Study On Dynamic Mechanical Properties Of NR And S-SBR Composites

Dynamic mechanical analysis (DMA) was employed to estimate dynamic mechanical properites of NR, S-SBR composites reinforced by CB, silica and short fiber, study the effects of reinforced materials' kinds and contents on dynamic mechanical properties of NR and S-SBR composites, related physical mechanical properies were investigated also.To Carbon black (CB) (N234, N330, N660) reinforced NR and S-SBR, physical mechanical properies of NR, especially S-SBR were improved evidently by the adding of CB, thereinto, the general properties of vulcanizates reinforced N330 were better. DMA estimating results revealed that tan δ_max of vulcanizates reduced along with the content of CB increased or the diameter of CB decreased, but tan δ at 70℃ increased.Experiments results revealed that physical mechanical properies of NR, S-SBR were improved evidently by the adding of silica ( Z125, Z1165MP, Z195), thereinto, the general physical mechanical properties of vulcanizates reinforced Z 1165MP were better.The gape expanding abilities of NR was improved by adding silica, however, S-SBR's was controled greatly. Experiments results revealed that with the silica content increasing, tan δ_max of vulcanizates minished, tan δ at 0℃ and 70 ℃ increased, E' of NR vulcanizates increased also, and E' of S-SBR vulcanizates changed little. Thereinto, NR filled Z1165 and S-SBR filled Z195 had better dynamic mechanical properties. With similar CTAB, contrast with N234, NR and S-SBR filled Z125 had lower tan 6 both at 0℃ and 70℃, and had smaller E' when the temperature was below 25 ℃ but bigger E' when it beyond 25℃.To short fiber-rubber composite (SFRC) system, experiment results revealed that after CB was replaced partly by silica, short fiber which in the parallel direction...