Abstract
Silica/polymer hollow microspheres were prepared via double in situ mini-emulsion polymerization by taking advantage of phase separation between the growing polymer and inorganic TEOS phase. Then hybrid hollow microspheres were surface modified by the addition of GMA during the process of polymerization. The obtained surface–functional hybrid hollow microspheres were applied as a filler in polysulfide sealant system. The inorganic/polymer hollow microspheres were characterized by Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), thermogravimetric/derivative thermal gravimetric analysis (TGA/DTG), and thixotropic experiment, respectively. The results showed that the as-prepared inorganic/polymer microspheres had a hollow structure and the size was in the range of 200–600 nm. The thixotropy and heat resistance properties of polysulfide sealant were improved after the addition of hybrid hollow microspheres.
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