 BackShort Report ScienceAsia 24 (1998): 199-204 |doi: 10.2306/scienceasia1513-1874.1998.24.199 PRACTICAL USE OF THE MOONEY-RILVIN EQUATION FOR DETERMINATION OF DEGREE OF CROSSUNKING OF SWOLLEN NR VULCANISATESN. SOMBATSOMPOPABSTRACT: The Mooney-Rilvin equation was used for determining the degree of crosslinking of rubbers based on their stress-strain behaviour. Non-linear bahaviour of the Mooney-Rilvin curve under valid elongation and change in the crosslink density for swollen NR vulcanisates were observed, this being not the case for unswollen vulcanisates. The non-linear bahaviour was caused by prior-extensibility of the rubbers whereas the change in the degree of crosslinking resulted from differences in the directional stresses in the NR compounds during swelling. The crosslink densities from the use of the Mooney-Rilvin equation were then compared to those from a swelling method based on the Flory-Rehner equation Division of Materials Technology, School of Energy and Materials, King Mongkut's University of Technology Thonburi (KMUTT), Bangmod,Bangkok 10140, Thailand. Received July 20, 1998
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