Starch- polyvinyl alcohol crosslinked film— performance and biodegradation |
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Authors: | Liang Chen Syed H Imam Sherald H Gordon Richard V Greene |
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Institution: | (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 |
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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. |
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Keywords: | Starch polyvinyl alcohol film crosslinking hexamethoxymethylmelamine biodegradation respirometer water resistance |
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