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Unformatted text preview: d Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia E-mail: [email protected] Epoxidized soybean oil was successfully thermal cured in the presence of catalyst (at concentration 0.3 0.7 phr). The fracture behaviour of this bio-epoxy was characterized using the principle of linear elastic fracture mechanics (LEFM) and essential work of fracture (EWF). It was determined that the fracture toughness (KIC) and specific essential work of fracture ( we) of the bio-epoxy increased with catalyst loading whereas the specific plastic fracture work (βwp) of the epoxy system showed the reverse trend. Also, it was found that there was a direct relationship between the crack length to width ratio ( a/W ratio) and the fracture toughness. Specimen geometry plays an important role in influencing the fracture toughness of the bio-epoxy. LEFM is valid for brittle specimen which fails in catastrophic manner whereas EWF is only used for the specimen which exhibits plastic deformation before fracture. 224 3rd ICYC 2010 Universiti Sains Malaysia POLY-O13 23rd-25th June 2010 THERMAL PROPERTIES OF ORGANO-MONTMORILLONITE FILLED VIRGIN- AND RECYCLEDPOLY(ETHYLENE TEREPHATHALATE) S. R. Lim and *W. S. Chow School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, 14300 Pulau Pinang, Malaysia E-mail: [email protected] In this research, both virgin and recycled poly(ethylene terephthalate) (i.e. vPET and rPET) containing 3 to 9 wt % organo-montmorillonite (OMMT) were melt-compounded using twin-screw extrusion technique followed by injection molding. The thermal properties of the PET/OMMT nanocomposite were characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). It was found that the melting temperature (Tm) of both vPET and rPET did not alter by the addition of OMMT. However, both vPET and rPET nanocomposites revealed a decrease in degree of crystallinity and a slightly increa...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11