Mechanical Property and Biodegradability of Cast Films Prepared from Blends of Oppositely Charged Biopolymers

摘要: Biodegradable cast films of about 50 μm thickness were fabricated by blending oppositely charged biopolymers such as anionic starch–chitosan, and cationic starch–pectin. The tensile strength elongation at break (%) evaluated well their capacity to degrade in compost. Films recovered from soil every 48 h showed consistent degradation (weight loss), diminution the polymer’s characteristic peak absorbance carbohydrate fingerprint region FTIR, changes surface morphology via scanning electron microscopy (SEM). Anionic starch–chitosan had much superior compared starch–pectin, suggesting that ionic bonds formed between anionic-starch positively groups chitosan polymer more stable stronger. Initially, both lost 36% weight within 96 h, which also correlated with loss absorption peaks infrared spectrum typical biopolymers. total mineralization microorganisms compost was measured using respirometric techniques. Though rate differed for two formulations, (extent) achieved 45 days.