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Development and evaluation of novel coupling agents for kenaf-fiber-reinforced unsaturated polyester composites

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dc.contributor.advisor Li, Kaichang
dc.creator Ren, Xiaofeng
dc.date.accessioned 2012-07-06T20:14:36Z
dc.date.available 2012-07-06T20:14:36Z
dc.date.copyright 2012-06-11
dc.date.issued 2012-06-11
dc.identifier.uri http://hdl.handle.net/1957/30754
dc.description Graduation date: 2013 en_US
dc.description.abstract Natural fibers are gaining popularity as reinforcement materials for thermoset resins over the last two decades. Natural fibers are inexpensive, abundant, renewable and environmentally friendly. Kenaf fibers are one of the natural fibers that can potentially be used for reinforcing unsaturated polyester (UPE). As a polymer matrix, UPE enjoys a 40% market share of all the thermoset composites. This widespread application is due to many favorable characteristics including low cost, ease of cure at room temperature, ease of molding, a good balance of mechanical, electrical and chemical properties. One of the barriers for the full utilization of the kenaf fiber reinforced UPE composites, however, is the poor interfacial adhesion between the natural fibers and the UPE resins. The good interfacial adhesion between kenaf fibers and UPE matrix is essential for generating the desired properties of kenaf-UPE composites for most of the end applications. Use of a coupling agent is one of the most effective ways of improving the interfacial adhesion. In this study, six novel effective coupling agents were developed and investigated for kenaf-UPE composites: DIH-HEA, MFA, NMA, AESO-DIH, AESO-MDI, and AESO-PMDI. All the coupling agents were able to improve the interfacial adhesion between kanaf and UPE resins. The coupling agents were found to significantly enhance the flexural properties and water resistance of the kenaf-UPE composites. Fourier transform infrared spectroscopy (FTIR) confirmed all the coupling agents were covalently bonded onto kenaf fibers. Scanning electron microscopy (SEM) images of the composites revealed the improved interfacial adhesion between kanaf fibers and UPE resins. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Kenaf en_US
dc.subject.lcsh Thermosetting composites en_US
dc.subject.lcsh Composite materials -- Bonding en_US
dc.subject.lcsh Polyesters en_US
dc.subject.lcsh Adhesives en_US
dc.subject.lcsh Adhesion en_US
dc.title Development and evaluation of novel coupling agents for kenaf-fiber-reinforced unsaturated polyester composites en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Wood Science en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Materials Science
dc.degree.level Doctoral en_US
dc.degree.discipline Interdisciplinary Studies en_US
dc.degree.discipline Wood Science en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Murthy, Ganti
dc.contributor.committeemember Nairn, John A.
dc.contributor.committeemember Karchesy, Joe
dc.contributor.committeemember Rochefort, Willie E.
dc.description.peerreview no en_us

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