This study investigates the relationship between network characteristics and mechanical properties in sulfur-crosslinked Nitrile Butadiene Rubber (NBR) applying various methods for network and mechanical characterization. Results indicate a clear correlation between transmitted torque and crosslink density, with both decreasing by approximately 13% as curing temperature rises from 150°C to 170°C. Multiple-quantum nuclear magnetic resonance (MQ-NMR) spectroscopy confirmed this trend, though with a less pronounced reduction. Mechanical testing showed consistent reductions in tensile strength, compressive force, and energy dissipation at higher curing temperatures. Fatigue resistance, however, significantly increased, with crack growth slowing by up to 22 times in samples cured at 180°C. The results demonstrate that curing temperature significantly alters the balance between network structure and mechanical performance in sulfur-crosslinked NBR and that rheometric, swelling-based, and MQ-NMR-based descriptors provide complementary information for understanding these effects. • RPA detects temperature-dependent changes in network structure • NMR validates crosslink density trends across curing temperatures • Mechanical properties follow the change in network structure • Higher curing temperature increases crack growth resistance • Fast RPA tests support efficient process evaluation
Hufnagl et al. (Fri,) studied this question.
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