In situ generated silica reinforced polyvinyl alcohol/liquefied chitin biodegradable films for food packaging. (15th June 2020)

• Record Type: Journal Article
• Authors: Zhang, Jie; Xu, Wen-Rong; Zhang, Yu-Cang; Han, Xu-Dong; Chen, Chen; Chen, Ao
• Is Part Of: Carbohydrate polymers. Volume 238(2020)
• Publication Date: 2020-06-15
• Subjects: Polyethylene glycol (PubChem CID: 174) -- Glycerin (PubChem CID: 753) -- Polyvinyl alcohol (PubChem CID: 11199) -- Ethanol (PubChem CID: 702) -- Sulfuric acid (PubChem CID: 1118) -- KBr (PubChem CID: 253877) -- Na2SiO3 (PubChem CID: 23266); Chitin -- Liquefaction -- Polyvinyl alcohol -- Silica -- Biodegradable film; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116182
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Well-dispersed SiO2 was in situ synthesized via the hydrolysis of Na2 SiO3 in the presence of acid PVA/LBMC solution. In situ generated silica greatly improved the mechanical property of PVA/LBMC blend films. The optimized 4PVA-LBMC-0.2Si showed effective preservation performance. 4PVA-LBMC-0.2Si blend film exhibited good degradability after 30 days burial in soil. Abstract: In previous report, polyvinyl alcohol/liquefied ball-milled chitin (PVA/LBMC) blend films with good antibacterial activity were successfully prepared. To further develop a biodegradable food packaging material, various amounts of nano-silica were introduced in situ by the hydrolysis of Na2 SiO3 to give a series of silica-reinforced PVA/LBMC blend films. Their structure, morphology, mechanical and thermal properties, food preservation and degradation behavior in soil were comprehensively characterized. The results showed that when the content of Na2 SiO3 was 0.2 wt %, the blend film 4PVA-LBMC-0.2Si displayed the optimized performance. Its tensile strength, and the maximum weight loss rate temperature reached 51 MPa and 307 ℃, respectively, which were significantly improved than those of silica-free film. The preservation tests of cherries showed its good fresh keeping performance. Although the degradation rate of silica-reinforced blend films in the soil was slightly decreased, it remained at a good level of 43 % after 30 days of burial.