Structure and property of tetrafluoroethylene‐propylene elastomer‐OVPOSS composites

Abstract

Tetrafluoroethylene-propylene elastomer-octavinyl-polyhedral oligomeric silsesquioxane (TFE/P-OVPOSS) composites containing various percentages of OVPOSS are prepared via room temperature milling and heat vulcanization at 170 C. The composites are characterized by FTIR, 13 C-NMR, 29 Si-NMR, XRD, DSC, SEM, tensile test, DMA, and TGA. The crosslink bond formation between TFE/P and OVPOSS conforms to the structural characterization of the composites. The OVPOSS cages aggregate when the OVPOSS dosage is more than 6 as observed from the XRD curves and SEM images. The swelling test shows that the experimental crosslink density is lower than the calculated crosslink density, indicating that not all reacted vinyl groups are converted into crosslink bonds. Meanwhile, the incorporation of OVPOSS significantly enhances the mechanical property and elevates the glass temperature of the composites. However, the thermal property is only improved slightly.

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

“…Thus, stable crosslinks between the coagent and the macromolecule main chain can build up through these double bonds. Octavinyl polyhedral oligomeric silsesquioxane features several double bonds and is also used as a coagent for FEPM …”

“…Octavinyl polyhedral oligomeric silsesquioxane features several double bonds 13 and is also used as a coagent for FEPM. 14 High-vinyl polybutadiene rubber (HVBR) possesses a highly active allyl hydrogen, which is also a tertiary hydrogen. In the literature, an addition 15 or graft reaction 16 is presumed to be the main reaction mechanism for the reaction between a coagent and a polymeric material.…”