Rheological behavior of nanocomposites of natural rubber and carboxylated styrene butadiene rubber latices and their blends

Abstract

Flow behavior of latices is industrially important for the manufacturing of various latex goods. Rheology of latices having fillers can assist in the understanding and quantification of the matrix-filler interaction. The impact of layered silicates such as sodium bentonite and sodium fluorohectorite on the rheological behavior of natural rubber, carboxylated styrene butadiene rubber latices, and their blends was analyzed with special reference to shear rate, temperature, and filler loading. The layered silicatesreinforced latex samples were characterized by X-ray diffraction technique to analyze the extent of intercalation and exfoliation. In the presence of layered silicates, latex systems exhibited enhancement in viscosity due to the network formation. Because of the breaking of networks at higher temperature, the viscosity of all systems decreased with increase in temperature. Layered silicates-reinforced latex systems showed pseudoplastic flow behavior and possesses enhanced zero shear viscosity and yield stress.

Mechanical and thermal properties of crab chitin reinforced carboxylated SBR composites

“…Heating at this temperature is also likely to promote filler flocculation, as proposed in [24], to modify their geometry and evaluate the effect of this treatment on the mechanical properties. The flocculation effect for the filler has been revealed for equivalent systems in [9], demonstrating that even the addition of a few weight percent of synthesized clays, up to 2.5% of unmodified fluorohectorite, produces a slight but perceivable decrease of the viscosity. Table 2 summarized all the studied materials with their composition.…”

“…In particular, they are likely to reduce the amount of swelling due to absorption in membranes [7], and can allow SBR to compete with vulcanised rubber, in that their reinforcing capability, depending on the aspect ratio of the chitin, can be comparable to the traditional inorganic nanofillers e.g., clay [8]. In addition, the compatibilization efficiency of styrenebutadiene matrices generally depends on the conditions of blend preparation and processing [9]. In particular, thermal annealing of rubber blends results often in a substantial hardening of the material, which is capable of providing a stronger interface for the possible introduction of reinforcement in the rubbery matrix [10].…”

“…It has been suggested that this loss of performance is due to the partial destruction of the aforementioned three-dimensional network of chitin whiskers assumed to be present in the unmodified composites [16]. This work concentrates on the study of the mechanical and thermal properties of composites with crab chitin introduced into an XSBR latex: a number of studies of these properties for the pure unvulcanized matrix are available, in particular [9,[17][18][19][20]. This study does also include the degradation scenario of these composites, in particular measuring their dynamical properties, their creep profile, their temperature degradation and their swelling by toluene absorption.…”

Synthesis and characterization of in situ sodium‐activated and organomodified bentonite clay/styrene–butadiene rubber nanocomposites by a latex blending technique

“…Potential application areas suggested by Wang et al 19 for these nanocomposites were as inner tubes, inner liners, and dumpers. Stephen et al 20 studied the impact of layered silicates such as sodium bentonite and sodium fluorohectorite on the rheological behavior of NR, carboxylated styrene-butadiene rubber (SBR) latices, and their blends with special reference to shear rate, temperature, and filler loading. Zhang et al 21 prepared clay (natural clay fractionated from bentonite)/SBR nanocomposites by mixing SBR latex with a clay/water dispersion and coagulating the mixture.…”

Effect of treatment of Bis(3‐triethoxysilyl propyl)tetrasulfane on physical property of in situ sodium activated and organomodified bentonite clay – SBR rubber nanocomposite

“…Wang et al 15 prepared NR-MMT and chloroprene rubber (CR)-MMT clay nanocomposites by co-coagulating the rubber latex and the aqueous clay suspension. Stephen et al 16 studied the impact of layered silicates like sodium bentonite and sodium fluorohectorite on the rheological behavior of NR, carboxylated SBR (XSBR) lattices, and their blends with special reference to shear rate, temperature, and filler loading. Zhang et al 17 prepared clay (natural clay fractionated from bentonite)-SBR nanocomposites by mixing the SBR latex with a clay/water dispersion and coagulating the mixture.…”