Effect of co-monomer ratio in ABS and wood content on processing and properties in wood/ABS composites
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Author list: Threepopnatkul P., Teppinta W., Sombatsompop N.
Publisher: Springer
Publication year: 2011
Journal: Fibers and Polymers (1229-9197)
Volume number: 12
Issue number: 8
Start page: 1007
End page: 1013
Number of pages: 7
ISSN: 1229-9197
eISSN: 1875-0052
Languages: English-Great Britain (EN-GB)
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Abstract
Acrylonitrile-Butadiene-Styrene copolymers (ABS) reinforced with wood flour were investigated for rheological, mechanical and thermal properties. Three grades of commercial ABS resin (high flow (HF-ABS), medium impact (MI-ABS) and super high impact (SI-ABS) grades) were characterized using H-NMR and elemental analysis for the determination of co-monomer content. Wood flour from Para rubber trees treated with N-2 (aminoethyl)-3-(aminopropyl) trimethoxy silane was blended with ABS in the melt blending process using a twin-screw extruder. Wood flour contents used in this work were 0. 0 %, 9. 1 %, and 33. 3 % wt. The composites with higher acrylonitrile contents showed higher melt viscosity especially at the low shear rate. Carreau's model was used for curve-fitting. The extrudate swell ratio of the composites tended to increase at the shear rate of 10-500 s-1 and then decreased dramatically once the shear rate were further applied. Neat ABS and wood/ABS composites with higher butadiene content illustrated a higher swelling ratio. The neat MI-ABS and composites showed the highest ultimate tensile strength and modulus due to the butadiene content effect. As the wood flour loading was increased, the tensile modulus of all ABS composites increased with the sacrifice of the tensile strength of composites. The elongation at break and impact strength were noticeably the highest for wood/SI-ABS composites among all because of the effect of rubbery butadiene content. Thermal stability of plastic in 9. 1 % wood in HF-ABS composites was improved compared with the neat HF-ABS due to the low acrylonitrile content. ฉ 2011 The Korean Fiber Society and Springer Netherlands.
Keywords
Mechanical properties, processing, Reinforcement, thermoplastics
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