Rheometrics System IV

Viscosity measurements were made using a Rheometrics System IV-dynamlc mechanical spectrometer. 

The dynamic mechanical data were obtained in two different modes. The low temperature data (-140°C to 20 C) were obtained in the torsion mode on a Rheometrics System IV at 10 rad/sec. The high temperature data were obtained in the parallel plate mode on a Rheometrics Mechanical Spectrometer at 10 rad/sec. 

Siloxanes A2 and A were obtained from Petrarch Chemicals and B2, M 1400, was obtained from Prof. J. P. Kennedy, Univ. of Akron, Akron, OH. The catalyst was used as a 0.1% stock solution in toluene. Rheological measurements during end-linking were made with a Rheometrics System IV Mechanical Spectrometer. N IR data were obtained with the Nicolet 293A 300 MHz spectrometer. FTIR spectra were obtained on a Nicolet 60SX using 64 scans. 

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