Volume-7 , Issue-3 , Sep 2020, ISSN 2348-6341 Go Back

• Open Access   Article

  Deproteinized Natural Rubber Latex Slow-recovery Foam Intended for Shoe Insoles Application

  R. Roslim, K.L. Mok, M.R. Fatimah Rubaizah, K. Shamsul, K.S. Tan

  Research Paper | Journal-Paper (JPCM)

  Vol.7 , Issue.3 , pp.1-9, Sep-2020

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  Abstract
  Currently, there is a huge demand for pressure-relief and shock absorbing shoe insoles made from natural-based material to substitute the conventional synthetic materials. Therefore, this study developed a novel slow-recovery foam made from deproteinised natural rubber latex. In this paper, the deproteinised natural rubber latex slow-recovery foam was fabricated at three density levels and their “slow-recovery” characteristic was observed. It is of note that the foam samples are able to retain an imprint for approximately 4-5 seconds when pressed. A modern in-shoe pressure mapping system was used to confirm the ability of the insoles to lower peak pressure value by providing total larger contact area as compared to the conventional insoles that made from standard natural rubber latex foam. The pressure relief performance was also comparable to the commercially available synthetic-based slow-recovery insoles. The as-prepared foam has higher energy absorption, evidenced from a simple bouncing test using a silica ball. The height the silica ball bounced after dropping from a fixed height was measured and the results indicate the impact absorbing ability of various foam samples. The impact absorbing property was further confirmed through a static and dynamic damping study whereas, energy absorption capability (area under hysteresis curve) of deproteinised natural rubber latex slow-recovery foam was higher than other foam materials.

  Key-Words / Index Term
  Slow-Recovery Foam, Deproteinised Natural Rubber Latex, Pressure-Relief, Shock Absorption, Shoe Insoles

  References
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  Citation
  R. Roslim, K.L. Mok, M.R. Fatimah Rubaizah, K. Shamsul, K.S. Tan, "Deproteinized Natural Rubber Latex Slow-recovery Foam Intended for Shoe Insoles Application," Journal of Physics and Chemistry of Materials, Vol.7, Issue.3, pp.1-9, 2020

• Open Access   Article

  Evaluation of Solution Temperature and Treatment Time Effects of Zinc Phosphating on AISI 5140 Alloy Steel

  Husein Meshreghi, Fawzi Adawi

  Research Paper | Journal-Paper (JPCM)

  Vol.7 , Issue.3 , pp.10-15, Sep-2020

  Abstract

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  Abstract
  Chemicals coatings are protective surface coatings applied to metals under controlling condition. Phosphating is one of the most widely used metal pretreatment process. Due to its economy, corrosion resistance, wear resistance, adhesion and lubricative properties. The treatment of steel with a dilute solution of phosphoric acid and other chemicals in which the surface of the alloy steel, reacting chemically with the phosphoric acid, is converted to an integral, mildly protective layer of insoluble crystalline phosphate. To achieve better understanding of the coating formation on the alloy steel AISI 5140, zinc phosphate coating process was carried out in lab scale for different phosphating times and treatment temperatures. The influences of immersion time and solution temperature on the surface appearance, coating thickness, coating hardness and roughness were investigated. The results of appearance show defects on the surfaces in conditions of 60, 70ºC and phosphate time 1, 2 and 3 min, while good appearance was noted in conditions of 90ºC and phosphate time 3 & 4 min. coating weight, coating thickness and coating hardness were increased with an increase of phosphate time and temperature.

  Key-Words / Index Term
  coatings, corrosion, phosphating, surfaces

  References
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  Citation
  Husein Meshreghi, Fawzi Adawi, "Evaluation of Solution Temperature and Treatment Time Effects of Zinc Phosphating on AISI 5140 Alloy Steel," Journal of Physics and Chemistry of Materials, Vol.7, Issue.3, pp.10-15, 2020