Biocomposites based on plasticized starch: thermal and mechanical behaviours

被引:385
作者
Averous, L
Boquillon, N
机构
[1] ULP, ECPM, LIPHT, F-67087 Strasbourg 2, France
[2] ARD, Agro Ind Res & Dev, F-51110 Pomacle, France
关键词
composite; plasticized starch; cellulose fibres; mechanical properties;
D O I
10.1016/j.carbpol.2003.11.015
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The paper is focusses on the study of the thermal and mechanical behaviour of reinforced agro-materials. Various formulations based on plasticized starch matrix have been carried out, varying matrix formulation, filler content, fibres length and nature. Cellulose and lignocellulose fibres, which show unequal surface tensions, have been tested. After extrusion and injection moulding, the properties of these wheat starch-based biocomposites are analysed. Mechanical properties (tensile tests), thermo-mechanical properties (DMTA) and thermal degradation (TGA) are analysed. DMTA analysis shows important variations of main relaxation temperature, which can be linked both, to interactions resulting in a decrease of starch chain mobility and to a regular reinforcing effect. These results are consistent with the static mechanical behaviour, which vary according to the filler content (up to 30 wt%), fibre nature (cellulose vs. lignocellulose) and fibre length (from 60 mum to 1 mum). Besides, we have shown that the addition of cellulose fillers improves the thermal resistance of these biocomposites. Finally, we have tested the impact of the addition of biodegradable polyesters into these composites without significant effect on the post-processing stability. (C) 2004 Elsevier Ltd. All rights reserved.
引用
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页码:111 / 122
页数:12
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