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Articles by P.S.M. Megat-Yusoff
Total Records ( 6 ) for P.S.M. Megat-Yusoff
  M.S. Mat-Shayuti , M.Z. Abdullah and P.S.M. Megat-Yusoff
  This study investigates the effect of blending polycarbonate (PC) into polypropylene (PP) matrix polymer on water absorption properties and morphology. The blends, containing 5-35% of polycarbonate and 5% compatibilizer, were compounded using twin - screw extruder and fabricated into standard tests samples using compression molding. The compatibilizer used was polypropylene-graft-maleic anhydride (PP-g-MA). In water absorption test, specimens were immersed in distilled water at 23 and 100°C. In 23°C immersion, PC showed the highest absorption at 0.362 wt.% while PP was the lowest at 0.064 wt.%. The blends demonstrated transitional absorption value between PP and PC. In 100°C immersion, 90/5/5, 80/15/5 and 70/25/5 compositions (PP/PC/PP-g-MA) exhibited lower absorption than PP, indicating enhanced long-term degradation resistance in water compared to PP. Microscopy analysis showed that PC existed as fibers, dispersed throughout PP matrix.
  N. Amir , F. Ahmad and P.S.M. Megat-Yusoff
  The study presented the works on the effects of fibre reinforcement to the char characteristics of epoxy-based intumescent coating formulations. Reinforcing fibres such as glass fibre and carbon fibre that were manually cut to 10mm in length and chopped fibre strands 3mm length into formulations developed using commercial phosphate-based materials i.e. ammonium polyphosphate (APP), pentaerythritol (PER) and melamine (MEL) as the main ingredients. Five formulations; control (without fibre), glass fibre reinforced, carbon fibre reinforced, hybrid fibre (glass and carbon fibres) reinforced and chopped fibre reinforced were prepared. Powder formulations were grinded using Rocklabs grinder and epoxy-mixed using Caframo mixer, where the maximum speed used was 150 rpm and later hand-applied onto primer coated carbon steel substrates at room temperature. Natural drying time at room temperature for the coatings to fully dry was determined. Thermogravimetric analysis (TGA) was conducted on epoxy, hardener and the mixes. Char formation and physical properties were investigated after the samples were exposed to high temperature fire tests up to 400 and 800°C, respectively using electric furnace, Carbolite. Char height, weight, crispness, cell structure were examined and compared. Scanning Electron Microscopy (SEM) characterizations were also conducted to inspect fibre distribution and condition in the coatings as well as in the char. The intumescent coatings prepared get fully dried in one to two days with the formulations having epoxy to hardener ratio of 2:1 demonstrated better fire performance char than 1:1 ratio. The results also showed long- carbon and glass fibres promote improved char’s cell structure, height and strength. Though both promotes more char and experienced less weight loss, carbon fibre was more superior as it did not degraded.
  Sami Ullah , Faiz Ahmad , P.S.M. Megat-Yusoff and Nurul Hazwani binti Azmi
  Intumescent coating is an insulating system designed to decrease heat transfer from a fire to substrate structure to maintain its integrity. Zinc phosphate was used as primer coating on steel coupons for better protection from corrosion. The coating was based on Expandable graphite (EG), ammonium poly phosphate (APP), melamine, boric acid (B.A), bisphenol A epoxy resin BE-188 (BPA) and ACR Hardener H-2310 polyamide amine. Different formulations were developed to study the bonding of coating with steel substrate. The Intumescent coating was tested at 500°C for one h and it was found very stable and well bound with the steel substrate. Scanning Electron Microscope was used to study microstructure the substrate and bonding mechanism of coating with substrate after fire test. The results confirmed that coating was well bounded with steel substrate after fire test.
  P.S.M. Megat-Yusoff , M.R. Abdul Latif and M.S. Ramli
  This study reports on the influence of injection molding processing parameters on mechanical properties of oil palm Empty Fruit Bunch (EFB) filled High Density Poly Ethylene (HDPE). The biocomposite pellets were first prepared using an extruder with 20 wt% EFB content before being processed in an injection-molding machine for specimen fabrication. Two processing parameters were varied systematically and independently during the composite sample fabrication. The holding pressure was increased from 60 to 90 bars while the injection temperature was varied from 150 to 210°C. The highest tensile strength of the composites was achieved at 70 bar holding pressure and 150°C injection temperature. However, the highest fracture strength was achieved at 80 bars whilst maintaining the injection temperature at 150°C. Flexural strength was shown to be unaffected by the varying pressure. The optimal processing parameters for highest mechanical performance were found to be at holding pressure of 80 bars and injection temperature of 150°C. Scanning Electron Microscopy (SEM) observation of the fractured surfaces revealed agglomeration of fibers which contributed to poor adhesion of the fibers to the matrix material.
  Sami Ullah , Faiz Ahmad and P.S.M. Megat-Yusoff
  In this study, we have discussed the thermal behaviour of intumescent coating. Intumescent coating is an insulating system designed to decrease heat transfer from a fire to substrate structure to maintain its integrity. The coating was based on Expandable Graphite (EG), Ammonium Poly Phosphate (APP), melamine, boric acid, kaolin clay (Al2Si2O5(OH)4), bisphenol. A epoxy resin BE-188 (BPA) and ACR hardener H-2310 polyamide amine as curing agent. Different formulations were developed to study the heat shielding effect. The C4 formulation showed better result on the heat shielding effect; it is further modified by adding kaolin clay 3-5 wt% in the next three formulations. Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) was done to study thermal analysis and char morphology of the formulations. The result showed that by adding the filler kaolin clay, the fire retardant time of coating was extended. The result showed that thermal behaviour of intumescent coating formulation was improved with 5 wt% of kaolin clay.
  N. Amir , F. Ahmad and P.S.M. Megat-Yusoff
  Intumescent coatings are used to protect steel structures from fire attack. However, soft chars from traditional formulations make the protection less effective. The aim of this research was to study three formulations of Fibre Reinforced Intumescent Coatings (FRIC) using various types of wool fibres. Fibre reinforcement was introduced to strengthen the coatings and their chars for better fire protection to the substrate. The FRIC coatings were fired to 800°C for 1 h duration in a furnace to produce fibre reinforced chars. Examination using Field Emission Scanning Electron Microscopy (FESEM) was conducted on the coatings and their chars for morphology study. These scans explained the roles played by the fibres, where a number of mechanisms in strengthening the chars were observed. Energy Dispersive X-ray (EDX) Spectroscopy analysis between the coatings and their chars showed that FRIC was able to sustain high temperature materials and therefore was considered to have rise the char strength and fire protection. These findings concluded that fibre reinforcement strengthened FRIC chars in four mechanisms.
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