Synthesis Of Bio-Degradable Copolymers from Sodium Alginate and Konjac Glucomannan Via Dehydration and Ca2+ Cross-Linking

Abstract

The study aimed to develop bio-degradable, grafted copolymers using sodium alginate and Konjac-glucomannan. Sodium alginate, extracted from seaweed, and Konjac-glucomannan, derived from the Konjac plant, form a brown, viscous paste in pH 4.0-7.0 liquids. Sodium alginate is known for its solubility, stability, and viscosity. The research involved mixing different ratios of sodium alginate and Konjac-glucomannan with water and glycerol as a compatibilizer. These combinations were used to create various colloid-polymer pastes, and their properties were assessed. Glycerol played a vital role in enhancing performance and compatibility. Two processing methods were employed. The first method involved immersing the pastes in a calcium chloride solution, enabling cross-linking through Ca^2+ ions. This formed films with distinct properties, including strength, brittleness, elasticity, and solubility. The second method involved dehydration, drying the pastes to form films with different properties than the cross-linked films. The resulting films exhibited diverse characteristics depending on the ratios of sodium alginate and Konjac-glucomannan. Cross-linked films demonstrated varying levels of strength, brittleness, elasticity, and solubility due to the network structure formed during cross-linking. Dehydrated films, obtained by removing water molecules, exhibited unique properties. This study contributes to the field of bio-degradable copolymers by successfully developing grafted copolymers using sodium alginate and Konjac-glucomannan. These natural polymers hold promise for sustainable materials in applications like packaging, drug delivery, and biomedical engineering. Further research is necessary to optimize copolymer compositions and processing techniques in order to fully harness their potential. Understanding the structure-property relationships will enable the customization of copolymers for specific applications, advancing the development of eco-friendly materials for a greener future.