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Effect of domain size and interface characteristics on the impact resistance of selected polymer composites

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TypeOfResource
Text
TitleInfo (ID = T-1)
Title
Effect of domain size and interface characteristics on the impact resistance of selected polymer composites
SubTitle
PartName
PartNumber
NonSort
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ETD_2404
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000052162
Language (objectPart = )
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eng
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theses
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Topic
Materials Science and Engineering
Subject (ID = SBJ-2); (authority = ETD-LCSH)
Topic
Composite materials
Subject (ID = SBJ-3); (authority = ETD-LCSH)
Topic
Polymers
Abstract
Nanocomposite technology has advanced considerably in recent years and excellent engineering properties have been achieved in numerous systems. In multiphase materials the enhancement of properties relies heavily on the nature at the interphase region between polymer domains and nanoparticle reinforcements. Strong adhesion between the phases provides excellent load-transfer and good mechanical elastic modulus and strength, whereas weak interaction contributes to crack deflection mechanisms and toughness. Polymer molecules are large and the presence of comparably sized filler particles affects chain gyration, which in turn influences the conformation of the polymer and the properties of the composite.
Nanoparticles were incorporated into a poly(methyl methacrylate) matrix by means of in situ free radical (bulk) polymerization. Aluminum oxide and zinc oxide nanoparticles were added to study the effects of particle chemistry and shape on selected mechanical properties such as impact resistance, which showed significant improvement at a certain loading of zinc oxide. The elongated shape of zinc oxide particles appears to promote crack deflection processes and to introduce a pull-out mechanism similar to that observed in fiber composite systems. Moreover, the thermal stability of PMMA was improved with the addition of nanoparticles, apparently by steric hindrance of polymer chain motion and a second mechanism related to the dipole inducing effect of the oxide particles. The sensitivity of infrared spectroscopy to changes in molecular dipoles was used to study the nature of the polymer/particle interface. The results revealed some interesting aspects of the secondary bonds between polymers and oxides. Raman spectroscopy was used to investigate the extent of polymerization and changes in polymer conformation. A degree of polymerization of 93% was achieved in neat PMMA, and even when 5.0 v/o of PGMEA was introduced into the system no monomer was detected. However, when nanoparticles were included in the system, the ability of these surfaces to absorb active species reduced the degree of polymerization to about 87%. Furthermore, the syndiotactic sequence increases with the addition of nanoparticles as a consequence of enhanced accessibility to both the metal oxide surface and the dispersing solvent within the system.
PhysicalDescription
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electronic resource
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xvi, 119 p. : ill.
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Ph.D.
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Includes bibliographical references
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by Wantinee Viratyaporn
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Viratyaporn
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Wantinee
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1982-
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author
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Wantinee Viratyaporn
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Lehman
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Richard
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chair
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Advisory Committee
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Richard L. Lehman
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Birnie
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Dunbar
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internal member
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Advisory Committee
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Dunbar P Birnie
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Chhowalla
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Manish
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Advisory Committee
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Manish Chhowalla
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Mann
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Adrian
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Adrian Mann
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Skandan
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Ganesh
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Ganesh Skandan
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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school
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2010
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2010-01
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xx
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Rutgers University Electronic Theses and Dissertations
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ETD
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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NjNbRU
Identifier (type = doi)
doi:10.7282/T34M94Q1
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

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The author owns the copyright to this work.
Copyright
Status
Copyright protected
Notice
Note
Availability
Status
Open
Reason
Permission or license
Note
RightsHolder (ID = PRH-1); (type = personal)
Name
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Viratyaporn
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Wantinee
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2010-01-05 18:28:39
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Wantinee Viratyaporn
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Rutgers University. Graduate School - New Brunswick
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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