Evaluation of Phenol Formaldehyde Resin Cure Rate

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dc.contributor.authorScott, Brian Cameronen
dc.contributor.committeechairKamke, Frederick A.en
dc.contributor.committeememberFrazier, Charles E.en
dc.contributor.committeememberLoferski, Joseph R.en
dc.contributor.departmentWood Science and Forest Productsen
dc.date.accessioned2014-03-14T20:38:33Zen
dc.date.adate2005-06-22en
dc.date.available2014-03-14T20:38:33Zen
dc.date.issued2005-04-29en
dc.date.rdate2013-11-05en
dc.date.sdate2005-05-25en
dc.description.abstractCure time is often the bottleneck of composite manufacturing processes, therefore it is important to understand the cure of today's thermosetting adhesives. This research attempts to characterize the cure rate of two commercial phenol-formaldehyde adhesives. Two methods are used, parallel-plate rheometry and dielectric spectroscopy. Viscosity data from a parallel-plate rheometer may be used to track the advance of polymerization as a function of temperature. This data can then be used to optimize press conditions and reduce production times and costs. The research will further examine resin cure through dielectric analysis; such a technique could monitor resin cure directly and in real-time press situations. Hot-pressing processes could conceivably no longer require a set press schedule; instead they would be individually set based on dielectric data for every press batch. Such a system may lead to a more efficient and uniform product because press times could be based on individual press cycles instead of entire product lines. A more likely scenario, however, is the use of in situ adhesive cure monitoring for troubleshooting or press schedule development. This research characterized the cure of two phenol-formaldehyde resins using parallel-plate rheometry, fringe-field dielectric analysis, and parallel-plate dielectric analysis. The general shape of the storage modulus vs. time curve and the gel and vitrification points in a temperature ramp were found. Both dielectric analysis techniques were able to characterize trends in the resin cure and detect points such as vitrification. The two techniques were also found to be comparable when the cure profiles of similar conditions were examined.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05252005-153236en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05252005-153236/en
dc.identifier.urihttp://hdl.handle.net/10919/33222en
dc.publisherVirginia Techen
dc.relation.haspartBScott.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectparallel-plate rheometryen
dc.subjectthermoset resin cureen
dc.subjectdielectric analysisen
dc.titleEvaluation of Phenol Formaldehyde Resin Cure Rateen
dc.typeThesisen
thesis.degree.disciplineWood Science and Forest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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