Xyloglucan modification using controlled polymer grafting for biocomposite applications
نویسنده
چکیده
The increased environmental consciousness has raised a discussion about saving natural resources, which has led to an emerging interest in the development of sustainable materials with high performance. Polysaccharide biopolymers from renewable resources, for instance, are a great alternative to replace oil-based polymers since they have a lower cradle to grave energy use and greenhouse gas emissions than synthetic polymers. The biopolymer starch, for instance, is widely used in the packaging industry. However, it has some drawbacks : it is obtained from food resources (such as potatoes or corn) and is highly sensitive to humidity. Tamarind seed xyloglucan has recently been investigated as a new interesting non-food high-performance biopolymer for packaging applications. It could also be used as a matrix for cellulose fiber-reinforced biocomposites, since its affinity with cellulose is very strong. Nevertheless, its glass transition temperature is very high (about 260°C) and close to the degradation temperature; therefore it needs to be lowered to facilitate the processing of biocomposite matrices, for instance. In this study, the grafting of poly(L-lactide) from xyloglucan via ring-opening polymerization of L-lactide was carried out. The effect of parameters such as the length of the grafted chains or the nature of the substrate was investigated. Various characterization techniques were used to evaluate the product’s thermomechanical properties.
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