Fig. 1. Synthesis process of sulfonation of thermally expandable microsphere.
Fig. 2. Synthesis process of sulfonation of microsphere and thermally expandable microsphere-silica composite aerogel.
Fig. 3. FT-IR spectra of pristine microsphere (black line) and functionalized microspheres (red line).
Fig. 4. FT-IR spectra of (a) pristine silica aerogel and (b) thermally expandable microsphere-silica composite aerogel.
Fig. 5. SEM images of (a) thermally expandable microsphere, (b) pristine silica aerogel, (c) thermally expandable microsphere-silica composite aerogel and (d) the EDS result of thermally expandable microsphere-silica composite aerogel.
Fig. 6. TGA result of pristine thermally expandable microsphere and thermally expandable microsphere-silica composite aerogel.
Table 1. Thermal conductivity of pristine silicone resin and mixture of silicone resin and thermally expandable microsphere-silica composite aerogel
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