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Articles by D.M.A. Hashim
Total Records ( 3 ) for D.M.A. Hashim
  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).
  S. Hamdan , D.M.A. Hashim , M. Ahmad and C.C. Khei
  Three series of Polypropylene (PP) specimens, namely series A (without glycerol), B (with 5% glycerol) and C (with 10% glycerol) with various percentage of Decabromodiphenyl Ether (DBDE), were studied using Dynamic Mechanical Thermal Analyzer (DMTA). For series A specimen, pure PP (0% glycerol and 0% DBDE) yield the highest storage modulus E’, and the 2% of DBDE gave the lowest (most degradable) E’. 5% DBDE in series B specimen (5% glycerol) produced the lowest E’ while in series C specimen (10% glycerol) 5% DBDE yield the highest E’. For series C specimen, 0.5% DBDE yield the lowest E’ (the most degradable blend). Below the transition temperature E’ did not necessarily decreased systematically with increasing percentage of DBDE for C series specimen.
  S. Hamdan , D.M.A. Hashim , M.Z. Abdul Rahman , M. Ahmad and W.F. Wan Abdullah
  The thermo mechanical properties of poly (methyl methacrylate-co-styrene) copolymers as a function of strain rate and temperature in the range 10-3 to 10-1 s-1 and 30-200° C respectively were investigated. Copolymers of three different Methyl Methacrylate (MMA) and STyrene (ST) ratios with various percentages of cross-linking agents were prepared and tested. By measurement of the stress versus strain at various strain rates and temperatures, plots of flow stress/temperature (σƒ /T) versus strain rate (⋵) and log Young’s Modulus (log E) versus Temperature (T) were obtained. Plot of (σƒ /T versus ⋵ observed the Eyring equation. Increasing the amount of cross-linking agent improved the copolymer strength. The graph for log E versus T plot at constant stain rate indicates that a transition temperature exist at ~ 110 ° C. This is attributed to the glass transition i.e. the zones are interpreted in terms of visco-elastic transition.
 
 
 
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