期刊
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
卷 57, 期 6, 页码 479-496出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00222348.2018.1476440
关键词
Aerogel; composites; silica; tensile test; thermogravimetric analysis; unsaturated polyester
资金
- Ministry of Higher Education [FRGS 09H81]
- Ministry of Science Technology and Innovation (E-science fund) [4S132]
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 T-onset of the PS and SA composites were slightly delayed by 15 and 10 degrees 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.
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