Preparation and properties of starch-based biopolymers modified with difunctional isocyanates

The present work reports on the preparation of thermoplastic starch (TPS) modified in situ with a diisocyanate derivative. Evidence of the condensation reaction between the hydroxyl groups of starch and glycerol with the isocyanate function (NCO) was confirmed by FTIR analysis. The evolution of the properties of the ensuing TPS, in term of mechanical properties, microstructure, and water sensitivity, was investigated using tensile mechanical, dynamic mechanical thermal analysis (DMTA), X-ray diffraction (XRD), and water uptake. The results showed that the addition of isocyanate did not affect the crystallinity of the TPS and slightly reduced the water uptake of the material. The evolution of the mechanical properties with ageing became less pronounced by the addition of the isocyanate as their amount exceeded 4 to 6wt%.

Academic Building Revenue Bond Funds, June 30, 2002

State University Audit Report

Dormitory and Dining Services Revenue Bond Funds, June 30, 2002

State University Audit Report of Iowa State University

Hilton Coliseum Revenue Bond Funds, June 30, 2002

State University Audit Report

Ice Arena Facility Revenue Note Funds, June 30, 2002

State University Audit Report

Parking System Revenue Bond Funds, June 30, 2002

State University Audit Report of Iowa State University

Recreational Facility Revenue Bond Funds, June 30, 2002

State University Audit Report of Iowa State University

Student Health Center Revenue Bond Funds, June 30, 2002

State University Audit Report of Iowa State University

Telecommunications Facilities Revenue Bond Funds, June 30, 2002

State University Audit Report

Utility System Revenue Bond Funds, June 30, 2002

State University Audit Report

Coordination of Transit and School Busing in Iowa, Final Report, December 2003

The 2003 Iowa General Assembly asked the Iowa Department of Transportation (Iowa DOT) to conduct a study of Iowa public policy regarding coordination of public transit services and school transportation. This report describes the efficiencies that may be obtained by coordinating transit management and maintenance systems in the areas of school transportation, public transit, and other forms of public transportation. The Center for Transportation Research and Education (CTRE) at Iowa State University studied these issues and prepared this report for the Iowa DOT.

Acreage Living, October-November, 2004

Acreage Living newsletter for those persons living on or interested in acreage living.

Acreage Living, December 2004-January 2005

Newsletter for those who reside on acreages

Designation of Co-benefits and Its Implication for Policy: Water Quality versus Carbon Sequestration in Agricultural Soils, March 2005

Designation of Co-benefits and Its Implication for Policy: Water Quality versus Carbon Sequestration in Agricultural Soils, The