Mohamad Kahar Ab Wahab
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Preferred name
Mohamad Kahar Ab Wahab
Official Name
Mohamad Kahar, Ab Wahab
Alternative Name
Kahar, Ab Wahab M.
Mohd Kahar, Ab Wahab
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Scopus Author ID
54793162000
Researcher ID
CYR-1062-2022

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  • Publication
    Morphological analysis on crosslinked plasticized starch filled with microcrystalline cellulose
    ( 2021-05-03)
    Foong J.Y.
    ;
    Mohamad Kahar Ab Wahab
    ;
    Mohd Fairul Sharin Abdul Razak
    ;
    Yusrina Mat Daud
    This work investigates the effect of the photo and peroxide crosslinked thermoplastic starch on the morphological properties of thermoplastic starch (TPS) / microcrystalline cellulose (MCC) films. Granulated starch will converted into thermoplastic like in the presence of glycerol as plasticizer. The amount of MCC filler carried out in this research is 0 %, 3 %, 6 %, 9 % and 12 % of the dry weight of starch. The morphological properties of photo-crosslinked TPS and peroxide crosslinked TPS were were analysed by using scanning electron microscope (SEM) and optical microscope for soil burial and weathering test. Each formulation has undergone tensile test to study their stress-strain properties and the optimum formula is obtained for subsequent studies. The increasing MCC loading increase the tensile properties of the TPS/MCC up to 6% MCC as support by morphology study. The increament in tensile strength was confirmed by the SEM study that showed better dispersion of MCC in the TPS matrix and exhibited coarser surfaces as compared to uncrosslinked counterpart. The TPS/MCC films also can last more than 20 days under soil burial test. The thermoplastic starch films will start to degrade after placed under normal weathering conditions for 20 days while the addition of rainfall will also accelerate the degradation process.
      1  22
  • Publication
    Effect of glycerol as plasticizer on the tensile properties of chitosan / microcrystalline cellulose films
    ( 2021-05-03)
    Lau S.
    ;
    Mohamad Kahar Ab Wahab
    ;
    Yusrina Mat Daud
    The chitosan/microcrystalline cellulose (MCC) film was produced through solution casting with different composition of MCC and the presence of plasticizer. This chitosan /MCC film is a biodegradable polymer due to all the ingredient was natural resources. MCC and chitosan can be found abundantly in the earth, thus, can be obtained easily. One testing was conducted which was tensile test. The optimum ratio of chitosan/MCC was 97:3 (chitosan:MCC). At this ratio, chitosan /MCC film has the highest tensile strength which was 14.73 MPa without adding any plasticizer. By the addition of plasticizer, properties of chitosan /MCC film was improved. Glycerol was used in chitosan /MCC film as plasticizer. Higher tensile strength and elongation at break follow by lower Young's modulus were the result showing that with the addition of glycerol, their film properties were able to be enhanced. About 13.57% increment in tensile strength and 47.66% in elongation at break of optimum ratio for plasticized chitosan/MCC films compared to unplasticized films.
      1  23