Areerat, Surat

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Areerat, Surat
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Areerat, S.
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surat.ar@kmitl.ac.th

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    Effect of moisture on the mechanical properties of glass fiber reinforced polyamide composites
    (2016-05-01)
    Chaichanawong, Jintawat
    ;
    Thongchuea, Chanchai
    ;
    Areerat, Surat
    The effect of moisture on the mechanical properties of glass fiber reinforced polyamide composites was investigated. The composites of short glass fiber/polyamide with different weight percent (0-30 wt%) were prepared. To investigate the effect moisture on mechanical properties of these composites, the specimens were prepared and then immersed in distilled water for a period of 60 days. The weight changes of the specimens were daily measured to determine the amount of moisture absorption of the specimens. Tensile test and flexural test were conducted based on ASTM D638-02a and ASTM D790-02, respectively. The effect of moisture on the microstructure of the composites was also investigated. The moisture absorption of the glass fiber reinforced polyamide composites could be divided into four stages: (I) the beginning stage (1-7 days), (II) the second stage (8-24 days), (III) the third stage (25-35 days) and (IV) the saturated stage (36-60 days). Yield strength, ultimate tensile strength and flexural strength of all specimens significantly decreased at the beginning stage of moisture absorption and then these mechanical properties were almost constant. The modulus of elasticity of all specimens decreased at the beginning stage and saturated stage. In addition, ductility (%Elongation) of all specimens did not change at the beginning stage. However, ductility of all specimens significantly decreased in the third stage, and then their ductility were almost constant. Based on the microstructure analysis, the results indicated that the transition of brittle to ductile properties of the glass fiber reinforced polyamide composites after moisture absorption would be attributed to the changes in their mechanical properties.
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    Preparation of carbon aerogel microspheres by a simple-injection emulsification method
    (2013-09-01)
    Chaichanawong, Jintawat
    ;
    Kongcharoen, Koranit
    ;
    Areerat, Surat
    Carbon aerogel microspheres were successfully prepared using a simple-injection emulsification method, employing sol-gel polycondensation of a resorcinol-formaldehyde solution containing sodium carbonate as a catalyst. This process was followed by solvent exchange using acetone, supercritical drying with carbon dioxide and carbonization in a nitrogen atmosphere. The effect of curing time before starting injection, injection rate and agitation rate of continuous phase on the particle size and the porous properties of the carbon aerogel microspheres was investigated. Adsorption of phenol by using the prepared carbon aerogel microspheres was also examined. The diameter of carbon aerogel microspheres was controlled in the range of 20-55 μm by varying injection rate and agitation rate. The mean diameter of carbon aerogel microspheres decreased with increasing the injection rate and the agitation rate, whereas their mean diameter was independent of the curing time. The BET surface area and total pore volume of carbon aerogel microspheres increased with increasing the curing time. In contrast, their BET surface area and total pore volume decreased with increasing the injection rate and the agitation rate. The BET surface area, total pore volume, mesopore volume and micropore volume of the carbon aerogel microspheres with a mean diameter of 45 μm were 903 m <sup>2</sup>/g, 0.60 cm<sup>3</sup>/g, 0.31 cm<sup>3</sup>/g and 0.27 cm <sup>3</sup>/g, respectively. The phenol-adsorption capacity of these carbon aerogel microspheres was 29.3 mg phenol/g adsorbent. © 2013 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.