Journal
CARBOHYDRATE POLYMERS
Volume 101, Issue -, Pages 163-170Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.09.023
Keywords
Natural fibres; Water sorption; Fourier transformed infrared spectroscopy; Partial least square regression; Diffusion kinetics
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In the field of composite materials, natural fibres appear to be a viable replacement for glass fibres. However, in humid conditions, strong hydrophilic behaviour of such materials can lead to their structural modification. Then, understanding moisture sorption mechanisms in these materials is an important issue for their efficient use. In this work, the water sorption on three natural fibres (flax, hemp and sisal) was studied using Fourier transformed infrared spectroscopy. The spectral information allowed both qualitative and quantitative analyses of the moisture absorption mechanisms. The main chemical functions involved in the water sorption phenomenon were identified. The absolute water content of the fibres was also determined by using a partial least square regression (PLS-R) approach. Moreover, typical sorption isotherm curves described by Park model were fitted as well as water diffusion kinetics. These last applications confirmed the validity of the FTIR spectra based predictive models. (C) 2013 Elsevier Ltd. All rights reserved.
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