Improvement in oil resistance of room temperature-vulcanized polysiloxane rubber via blending with self-synthetic fluorosilicone

Abstract

In this work, different contents of vinyl-terminated fluorosilicone oil (VFS oil) were blended with room temperature-vulcanized (RTV) polydimethylsiloxane (PDMS). Via rheological detection, the addition of VFS oil could increase the viscosities of VFS/PDMS/silicon dioxide (SiO2) blends, probably due to the interaction between incorporated fluorine atom and silanol on the surfaces of SiO2. The additional “structuring effect” was reduced by enhancing the shearing rate of the mixed gums containing VFS oil and the obvious shear-thinning property was helpful for enhancing the processability. The curing process and cross-linking degree test of VFS/PDMS/SiO2 blends suggested that the VFS oil could reduce the curing time and the induction time, but did not play a positive role in the cure depth using a platinum catalyst. Mechanical property tests showed that the VFS oil did not increase the tensile strength and elongation at break, and the hardness slightly decreased with increasing VFS oil content. The oil resistance property test showed that the oil resistance of the polysiloxane rubber was well improved by the incorporation of the VFS oil containing the functional group –CH2CH2CF3.