US EPA

6602216 

Journal Article 

Particle packing in bimodal size carbon black mixtures and its effect on the properties of styrene-butadiene rubber compounds 

Hossain, K; Hajj, RR; Razzaghi-Kashani, M; , 

2019 

1 

Polymer Testing
ISSN: 0142-9418
EISSN: 1873-2348 

ELSEVIER SCI LTD 

OXFORD 

78 

English 

10.1016/j.polymertesting.2019.106002 

WOS:000499943400051 

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85069718476&doi=10.1016%2fj.polymertesting.2019.106002&partnerID=40&md5=0a9472fa47bf09e34b01bc66b1d4ada0
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Particle packing, together with other filler characteristics, can be considered as an important structural parameter of fillers, affecting on the properties of rubber compounds. For this purpose, N220 and N550 carbon blacks with nearly similar structure and surface chemistry but different particle sizes were selected. N220/N550 showed the maximum packed density at the composition 35/65 according to the accepted theory for bimodal packing of spheres. A correlation between the packing behavior of carbon blacks mixtures and physical, electrical and rheological behaviors of filled rubber compounds was investigated. A synergic effect in compounds properties was observed before the vulcanization reaction at the maximum packed composition of carbon-blacks. The synergic effect was attributed to the dense and highly immobilized rubber trapped inside packed structure of carbon blacks aggregates, but it didn't appear for the vulcanizates due to the adverse effect of immobilized rubber on the chemical cross-link density formed during vulcanization reaction. 

Bimodal particle packing; Bound rubber; Carbon black; Filler network; Rheological properties