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1

Department of Material Engineering-Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, Vysokoskolska 4, Kosice 042 00, Slovakia

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Department of Chemistry and Chemical Technologies, Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 2117-24, Zvolen 960 53, Slovakia





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Academic Editor: Daolun Chen

Abstract In this paper, water sorption behavior of 28 days hardened composites based on hemp hurds and inorganic binder was studied. Two kinds of absorption tests on dried cube specimens in deionized water bath at laboratory temperature were performed. Short-term after one hour water immersion and long-term up to 180 days water absorption tests were carried out to study their durability. Short-term water sorption behavior of original hemp hurds composites depends on mean particle length of hemp and on binder nature. The comparative study of long-term water sorption behavior of composites reinforced with original and chemically modified hemp hurds in three reagents confirmed that surface treatment of filler influences sorption process. Based on evaluation of sorption curves using a model for composites based on natural fibers, diffusion of water molecules in composite reinforced with original and chemically modified hemp hurds is anomalous in terms of the Fickian behavior. The most significant decrease in hydrophility of hemp hurds was found in case of hemp hurds modified by NaOH and it relates to change in the chemical composition of hemp hurds, especially to a decrease in average degree of cellulose polymerization as well as hemicellulose content. View Full-Text

Keywords: hemp hurds; chemical modification; composites; water absorption behavior; sorption kinetics hemp hurds; chemical modification; composites; water absorption behavior; sorption kinetics





Autor: Nadezda Stevulova 1, Julia Cigasova 1,* , Pavol Purcz 1, Ivana Schwarzova 1, Frantisek Kacik 2 and Anton Geffert 2

Fuente: http://mdpi.com/



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