Effects of hydrophobation treatments of wood particles with an amino alkylsiloxane co-oligomer on properties of the ensuing polypropylene composites

2013 | journal article. A publication with affiliation to the University of Göttingen.

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​Effects of hydrophobation treatments of wood particles with an amino alkylsiloxane co-oligomer on properties of the ensuing polypropylene composites​
Xie, Y.; Krause, A.; Militz, H.; Steuernagel, L. & Mai, C.​ (2013) 
Composites Part A Applied Science and Manufacturing44 pp. 32​-39​.​ DOI: https://doi.org/10.1016/j.compositesa.2012.08.011 

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Authors
Xie, Yanjun; Krause, Andreas; Militz, Holger; Steuernagel, Leif; Mai, Carsten
Abstract
In this study an amino alkylsiloxane co-oligomer was used to treat the wood particles to weight percent gains of 1.5%, 4.5%, and 7.0%, respectively, and coupling effects on the properties of the ensuing wood polypropylene composites were determined. The n-propyl-trimethoxysilane (alkylsilane) and 3-amino-propyltriethoxysilane (aminosilane) were also used for comparison. Compared to composites filled with untreated particles, composites treated with co-oligomer exhibited greater reduction in both the rates of water uptake and dimensional swelling than those treated with the other two silanes. Both, the flexural- and Charpy impact strengths of the composites, were moderately reduced but the tensile strength increased up to 23% due to treatment with the co-oligomer. The different effects by the silanes were also evidenced by dynamic mechanical analysis and microscopy. These results show that use of the co-oligomer can create a highly hydrophobic composite and any improvement in the mechanical properties is comparable to that with aminosilane. (C) 2012 Elsevier Ltd. All rights reserved.
Issue Date
2013
Journal
Composites Part A Applied Science and Manufacturing 
Organization
Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Holzbiologie und Holzprodukte 
ISSN
1359-835X

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