Shear thickening fluid containment in polymer composites

• US 20060234572A1
• Filed: 10/27/2005
• Published: 10/19/2006
• Est. Priority Date: 10/27/2004
• Status: Abandoned Application

• Current Assignee: University of Delaware
• Original Assignee: UD Technology Corporation
• Inventors: Egres, Ronald G. Jr., Kirkwood, John E., Wagner, Norman
• Application Number:
  US11/260,742
• Publication Number:
  US 20060234572A1
• Time in Patent Office: Days
• US Class Current: 442/59
• CPC Class Codes: C08G 2101/00 Manufacture of cellular products
• CPC Class Codes: C08G 2110/0058 ≥50 and <150kg/m3
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: Y10T 442/20 Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer

Abstract

The rheology of a colloidal PEG-based shear thickening fluid emulsified with silicone oil is studied in detail. A shear thickening response is observed in the viscosity-shear rate curves for volume fractions as low as 10% of STF in the silicone emulsion. From the log additivity rule, we prove the system to be classified as both a positive and negative deviating blend at zero shear. This interesting behavior is due to phase inversion. The rubbers are formed by emulsifying the shear thickening fluid within the rubber precursors and then adding the catalyzing agent. It was possible to contain STF in each of the silicones tested and the rubbers exhibited different behavior with incased STF. Shear thickening fluid was added to open cell polyurethane to create a Foam-STF composite which was found to exhibit an obvious shear thickening response. The foam composite became solid like and absorbed energy at high strains while still maintaining its fluid-like response at low strain rates.

Claims

1. A composite which comprises a solid material and a shear thickening fluid wherein said shear thickening fluid is impregnated into a porous solid scaffold material.