Abstract
Polysaccharides are promising renewable alternatives to petroleum-based plastics, and are high-value-added materials in various industries. In this work, we synthesized dextran (α-1,6-glucan) ester derivatives substituting acyl groups with different carbon numbers from acetate to laurate. We found that the thermal stability of dextran was improved by esterification. Moreover, using differential scanning calorimetry and X-ray diffraction, we revealed that dextran ester derivatives were amorphous. Self-standing, transparent, solvent-cast films of dextran ester derivatives were prepared. Dextran ester derivatives adhered to various materials, including polyvinyl alcohol (PVA) films, wood, glass, and aluminum. In addition, the adhesive interfaces were transparent, which is important for practical applications. The adhesive strength for PVA films increased with concentration, exceeding the breaking strength of the PVA film at 0.3 g/mL. Moreover, dextran valerate and dextran hexanoate behaved as hot-melt-type adhesives. These results demonstrate the potential of dextran ester derivatives as biomass-based adhesives.
Highlights
Adhesives are an important type of polymer in industries ranging from electronics to construction
A variety of synthetic adhesives, such as polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), and polyurethane, are used in industrial products, they are mainly derived from petrochemical resources
Casein [1] and soy protein [2] have been applied as protein-based adhesives for particle boards, and starch [3], chitosan [4, 5], and glucomannan [4] have been for particle boards and in wood products
Summary
Adhesives are an important type of polymer in industries ranging from electronics to construction. A variety of synthetic adhesives, such as polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), and polyurethane, are used in industrial products, they are mainly derived from petrochemical resources. It is necessary to develop bio-based adhesives from renewable resources. Protein and polysaccharides are representative materials for bio-based adhesives. Casein [1] and soy protein [2] have been applied as protein-based adhesives for particle boards, and starch [3], chitosan [4, 5], and glucomannan [4] have been for particle boards and in wood products. Polysaccharide adhesives have good adhesion to wood and wood products owing to their polar functional groups, such as hydroxyl groups.
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