Abstract
AbstractThe work deals with the preparation and characterization of elastomer/multiwalled carbon nanotube (CNT) composites. Nitrile‐butadiene‐rubber (NBR), emulsion styrene‐butadiene‐rubber (E‐SBR) with random segment distribution, and solution styrene‐butadiene‐rubber (S‐SBR) having a blocked styrene content were used as elastomer matrix. The preparation of composites by a masterbatch process was compared to the direct melt‐mixing process using two different types of multiwalled CNT. It turned out that extremely low‐percolation thresholds of ∼0.2 and 1 wt% CNT can be reached by direct melt mixing of Nanocyl 7000 CNT with S‐SBR and NBR, respectively. The effect of CNT on the vulcanization reaction was studied by application of a first‐order kinetic model. It can be shown that the rate constants are decreasing with increasing CNT content especially at higher reaction temperatures and that CNT cause a decrease in activation energies. Temperature scanning stress‐relaxation measurements were used to prove the reinforcing effect of the CNT, to verify the phase structure of the S‐SBR, and to estimate the effect of CNT on crosslink density. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers
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