Journal
CARBOHYDRATE POLYMERS
Volume 184, Issue -, Pages 214-220Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.12.043
Keywords
Chitosan; PVA; Silica; In situ reinforcement; Food packages; Sodium metasilicate
Categories
Funding
- National Science Foundation of China [51372051, 51621091]
- State Key Laboratory of Urban Water Resource and Environment of Harbin Institute of Technology [2016TS03]
- HIT Environment and Ecology Innovation Special Funds [HSCJ201623]
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Non-degradable plastic food packages threaten the security of environment. The cost-effective and biodegradable polymer films with good mechanical properties and low permeability are very important for food packages. Among of biodegradable polymers, PVA/chitosan (CS) biodegradable films have attracted considerable attention because of feasible film forming ability. However, PVA/CS biodegradable films suffered from poor mechanical properties. To improve mechanical properties of PVA/CS biodegradable films, we developed SiO2 in situ to enhance PVA/CS biodegradable films via hydrolysis of sodium metasilicate in presence of PVA and chitosan solution. The tensile strength of PVA/CS biodegradable films was improved 45% when 0.6 wt.% SiO2 was incorporated into the films. Weight loss of PVA/CS biodegradable films was 60% after 30 days in the soil. The permeability of oxygen and moisture of PVA/CS biodegradable films was reduced by 25.6% and 10.2%, respectively. SiO2 in situ enhanced PVA/CS biodegradable films possessed not only excellent mechanical properties, but also barrier of oxygen and water for food packages to extend the perseveration time.
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