Good dispersion and effective interaction of the CNTs with the polymer led to significant mechanical reinforcing effects. The level and type of interfacial interaction might be influenced by functional groups present on filler surface. The presence of CNT reduces swelling as compared with CB, which proves better CNT/polymer interaction than CB. The CNT demonstrated high reinforcement as compared with CB in all types of the investigated elastomers on the base of FKM, NBR and EPDM. At constant moduli the loading using CNTs is factor 5 to 10 lower than using CB in the same polymer. Furthermore the main advantage of the CNT-filled system is the much higher electrical conductivity and the low percolation threshold value, which is increasing in the direction NBR <FKM <EPDM (incl. 50 phr extender oil) <CB-systems.
Authors: H. Chougule, U. Giese (Deutsches Institut für Kautschuktechnologiee.V.)
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