Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties

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dc.contributor.authorGhosh, Indrajiten
dc.contributor.committeechairGlasser, Wolfgang G.en
dc.contributor.committeememberFrazier, Charles E.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T20:45:18Zen
dc.date.adate1999-09-23en
dc.date.available2014-03-14T20:45:18Zen
dc.date.issued1999-09-08en
dc.date.rdate2000-09-23en
dc.date.sdate1999-09-11en
dc.description.abstractBiodegradable thermoplastic composites were prepared using high modulus lyocell fibers and cellulose acetate butyrate (CAB). Two reinforcement fiber types: fabric and continuous fiber tow were used. Fabric had advantages of uniform alignment and easier processing, but lacked the use as a unidirectional reinforcement and a continuous method of matrix application. Three different matrix application methods were screened for both fiber types. Matrix application by suspension of particles in water was not feasible because of particle sizes > 15 &micro m. The other disadvantages were high moisture absorption during matrix application and void formation during consolidation. Melt processing technique using alternating sandwich structure of fabrics and CAB films produced composites with impressive appearance, low void contents and low moisture absorption. However, SEM results revealed interfacial failure and extensive fiber pull out. Relatively larger fiber and matrix regions were present on the scale of 10<sup>-3</sup>m. Solution prepregging technique using methyl ethyl ketone (MEK) as a solvent for CAB and continuous fibers as reinforcement produced composites with uniform matrix distribution, high tensile strengths and high modulus, and even wetting of fibers by CAB. A maximum tensile modulus of 21.5 GPa and a maximum strength of 251.7 MPa were achieved for a continuous fiber reinforced composites at a volume fraction of 66.5% compared to 0.8 GPa and 76 MPa for the matrix, respectively. Void contents and water absorption were relatively high compared to comparable carbon fiber composites.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-091199-201727en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-091199-201727/en
dc.identifier.urihttp://hdl.handle.net/10919/35023en
dc.publisherVirginia Techen
dc.relation.haspart6REFERENCES.PDFen
dc.relation.haspart7VITA.PDFen
dc.relation.haspart4RESULTSANDDISCUSSION.PDFen
dc.relation.haspart5CONCLUSIONS.PDFen
dc.relation.haspart1COVERANDCONTENTS.PDFen
dc.relation.haspart2INTRODUCTION.PDFen
dc.relation.haspart3EXPERIMENTAL.PDFen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectbiodegradable compositeen
dc.subjectcelluloseen
dc.subjectcellulose esteren
dc.subjectfiberen
dc.subjectcellulose acetate butyrateen
dc.subjectlyocellen
dc.subjectsolution prepreggingen
dc.subjecthigh modulus.en
dc.subjectCompositeen
dc.titleLyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Propertiesen
dc.typeThesisen
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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