Premium
Different preparative modes for the incorporation of additives in NR/SBR blends
Author(s) -
Visconte Leila L. Y.,
Martins Agnes F.,
Suarez João C. M.,
Nunes Regina C. R.
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20315
Subject(s) - vulcanization , natural rubber , elastomer , materials science , tear resistance , ultimate tensile strength , composite material , styrene butadiene , compounding , polymer , phase (matter) , sulfenamide , dispersion (optics) , composite number , polymer blend , styrene , chemistry , copolymer , organic chemistry , physics , optics
Rubber goods usually require a combination of properties that cannot be provided by one elastomer only and then two or more polymer components have to be mixed to meet specific requirements. In such cases, the additives normally employed in rubber formulations are unevenly distributed, depending on the affinity of each compound to each polymeric phase. Thus, the dispersion of each one of these ingredients in the different rubbers will influence the rate and degree of vulcanization and, in consequence, the performance of the final composite. In this work, natural rubber (NR) and styrene butadiene rubber (SBR) were mixed in a 1 : 1 ratio. The compositions were obtained according to ASTM D 3182, by using four different preparative modes for the incorporation of the additives. After vulcanization, morphological, and dynamic mechanical thermal analysis, tensile strength, hardness, and tear resistance of each composition were investigated. The results show that the best properties were found when the NR/SBR mixture was prepared in such a way as to favor the vulcanization of the SBR phase while preserving the NR phase from excessive vulcanization. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 483–489, 2004