Effect of crosslink density and crosslink distribution on the properties of NR/TBIR blends
The crosslink density and crosslink distribution were adjusted by varying the amount of accelerator/sulfur in the conventional sulfur vulcanization system(CV),semi effective sulfur vulcanization system(SEV),and effective sulfur vulcanization system(EV),and the effect on the application performance of natural rubber(NR)and NR/trans-1,4-(butadiene-isoprene)rubber(TBIR)blends were studied.The results showed that,the crosslink density was the key factor effect the application performance of vulcanizates.The hardness,modulus and wear resistance of NR and NR/TBIR vulcanizates gradually increased,while the elongation at break,fatigue resistance,and rolling resistance gradually decreased with the crosslink density increase in CV,SEV,and EV vulcanization systems.The fatigue resistance of NR and NR/TBIR vulcanizates decreased significantly with the crosslink bonds changed from polysulfide bonds to single sulfur bonds and double sulfur bonds under the same crosslink density.NR/TBIR vulcanizates have better wear resistance,fatigue resistance,and lower rolling resistance compared to NR vulcanizates with the same crosslink density and crosslink distribution.NR/TBIR vulcanizates will have a greater advantage in wear resistance compared to NR vulcanizates when the crosslink density decreases.NR/TBIR vulcanizates will have a greater advantage in fatigue resistance compared to NR vulcanizates when the crosslink density decreases and the proportion of polysulfide bonds increases.
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