Temperature dependence of the tensile properties of lignin/paper composites |
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Authors: | Shoichiro Yano Hyoe Hatakeyama Tatsuko Hatakeyama |
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Affiliation: | Industrial Products Research Institute, 1-1-4, Yatabe-Machi Higashi, Tsukuba-Gun, Ibaraki 305, Japan;Research Institute for Polymer and Textiles, 1-1-4, Yatabe-Machi Higashi, Tsukuba-Gun, Ibaraki 305, Japan |
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Abstract: | The mechanical properties of dioxane lignin (DL)/paper and kraft lignin (KL)/paper composites were investigated as functions of temperature and strain rate. The tensile properties of the lignin/paper composites were governed by the viscoelastic properties of lignins used as a matrix. In the temperature dependence of the tensile properties, the strength of DL/paper composite decreased at 70° and 130°C at which the elongation had maxima. This behaviour was caused by the viscoelastic properties of DL having two relaxations in the primary dispersion region at 120° and 160°C. In the case of KL/paper composite, a drastic decrease in the strength and maximum of elongation were observed at the glass transition of KL (140°C). The strain rate dependence of the strength of DL/paper composite showed behaviour typical of viscoelastic materials. The strength increased with increase of the strain rate and then decreased after reaching a maximum, which showed a transition from a brittle to a ductile type of fracture. |
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Keywords: | tensile properties viscoelasticity glass transition hydrogen bond lignin composite |
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