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Effects of rice husk derived amorphous silica on the thermal-mechanical properties of unsaturated polyester composites

Abd. Halim, Zulhelmi Alif and M. Yajid, Muhamad Azizi and Idris, M. Hasbullah and Hamdan, Halimaton (2018) Effects of rice husk derived amorphous silica on the thermal-mechanical properties of unsaturated polyester composites. Journal of Macromolecular Science, Part B: Physics, 57 (6). pp. 479-496. ISSN 0022-2348

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Official URL: http://dx.doi.org/10.1080/00222348.2018.1476440

Abstract

Rice husk is rich in amorphous silica which has found various applications as a filler in rubbers and plastics. In the research described here silica was extracted from rice husk ash in the form of sodium silicate which was used to produced amorphous precipitated silica (PS) and silica aerogel (SA) using a sol–gel process and supercritical drying. These materials were then physically mixed with unsaturated polyester (UP) resin and cured at room temperature to form polymer composites. The experimental results showed that the UP composites with 30% (volume percent) of SA filler had lower density and better thermal insulation than the composites with the same amount of PS. Thermogravimetric analysis (TGA) results showed that the Tonset of the PS and SA composites were slightly delayed by 15 and 10°C, respectively. The tensile stress-strain curves showed that addition of the fillers reduced the tensile strength, but increased the elastic moduli of the UP matrix. PS filled UP composites exhibit higher moduli (higher stiffness) than that of SA filled UP composites. This was due to agglomeration and poor adhesion of the SA particles to the UP matrix while better dispersion was observed for the PS filled composite.

Item Type:Article
Uncontrolled Keywords:aerogel, composites, silica, tensile test, thermogravimetric analysis, unsaturated polyester
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:85449
Deposited By: Yanti Mohd Shah
Deposited On:30 Jun 2020 16:45
Last Modified:30 Jun 2020 16:45

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