Vulcanization Rubber 48 Curing 26 Crosslinking 24 Sulfur 20 Styrene 18 Styrene butadiene rubber 18 Swelling 18 Rheometers 14 Butadiene 12 Cross-link densities 12 Polybutadienes 12 Positron annihilation spectroscopy 12 Crosslink density 10 Differential scanning calorimetry 10 Mathematical models 10 Polybutadiene rubber 10 Polybutadiene rubbers 10 Vulcanization process 10 Elasticity 8 Glass transition 8 Kinetics 8 PALS 8 Positron annihilation lifetime spectroscopy 8 Sulfenamides 8 Activation energy 6 Correlation methods 6 Cu-Re system 6 Cure temperature 6 Elastomers 6