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Thermal Conductivity and Coefficients of Thermal Expansion of SWNTs/Epoxy Nanocomposites

Title: Thermal Conductivity and Coefficients of Thermal Expansion of SWNTs/Epoxy Nanocomposites.
Name(s): Gonnet, Philippe, author
Liang, Zhiyong, professor directing thesis
Brooks, James, committee member
Wang, Ben, committee member
Zhang, Chuck, 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: 2004
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Since their discovery in 1991, carbon nanotubes have undergone intensive research. The single-walled carbon nanotube, or SWNT, has a unique electronic structure. According to their chirality, they can be either metallic or semiconductors with various band gaps. These different electronic structures influence their electrical and thermal properties. Studies have been conducted to understand, model and measure their electrical and thermal properties by computer simulation and experimental measurements. Even though current research shows inconsistent results, all studies show that SWNTs have phenomenal electrical and thermal properties. To take advantage of these unique properties of nanotubes requires properly incorporating SWNTs into a matrix as a reinforcement or filler to form nanocomposites with desired properties. Carbon nanotube reinforced composites are still under development. The mechanical properties of these materials have been intensively explored; however, the electrical and thermal properties still require further study. The main objective of this thesis was to measure and understand the thermal behavior of SWNT-reinforced composites. This thesis focuses on 1) the thermal conductivity of buckypapers (aligned or random SWNT network from filtration of well-dispersed nanotube suspension) and the nanocomposites produced from the buckypapers, and 2) the influence of nanotubes on thermal expansion by direct mixing and casting samples of SWNT/epoxy nanocomposites. Thermal conductivity was measured using a comparative method, with a constantan foil as a reference. The temperature dependence of the thermal conductivity was measured from 115 K to room temperature. Magnetically aligned buckypapers produced with 17.3 Tesla magnetic field showed the highest thermal conductivity at room temperature, with a maximum value of 41.5 W/mK in the aligned direction. The coefficient of thermal expansion (CTE) was measured using the Thermomechanical Analyzer (TMA). The influence of nanotube functionalization and loading on the CTE of the epoxies revealed that adding 1 wt% nanotubes in the epoxy resin could reduce the CTE of the resin as much as 35.5%. The mechanisms of thermal conductivity variation and CTE reduction in the buckypapers and nanocomposites are also discussed.
Identifier: FSU_migr_etd-4142 (IID)
Submitted Note: A Thesis submitted to the Department of Industrial Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Summer Semester, 2004.
Date of Defense: July 12, 2004.
Keywords: Carbon Nanotube, Buckypaper, Thermal Conductivity, CTE
Bibliography Note: Includes bibliographical references.
Advisory Committee: Zhiyong Liang, Professor Directing Thesis; James Brooks, Committee Member; Ben Wang, Committee Member; Chuck Zhang, Committee Member.
Subject(s): Industrial engineering
Manufacturing processes
Persistent Link to This Record:
Owner Institution: FSU

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Gonnet, P. (2004). Thermal Conductivity and Coefficients of Thermal Expansion of SWNTs/Epoxy Nanocomposites. Retrieved from