期刊
COMPOSITES PART B-ENGINEERING
卷 43, 期 7, 页码 2851-2860出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2012.04.049
关键词
Polymer-matrix composites (PMCs); Thermosetting resin; Fiber/matrix bond; Mechanical properties
资金
- FAPESP (The State of Sao Paulo Research Foundation, Brazil)
- CNPq (National Research Council, Brazil)
A tannin-phenolic resin (40 wt% of tannin, characterized by H-1 nuclear magnetic resonance (NMR) and C-13 NMR, Fourier transform infrared, thermogravimetry, differential scanning calorimetry) was used to prepare composites reinforced with sisal fibers (30-70 wt%). Inverse gas chromatography results showed that the sisal fibers and the tannin-phenolic thermoset have close values of the dispersive component and also have predominance of acid sites (acid character) at the surface, confirming the favoring of interaction between the sisal fibers and the tannin-phenolic matrix at the interface. The Izod impact strength increased up to 50 wt% of sisal fibers. This composite also showed high storage modulus, and the lower loss modulus, confirming its good fiber/matrix interface, also observed by SEM images. A composite with good properties was prepared from high content of raw material obtained from renewable sources (40 wt% of tannin substituted the phenol in the preparation of the matrix and 50 wt% of matrix was replaced by sisal fibers). (C) 2012 Elsevier Ltd. All rights reserved.
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