Determination of the optimum composition of a urethane-silica mixture, which would form crosslinked products, presented a significant problem in these studies. The unmodified silica was dosed at various ratios as compared to urethane elastomer: 2.5, 5.0, 7.5 and 10.0 phr. The optimum amount of the filler (precipitated silica) was found to be 5 phr and this amount of silica was subjected to modification with 3 and 5 weight parts of aminosilane U-15 or mercaptosilane A-189, per 100 weight parts of SiO2.
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Jesionowski et al. (2001) studied this question.
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