A Novel Thermotropic Elastomer based on Highly‐filled LDH‐SSB Composites

Abstract

Elastomeric composites are prepared based on solution styrene butadiene elastomer and zinc-aluminium layered double hydroxides (LDH), using a conventional sulphur cure system. Up to 100 parts per hundred rubber of LDH are incorporated into the elastomer matrix. The composites exhibit an interesting phenomenon of thermoreversible transparency, i.e. the transparent sample becomes opaque at warm condition and restores the transparency at room temperature. The transparency is found to be increased as the amount of LDH was increased. The addition of LDH gradually improved the mechanical, dynamic mechanical performance and thermal stability of the base elastomer. These developped elastomers could be utilised as smart materials in different applications.

Ionic elastomers based on carboxylated nitrile rubber (XNBR) and magnesium aluminum layered double hydroxide (hydrotalcite)

“…Optical transparency, which can be a desirable characteristic, was not observed in case of XZnO5 composite that was opaque. The transparency of rubber composites filled with LDHs has already been reported for NBR vulcanized with sulfur [10] and SSBR also vulcanized using a conventional sulfur cure system [17]. Figures 5 and 6 show the ATR spectra of the sample without crosslinking agent (XNBR pure), the sample cured with ZnO (5 phr) and crosslinked with various amounts of HT (5, 10, 20 and 30 phr) at 160°C.…”

“…Ionic elastomers based on carboxylated nitrile rubber (XNBR) and magnesium aluminum layered double hydroxide (hydrotalcite) [5][6][7][8][9], acrylonitrile-butadiene rubber (NBR) [10], chloroprene rubber (CR) [11], silicone rubber (SR) [12,13], and polyurethane PU [14][15][16] and solution styrenebutadiene rubber (SSBR) [17]. However, in the literature, there is no information on the impact of high loadings of unmodified magnesium aluminum layered double hydroxide used as a filler and a curing agent on the crosslinking process in XNBR.…”

Nitrile Elastomer/LDH Composites with Varying Mg/Al Ratio, Curing, Nanoparticles Dispersion and Mechanical Properties

“…Using a solution styrene-butadiene elastomer SSBR smart, thermotropic materials based on Zn-Al-LDH filler were obtained [64]. Thermotropic materials are defined as materials able to change reversibly from being transparent to a milky white (refractive) state as a function of temperature.…”

Revealing the three-dimensional filler structure in a rubber matrix based on fluorescein modified layered double hydroxides

“…21 Moreover, LDH as a potential material in elastomer technology has attracted intense research interest due to their application in reinforcement, vulcanization, ame retardant and so on. 2,[22][23][24] Even though, up to now, the reports on rubber-LDH composites are still quite limited and their dynamic properties have seldom been reported, not to say the systematic investigation combined the rheological behavior with direct evidence of ller structural evolution under loading.…”