Thesis
Dielectric sensitivity to wear and thermal processes on carbon nanofiber/high density polyethylene composites
Washington State University
Master of Science (MS), Washington State University
2011
Handle:
https://hdl.handle.net/2376/101644
Abstract
With the addition of appropriate nanofillers, nanocomposites have been shown to be an effective way to achieve a multitude of enhanced properties, even extending to multi-functionalities not normally considered possible for conventional polymeric materials. In this investigation, the research on how wear and thermal processes affect nanocomposites was conducted. The research proposes the possibility of determining the effects of wear and thermal processes on the carbon nanofibers (untreated and orgaosilane treated) reinforced high density polyethylene nanocomposites by detecting dielectric signals over the lifetime of polymeric materials. Correlations that exist between effects of wear or thermal processes and dielectric properties of the nanocomposites are developed in this thesis. The experimental results reveal that the organosilane treated carbon nanofibers contributed to the significant enhancement of wear and thermal performances of high-density polyethylene / carbon nanofibers system. For wear properties, silanized CNF composites with the thick coating exhibited high wear resistance. During the wear process, there exist approximate linear relationships of dielectric constant versus wear coefficient for the nanocomposites. The change in dielectric constants is more sensitive to the increased wear coefficient for the composite materials with lower wear resistance. For thermal property, organosilane modified carbon nanofiber composites have less influence by the heating treatments displaying better thermal resistance. The change rates of dielectric constant and AC conductivity have higher sensitivity to the treatment at a higher temperature. This investigation provides potential for further research on application of dielectric signals to detect the effects of wear and heating process of composite materials.
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Details
- Title
- Dielectric sensitivity to wear and thermal processes on carbon nanofiber/high density polyethylene composites
- Creators
- Tian Liu
- Contributors
- Weihong Zhong (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525177901842
- Language
- English
- Resource Type
- Thesis