying agents. The extension of chemical modification of the fibres was visualized by the presence of absorption bands in the spectroscopy analyzes of the modified fibre in relation to the crude fibre (ester carbonyl 1700–1740 cm −1 ); in addition, the hydroxyl band was preserved, which indicates a modification of surface character. The modified fibres became more hydrophobic due to the decrease in surface energy and the change in the dispersive and polar components. An increase in the storage modulus was observed for the composites with surface-modified fibres, which agrees with the improved dispersion between the surface-modified fibres and the matrix verified by means of scanning electron microscopy images. The incorporation of fibres did not cause changes in the thermal properties of the composites.
ISSN:1566-2543
1572-8919
DOI:10.1007/s10924-019-01516-w