Properties of Vulcanized Polyisoprene Rubber Composites Filled with Opalized White Tuff and Precipitated Silica

Table 4

Assignment of the bands in the FTIR spectra of OWT and PSi.

Assignment	OWT	PSi
Si–O out of plane deformation	466 cm^−1	467 cm^−1
Si–O bending	792 cm^−1	795 cm^−1
Si–OH stretching	907 cm^−1	—
Si–O–Si stretching	1119 cm^−1	1088 cm^−1
O–H (molecular water)	1635 cm^−1	1641 cm^−1
OH stretching	3438 cm^−1	3480 cm^−1