Microstructure and properties of fluoroelastomer/butadiene-acrylonitrile rubber interpenetrating polymer networks

Abstract

Interpenetrating polymer networks (IPNs) based on fluoroelastomer/ butadiene-acrylonitrile rubber (FKM/NBR) by molten blending at a high temperature and chemical cross-linking of two components were prepared. The influence of the two networks component on the mechanical properties and thermostabilities was studied. The experimental results show that the mechanical properties of the IPNs are superior to those of the individual FKM and NBR networks due to forming the case of interpenetrating and intercross-linking between the two networks, the mechanical properties and thermal resistance exhibit higher values when 80/20 (w/w) FKM and NBR is blended and respectively cured simultaneously. The co-continuous morphology of the IPNs in the blends of 80/20 (w/w) FKM/NBR is found by transmission electron microscopy (TEM), the differential scanning calorimetry (DSC) determination shows that the blends of 80/20 (w/w) FKM/NBR have better compatibility, and the glass transition temperature of the elastomer is -21.5 ℃.

Preparation and properties of alkaline anion exchange membrane with semi‐interpenetrating polymer networks based on poly(vinylidene fluoride‐co‐hexafluoropropylene)

“…As depicted in Figures and , QPBV/P(VDF‐HFP) AAEMs with s‐IPN structure were prepared using P(VDF‐HFP) as the fluorine‐containing polymer matrix. P(VDF‐HFP) is an excellent fluorine‐containing elastomer having good heat, oil and chemical resistance, and can be chemically crosslinked as a network using hexafluorobisphenol A (bisphenol AF) and BPP as the crosslinker and cocrosslinker . The vulcanization process of QPBV/P(VDF‐HFP) blends were determined by Monsanto rheometer at 170 °C.…”

“…The properties of QPBV‐P(VDF‐HFP) s‐IPN AAEMs can be explained by the phase morphology developed during preparation. Figure are the TEM of M‐a, M‐b, and M‐c samples, the dark regions correspond to the imidazolium ionic clusters, and the bright domains correspond to the CF chain structures, that is, dark QPBV domains exist in the bright domains of P(VDF‐HFP), since QPBV can be stained with OsO 4 solution, whereas P(VDF‐HFP) cannot . Figure (a) is the TEM of M‐a samples, QPBV is mostly dispersed in the continuous P(VDF‐HFP) matrix.…”

“…The crosslinking process was operated by a hydropress at 170 °C for 15 min. P(VDF‐HFP) was crosslinked reaction with bisphenol AF, an s‐IPN membrane based on QPBV/P(VDF‐HFP) was prepared with a uniform thickness around 0.12 mm, then some s‐IPN membranes were prepared by using 50/50, 60/40, and 70/30 of QPBV/P(VDF‐HFP) ratios (wt/wt). The obtained membranes were further soaked in 6 M potassium hydroxide solution for 24 h to exchange chloridion into hydroxyl ion.…”

“…In this work, we report the fabrication of a novel AAEM with s‐IPN based on poly(vinylidene fluoride‐ co ‐hexafluoropropylene) [P(VDF‐HFP)] as fluorine‐containing polymer matrix. P(VDF‐HFP) can be chemical crosslinked as a network using 4,4′‐(hexafluoroisopropylidene)diphenol (bisphenol AF) and benzyl triphenyl phosphonium chloride (BPP) as the crosslinker and cocrosslinker . A copolymer of butyl acrylate (BA) and VBC, namely poly(butyl acrylate‐ co ‐vinylbenzyl chloride) (PBV), was synthesized by emulsion polymerization, followed by quaternary amination.…”

Role of vinyl thiethoxy silane grafted onto fluororubber in compatibilization of fluororubber and silicone rubber blends

“…4 FKM is well known for its resistance to heat and aggressive fluid. [5][6][7] However, FKM has lack of low temperature resistance and is not easy to be processed due to its high Mooney viscosity. MVQ exhibits high temperature stability, low temperature flexibility, chemical resistance, weatherability and electrical properties except for its poor oil resistance.…”