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Pmma Carbon Nanotube Nanocomposite Foams for Energy Dissipation Applications

Title: Pmma Carbon Nanotube Nanocomposite Foams for Energy Dissipation Applications.
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Name(s): Kynard, Kristin, author
Zeng, Changchun, professor directing thesis
Okoli, Okenwa, committee member
Vanli, Arda, committee member
Department of Industrial and Manufacturing Engineering, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2011
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Nanomaterials have attracted a great deal of research efforts due to the potential unprecedented properties these materials may provide. Carbon nanotubes (CNTs) are of particular interest because of their exceptional mechanical, thermal and electrical properties. The purpose of this research is to develop poly (methyl methacrylate) (PMMA) carbon nanotubes (CNTs) nanocomposite foams with improved energy dissipation capabilities (toughness). PMMA CNTs nanocomposites were first synthesized by anti-solvent precipitation process (ASP). Nanocomposites with different CNTs concentrations were prepared. The dispersion of the CNTs in the polymer matrix was observed by scanning electron microscopy (SEM). Nanocomposite foams were prepared by a batch process using carbon dioxide as the foaming agent. The foaming was conducted from the retrograde phase that enabled high CO2 solubility and facilitated formation of foams of high bubble density and small bubble size. The effects of foaming temperature, foaming time and CNTs concentration on the foam expansion ratio was investigated. The morphology of the prepared foams was studied by SEM. The compressive properties of the foams were measured and toughness determined. The nanocomposite foams with 0.5% CNT show improvement in energy absorbing capabilities. Upon further increasing CNT concentration, the capability decreases. Further analysis revealed that this was due to the non-uniform foam morphology in those nanocomposite foams. This in turn resulted in from the mixed nucleation mechanisms because of the insufficient CNT dispersion when foamed from the retrograde phase. Enhancement of CNT dispersion in the matrix is needed in order to improve the uniformity of the foams and realize the potential of these materials.
Identifier: FSU_migr_etd-3037 (IID)
Submitted Note: A Thesis submitted to the Department of Industrial and Manufacturing Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Summer Semester, 2011.
Date of Defense: June 30, 2011.
Keywords: PMMA Nanocomposite Foams, Compressive Properties, Energy Absorbtion, Multi-walled Carbon Nanotubes
Bibliography Note: Includes bibliographical references.
Advisory Committee: Changchun Zeng, Professor Directing Thesis; Okenwa Okoli, Committee Member; Arda Vanli, Committee Member.
Subject(s): Industrial engineering
Manufacturing processes
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-3037
Owner Institution: FSU

Choose the citation style.
Kynard, K. (2011). Pmma Carbon Nanotube Nanocomposite Foams for Energy Dissipation Applications. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-3037