Type of Document Master's Thesis Author Owen, Christopher Cooper Author's Email Address firstname.lastname@example.org URN etd-05232006-141426 Title Magnetic Induction for In-situ Healing of Polymeric Material Degree Master of Science Department Mechanical Engineering Advisory Committee
Advisor Name Title Leo, Donald J. Committee Chair Inman, Daniel J. Committee Member Long, Timothy E. Committee Member Keywords
- polymer healing
- polymer induction heating
- self-healing polymer
Date of Defense 2006-05-19 Availability restricted AbstractThe field of self-healing materials is growing dramatically due to the obvious in-
centive of having structural materials with the ability to repair damage. Some polymers
have demonstrated the ability to heal from damage autonomously[12, 26], when exposed to
heat, or when punctured[5, 9]. The goal of this research is to develop a “proof-of-concept”
polymer composite that has the ability to heal when exposed to an alternating magnetic
Several types of magnetic particulate were inspected for use in the production of
polymer composite test samples. The types of particulate used in sample production were
two supplies of gamma-Fe2O3, one supply of alpha-Fe2O3, and one supply of Ni-Zn Ferrite. Surlyn 8940 was selected as the bulk polymer due to its self-healing qualities. A method for melt
mixing the particulate with the polymer in various volume fractions was developed and an
SEM was used to study the dispersion of the particulate.
Once the polymer composite samples were made, various tests were conducted to
characterize the samples in order to determine what effects the particulate had on the prop-
erties of the bulk polymer. These tests included differential scanning calorimetry (DSC),
rheology, conductivity, and magnetic response. Once the samples were characterized, tests
were performed to study the composite polymers ability to heat and heal. These tests
included healing microscopy, induction heating, and tensile testing.
From this study, it was found that the addition of particulate to the bulk polymer
does alter the properties by increasing viscosity and electrical conductivity. However, the
addition of particulate does not change the melt temperature, but allows the magnetic
hysteresis loop of each composite sample to be revealed through magnetic testing. Through
healing microscopy and tensile testing, the polymer composites were found to heal when
heated, but at a higher temperature than the pure bulk polymer samples. Each type of
polymer composite also heated to varying degrees through magnetic induction. Due to the
ability of the polymer composite to heal and heat, a “proof-of-concept” has been provided
for a magnetically healing polymer composite.
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