The Fracture Behavior and Mechanical Performance of Biodegradable Cornstarch Plastic Composites
Domingo, Bernadette Joy
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https://hdl.handle.net/2142/83741
Description
Title
The Fracture Behavior and Mechanical Performance of Biodegradable Cornstarch Plastic Composites
Author(s)
Domingo, Bernadette Joy
Issue Date
1999
Doctoral Committee Chair(s)
Scott A. Morris
Department of Study
Food Science and Human Nutrition
Discipline
Food Science and Human Nutrition
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Plastics Technology
Language
eng
Abstract
The principle of filler addition as a means of preventing crack initiation and propagation was demonstrated by the addition of cellulose and soy protein isolate (SPI) to a common cornstarch matrix. The effects of cellulose and SPI fillers as anti-crack agents in high-amylose starch plastics were not obvious, but the tensile strength and elastic modulus of the high-amylose cornstarch/cellulose composite were 8106 psi and 201 ksi, respectively, which are greater than those of polypropylene. Comparison of the materials' tensile strength, strain and total energy-to-break to the roughness of the fracture surfaces obtained by three-dimensional reconstruction revealed a relatively positive correlation, meaning that as the fracture surfaces appear rougher and more characteristically like ductile fractures, the stronger, more ductile and tougher the materials.
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