Abstract - Investigating Crosslinking in Blends by Differential Scanning Calorimetry


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Investigating Crosslinking in Blends by Differential Scanning Calorimetry S. Cook, S. Groves and A.J. Tinker Linear correlations between physical crosslink density and T_g, as measured by high DSC, have been demonstrated for NR, BR and SBR gum vulcanisates. The dependence of T_g on crosslink density was similar for both NR and BR vulcanisates but was significantly less than that demonstrated for SBR. In the case of NR, the T_g was also related to the level of sulphur in the compound and hence the efficiency of the cure. To achieve the high level of precision required in the DSC measurements it was found necessary to perform duplicate runs of each sample and to calibrate the instrument before and after each run by measuring the T_g of raw NR (-72°C). The correlations found between physical crosslink density and T_g for the respective polymers had been used to estimate the physical crosslink density of NR/BR and NR/SBR blends. A suitable calibration.for these measurements was found to be a raw rubber (unvulcanised) blend of the same polymer composition rather than the individual raw polymer. Estimates of physical crosslink densities of blends made by DSC compared well with measurements made by swollen state ¹H NMR. back
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