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Weibull probability model for tensile properties of kenaf technical fibers

AIP Conference Proceedings 2018年第1期2030卷

作者： M. N. Zakaria A. Crosky A. Beehag 1Bio-Composite Technology Programme School of Industrial Technology Faculty of Applied Sciences Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia 2School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia 3Cooperative Research Centre for Advanced Composite Structures Limited 506 Lorimer Street Fishermans Bend Victoria 3207 Australia

Tensile properties of kenaf technical fibers were investigated and has been statistically analysed by Weibull weakest-link model. The tensile strength of kenaf fiber has been verified to follow this two-parameter Weibull distribution. The Weibull modulus varied between 1.7 and 2 for fiber tensile strength, and 1.6 to 2.4 for fiber Young’s modulus, meanwhile the scale parameter varied between 204.7 MPa and 282.2 MPa for fiber tensile strength and for Young’s modulus between 14.8 GPa and 21.2 GPa. Lowest modulus was estimated with the high number of defects contained along the fibers. The present study presented that the Weibull distribution describes the experimentally measured strength data more appropriately.

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Effect of growth times on the physical and mechanical properties of hydrophobic and oleophilic silylated bacterial cellulose membranes

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AIP Conference Proceedings 2017年第1期1885卷

作者： M. N. Zakaria A. R. Sukirah O. Maizatulnisa J. Ayuni K. Khalisanni R. Rosmamuhamadani 1Bio-Composite Technology Programme School of Industrial Technology Faculty of Applied Sciences UniversitiTeknologi MARA 40450 Shah Alam Selangor Malaysia 2Pusat Penyelidikan Bioteknologidan Nanoteknologi Ibu Pejabat MARDI Persiaran MARDI-UPM 43400 Serdang Selangor Malaysia 3Department of Manufacturing and Materials Engineering Faculty of Engineering IIUM P.O. Box 10 50728 Kuala Lumpur Malaysia 4Materials Technology Programme School of Physics & Material Studies Faculty of Applied Sciences Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia

Bacterial cellulose is an extracellular natural byproduct of the metabolism of various bacteria. Its physical and mechanical properties were determined by growth period, method of cultivation either static or agitate, fermentation condition and medium. Thispaper presented works done on the effect of culture time on the physical and mechanical properties of silylated bacteria cellulose membranes. Bacterial cellulose (BC) growth under 4, 5, 6 and 7 days had been used as a natural reinforcement material and silane as a hydrophobic coating material. With extended culture time, the tensile strength and tensile modulus were increased linearly as result of more compact structure. Due to hydrophobic properties of silane, the water absorption and thickness swelling improved correspondingly. Contact angle testingusing three different liquid proven the functionality of silane as hydrophobic and oleophilic coating agent. The experimental results suggested that hydropobicand oleophilicsilylatedbacteria cellulose membranes with controlled growth time could be prepared and regarded as a reusable oil spills membrane.

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