Mohamad Syahmie Mohamad Rasidi
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Preferred name
Mohamad Syahmie Mohamad Rasidi
Official Name
Mohamad Syahmie , Mohamad Rasidi
Translated Name
M. Syahmie
Alternative Name
Rasidi, M. Syahmie
Rasidi, Mohamad Syahmie Mohamad
Rasidi, Mohd
Rasidi, M. S. M.
Syahmie Rasidi, M.
Main Affiliation
Scopus Author ID
56051090900
Researcher ID
GFR-1887-2022

Research Output
Now showing 1 - 2 of 2
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Publication

Effect of styrene content on structure and properties of vulcanizates from natural rubber grafted with polystyrene

2025 , Nabil Hayeemasae , Siriwat Soontaranon , Zunaida Zakaria , Mohamad Syahmie Mohamad Rasidi , Abdulhakim Masa

Graft copolymer from natural rubber grafted with polystyrene (NR-g-PS) was prepared. Influences of polystyrene (PS) content grafted on the natural rubber (NR) were investigated. Prior to compounding and compression molding to vulcanizates, the graft copolymers were prepared by emulsion polymerization. Proton nuclear magnetic resonance confirmed the chemical structure of the graft copolymer as NR-g-PS. Grafting of PS onto NR improved the tensile modulus and tensile strength of the vulcanizate, whereas the elongation at break decreased, depending on the PS content. However, a drastic reduction of tensile strength and elongation at break were seen when the PS content was greater than 20%. Compared to ungrafted NR, the onset strain for deformation-induced crystallization of graft copolymers was reduced, while the crystallinity at a given strain was higher. The improved tensile properties and crystallization ability suggest interfacial interactions of NR and PS phases. Such interactions were also responsible for improved thermal stability of the graft copolymer, having the degradation temperature increased by 17–38°C over the ungrafted NR. The best balance in overall properties was achieved by NR/PS 90/10.

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Publication

Effect of dispersing agents on the electrical and mechanical performance of GNPs filled epoxy nanocomposite

2023-07 , Wong Wee Chun , Teh Pei Leng , Yeoh Cheow Keat , Azlin Fazlina Osman , Lim Bee Ying , Mohamad Syahmie Mohamad Rasidi

In this work, graphene nanoplatelets (GNPs) filled epoxy nanocomposites with the addition of different dispersing agents were fabricated using a method combines mechanical mixing and tip sonication. The loading of GNPs used is 0.8 vol% determined previously as the amount required to achieve the percolation threshold to conduct electricity. Three dispersing agents were used in this work: Sodium dodecyl sulphate (SDS), ethanol and Phenyl glycidyl ether (PGE), with loadings varying from 2 vol% to 10 vol%. The incorporation of dispersing agent enhanced the electrical bulk conductivity of GNPs filled nanocomposites. The mechanical performance (flexural properties and fracture toughness) of the nanocomposite were evaluated and compared. The optimum loading of SDS to obtain the highest flexural strength and fracture toughness is 2 vol%, where further increases will deteriorate the performance of nanocomposites. On the other hand, the optimum loading of ethanol and PGE are 4 vol%. The fracture toughness of GNPs filled nanocomposites improved with the addition of 2 vol% SDS and deteriorated with increasing loadings of SDS up to 10 vol%. By incorporating 4 vol% of ethanol, the optimum fracture toughness of the nanocomposite is achieved. Fracture toughness is then dropped with further increases in ethanol. The addition of PGE caused deterioration in fracture toughness of GNPs filled epoxy nanocomposite.

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