Abstract
Filled networks of poly(dimethyl siloxane) (PDMS) were prepared using the following wide variety of materials and techniques: (1) incorporating a commercial silica which had been treated with hexamethyldisilazane; (2) incorporating ‘wet-process’ silica which had been precipitated from a silicate in an aqueous dispersion with PDMS; (3) precipitating silica directly into PDMS during its curing; (4) precipitating silica directly into a swollen PDMS network after it was cured; (5) incorporating silica prepared from tetraethoxysilane (TEOS) and containing some PDMS, and (6) incorporating silica prepared from partially hydrolysed TEOS and also containing some PDMS. The resulting filled elastomers showed the largest values of the ultimate strength in the case of methods (4) and (6), and the largest value of the rupture energy for method (4).
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