Composites of starch and poly (ethylene-co-acrylic acid). Complexing between polymeric components

Extrusion-blown film prepared from a semidry mixture of starch and poly(ethylene-co-acrylic acid) (EAA) cannot be sharply separated into its polymeric components by selective solvent extraction, and the two polymers have the outward appearance of being compatible. Also, the starch portion is resista...

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Bibliographic Details
Published in:Journal of applied polymer science 1990-09, Vol.40 (5/6), p.811-821
Main Authors: Fanta, G.F. (USDA, ARS, Northern Regional Research Center, Peoria, IL), Swanson, C.L, Doane, W.M
Format: Article
Language:English
Subjects:
ALMIDON
AMIDON
Analysis and structure
Applied sciences
Exact sciences and technology
EXTRUSION
POLIMEROS
Polymer industry, paints, wood
POLYMERE
Properties and testing
Technology of polymers
VISCOSIDAD
VISCOSITE
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Summary:Extrusion-blown film prepared from a semidry mixture of starch and poly(ethylene-co-acrylic acid) (EAA) cannot be sharply separated into its polymeric components by selective solvent extraction, and the two polymers have the outward appearance of being compatible. Also, the starch portion is resistant to enzyme attack, and starch domains are not visible by SEM. Further studies were therefore made on the starch-EAA system to determine reasons for the apparent compatibility between the two polymers, and evidence for polymer complex formation was obtained. Combination of aqueous ammonia solutions of starch and EAA led to an increase in viscosity, and a coprecipitate of starch and EAA separated from solution. Moreover, solvent extraction would not separate physical mixtures of starch and EAA prepared from aqueous solutions. Although both the linear (amylose) and branched (amylopectin) components of starch formed an apparent complex with EAA, a low molecular weight starch fraction and a high molecular weight dextran (a polysaccharide with alpha-(1 leads to 6) linked glucopyranosyl units) did not. These observations support the theory that a helical inclusion complex is formed from starch and EAA, which is similar to the well-known complexes produced from starch and fatty acids
ISSN:0021-8995
1097-4628
DOI:10.1002/app.1990.070400517