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Starch- polyvinyl alcohol crosslinked film— performance and biodegradation
Authors:Liang Chen  Syed H. Imam  Sherald H. Gordon  Richard V. Greene
Affiliation:(1) Biopolymer Research Unit, National Center for Agricultural Utili- zation Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, 61604 Peoria, Illinois
Abstract:Starch-PVOH cast films were prepared with and without crosslinking agent (hexamethoxymethylmelamine) in the absence of plasticizer. Moisture absorption in films without crosslinking agent at a low relative humidity was similar to that of PVOH and increased as the relative humidity increased. Films with crosslinking agent showed moisture absorption linearly proportional to the relative humidity. Significant improvement in resistance to water disintegration for crosslinked starch-PVOH films was observed. While the tensile strength decreased with increased relative humidity, crosslinking significantly improved the tensile strength. Increased PVOH content improved elongation of films even when the relative humidity was 80% or higher. Biodegradation studies revealed that the degradation rate was negatively correlated with the PVOH content in films and crosslinking generated more converged degradation curves. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also be suitable.
Keywords:Starch  polyvinyl alcohol  film  crosslinking  hexamethoxymethylmelamine  biodegradation  respirometer  water resistance
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