From the fesem micrographs it was found that the

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Unformatted text preview: he tensile properties of t he composites. The results indicated that tensile strength and elongation at break decreased with increasing filler loading whereas tensile modulus exhibited an increasing trend. The matrix -filler interactions of the composites at the interface decreased with increasing filler loading. Scanning electron microscopy (SEM) of the tensile fractured surfaces of the composites showed that the presence of OXPE enhanced the interfacial interaction of the kenaf core filler and HDPE/soya protein matrix. The presence of OXPE also enhanced the tensile properties of the composites. 233 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia POLY-P12 PREPARATION AND CHARACTERIZATION OF CHITOSAN-COATED SILICA NANOPARTICLES - A POTENTIAL SUPPORT FOR HETEROGENOUS CATALYST A. Haghighizadeh, *M. Abu Bakar, S. Ab Ghani and N.H.H. Abu Bakar Nanoscience Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: This work is concerned about synthesizing heterogenous catalyst with the system of dual supports. Th us silica coated by chitosan has been chosen as the supports due to good thermal and chemical stability . Silica nanoparticles were synthesized via stöber method. The effect of surfactant towards the average size and dispersity of silica particles were studied. Although the average size of particles synthesized with surfactant is larger (72.04 ±6.42 nm), but it provide better dispersity compared to without surfactant (59.66 ±7.27 nm). The silica particles were then coated with chitosan by using three types o f deposition agents viz aq NaOH/MeOH and NaOH/Acetone. The average size and dispersity of silica particles then obtained are quite similar which are 67.70 ±7.54, 65.91 ±5.59 and 65.54 ±9.75 nm, respectively. However the coated shell was clearly seen by using NaOH/MeOH. FTIR analysis was used to study the interactions between chitosan and silica. 234 3rd ICYC 2010 Universiti Sains Malaysia 23rd-25th June 2010 ORAL PRESENTATION (OTHER) OTH-O1...
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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.

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