By P. Plesch
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Example text
In general, these results show an apparent decrease in W1 / 2 with increasing crosslinking level, although the decrease in values is rather insignificant in comparison with the changes seen for NR vulcanizates. These changes observed for EPM did not appear large enough to be utilized for calibration purposes. 10) show very little peak broadening with increasing crosslink levels when measured at room temperature. 8 Solid state l3c NMR spectra of EPM (Copolymer 054) peroxide vulcanizates with high (a), medium (b), and low (c) crosslink densities.
It serves to emphasize the importance of using fixed operating conditions when performing this type of measurement, as is well established for the swollen-state NMR technique. To determine if similar effects can be observed for sulphur curing systems in NR, compounds were prepared and vulcanized by using a range of sulphur and TMTD levels at a fixed S:TMTD ratio. 2. 3. 3. 2 Solid-state 13e NMR spectra of NR gum vulcanizates cured with different levels of dicumyl peroxide; olefinic region. ) olefinic signals.
The elastic constant, C v was determined from equilibrium modulus measurements performed on a Greensmith's machine [1]. The values of the physically manifested crosslink concentration were then calculated via the Mooney-Rivlin relationship. 95 mm outside diameter. 16 MHz. 00 ppm). 3 ~sec), a delay of 5 sec, high power proton decoupling (47 Hz), and magic angle spinning. 7 C-4 C-5 It was necessary to identify the most suitable signal or signals in the spectrum for the measurement of peak broadening and to define a general procedure for its measurement.