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Agricultural Research Service United States Department of Agriculture
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Research Project: Advanced Starch-Based Materials for Non-Food Applications

Location: Plant Polymer Research

Title: Comparison of Molecular Weight of Starch-Graft-Poly(acrylamide) Produced by Batch Reaction and Reactive Extrusion

Authors

Submitted to: Meeting Abstract
Publication Type: Abstract
Publication Acceptance Date: August 12, 2004
Publication Date: October 18, 2004
Citation: Parsons, J.D., Willett, J.L., Finkenstadt, V.L. 2004. Comparison of molecular weight of starch-graft-poly(acrylamide) produced by batch reaction and reactive extrusion [abstract]. American Chemical Society. p.196:435.

Technical Abstract: Free radical polymerization of acrylamide yields a bimodal molecular weight distribution for the homopolymer. Starch-graft-poly(acrylamide) shows the same behavior for grafted poly(acrylamide) chains. This distribution is seen in both batch reaction and reactive extrusion. Conversion of monomer for batch reaction was 45% with a grafting efficiency of 23% compared to 95% and 75%, respectively, for reactive extrusion. Compared to batch reactions which require more time and dilute solutions (2% total solids), reactive extrusion is more efficient with concentrated systems (50% total solids), fast grafting reactions and short residence times. Reactive extrusion allows continuous control of components such as initiator concentration, monomer ratios and starch feed rate. In addition, the combined effect of ingredient composition, mechanical and thermal energy allows for tuning of starch-graft-poly(acrylamide) composition and therefore its physical properties.

   

 
Project Team
Willett, Julious - J L
Momany, Frank
Finkenstadt, Victoria
Shogren, Randal - Randy
 
Publications
   Publications
 
Related National Programs
  Quality and Utilization of Agricultural Products (306)
 
Related Projects
   Determination of Structure-Property Relationships in Biological Macromolecules Using Biophysical Approaches
   Agricultural Polymers for Prevention of Corrosion on Metals
   Starch Foam Production by Extrusion
 
 
Last Modified: 05/13/2009
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