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Articles by S. Hamdan
Total Records ( 3 ) for S. Hamdan
  S. Hamdan , D.ZM.A. Hashim , M. B. Ahmad and W.F.W. Abdullah
  Copolymers of methyl methacrylate (MMA) and styrene (ST) at different ratios (1:1, 2:1, and 1:2) were prepared with various percentage of ethylene glycol dimethacrylate (EGDMA) as cross-linking agent. The percentage of cold crystallization was estimated on the basis of exothermal energy. Copolymers with higher ratios of MMA produce higher percentage of crystallization, but surpassingly yield lower melting temperature. Although the percentage of crystallization increases with EGDMA content, the melting temperature decreases with higher content of EGDMA.
  S. Hamdan and D.M.A Hsahim
  Samples of wooden cross-arms from cengal (Balanocarpus haemic) loaded in compressions in the radial direction were studied and compared with those swollen by moisture or water. The modulus of elasticity at various Moisture Contents (MC) was measured from 0 to 100 °C. Compared with the Environmental Moisture Content (EMC), the Fiber Saturated Point (FSP) samples swollen by moisture showed extensive decreased in the modules of Elasticity (E) than the Fully Water Saturated (FWS) samples swollen by water.
  S. Hamdan , M.Z. Abdul Rahman , D.M.A. Hashim and N. Ahmad
  Blends consisting of a systematic compositional series of Sago Starch (SS) and chitosan (CS) were studied by using a Brookfield Digital Viscometer Model DV-II Version 2.0. The viscosity of pure SS, pure CS and SS/CS blends was measured over the temperature range 30-130 °C. Results on the SS/CS blends indicate that the viscosity decreases with temperature and SS content for a fixed speed. At lower SS content, the decrease of viscosity with temperature is more pronounced. This indicates that blends with higher CS content are more affected by temperature changes. Blend containing 50%CS was superior compared to other blends and this finding is consistent with earlier works on compatibility studies of polypropylene/sago starch blend using Dynamical Mechanical Thermal Analyzer (DMTA).
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