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United States Department of Agriculture

Agricultural Research Service

Research Project: NOVEL STARCH-BASED MATERIALS

Location: Plant Polymer Research

Title: Structure-function properties of starch spherulites grafted with poly(methyl acrylate)

Authors
item Finkenstadt, Victoria
item Selling, Gordon
item Felker, Frederick
item Fanta, George

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: April 10, 2014
Publication Date: May 24, 2014
Citation: Finkenstadt, V.L., Selling, G.W., Felker, F.C., Fanta, G.F. 2014. Structure-function properties of starch spherulites grafted with poly(methyl acrylate). Meeting Abstract.

Technical Abstract: Spherulites, produced by steam jet-cooking high-amylose starch and oleic acid, were grafted with methyl acrylate, both before and after removal of un-complexed amylopectin. For comparison, granular high-amylose corn starch was graft polymerized in a similar manner. The amount of grafted and ungrafted poly(methyl acrylate) were similar for all starch-graft-poly(methyl acrylate) copolymers. Graft content was ~55%. Although extruded ribbons with similar tensile strength (~17 MPa) were obtained from the three starch-PMA graft copolymers, much higher values for elongation were obtained from the spherulite-containing copolymers increasing from 200% to 600% as spherulite content increased. The graft frequency and molecular weights of grafted poly(methyl acrylate) showed an interesting correlation to the tensile elongation of the extruded sample.

Last Modified: 9/20/2014
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