Type of Document Master's Thesis Author Ghosh, Indrajit Author's Email Address email@example.com URN etd-091199-201727 Title Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties. Degree Master of Science Department Chemical Engineering Advisory Committee
Advisor Name Title Glasser, Wolfgang G. Committee Chair Davis, Richey M. Committee Member Frazier, Charles E. Committee Member Keywords
- biodegradable composite
- cellulose ester
- cellulose acetate butyrate
- solution prepregging
- high modulus.
Date of Defense 1999-09-08 Availability unrestricted 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 µ 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 10-3m. 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.
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28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access 1COVERANDCONTENTS.PDF 24.92 Kb 00:00:06 00:00:03 00:00:03 00:00:01 < 00:00:01 2INTRODUCTION.PDF 525.32 Kb 00:02:25 00:01:15 00:01:05 00:00:32 00:00:02 3EXPERIMENTAL.PDF 195.08 Kb 00:00:54 00:00:27 00:00:24 00:00:12 00:00:01 4RESULTSANDDISCUSSION.PDF 7.19 Mb 00:33:17 00:17:07 00:14:58 00:07:29 00:00:38 5CONCLUSIONS.PDF 81.44 Kb 00:00:22 00:00:11 00:00:10 00:00:05 < 00:00:01 6REFERENCES.PDF 94.29 Kb 00:00:26 00:00:13 00:00:11 00:00:05 < 00:00:01 7VITA.PDF 46.00 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01
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