Abstract
In order to improve the thermal and mechanical properties of poly(styrene-co-butadiene) (SBR) to use it as a pervaporation membrane in the separation of the azeotropic mixture toluene/methanol, poly(styrene-co-butadiene) crosslinked Maghnia-organo-montmonrillonite (CSBR/OMMT), a nanocomposite of different compositions was first prepared by a solvent casting method. SBR was crosslinked in situ in the presence of OMMT nanoparticles by an efficient vulcanization technique using sulfur as a crosslinking agent and zinc diethyldithiocarbamate as a catalyst. The structure and morphology of the hybrid materials obtained were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscope analysis. The thermal properties of these hybrid materials were studied by differential scanning calorimetry and thermogravimetric analysis/thermal differential analysis. The mechanical properties were studied by strength measurements. The results obtained occurred when the OMMT was incorporated in the CSBR matrix; a significant increase in the glass transition temperature of the SBR was observed which passed from −27 °C for virgin SBR to −21.5 °C for that containing 12 wt% of OMMT. The addition of OMMT nanoparticles to CSBR also improved the mechanical properties of this copolymer. When the OMMT content in the CSBR varied from 0 to 15% by weight, the tensile strength, the elongation at the nose and the modulus at 100% elongation increased from 3.45 to 6.25 MPa, from 162, 17 to 347.20% and 1.75 to 3.0 MPa, respectively. The results of pervaporation revealed that when the OMMT content varied between 3% and 12%, a significant increase in the total flux, the separation factor and the separation index by pervaporation increased from 260.67 to g m−2 h−1, 0.31 to 1.43, and 0.47 to 113.81 g m−2 h−1, respectively.
Highlights
This article is an open access articleStyrene–butadiene rubber (SBR) is mainly synthesized by free radical copolymerization of styrene with butadiene [1,2]
Nanocomposite membranes involving organo-montmorillonite and styrene butadiene rubber (SBR) crosslinked in situ by an efficient vulcanization technique using sulfur as a crosslinking agent and zinc diethyldithiocarbamate as a catalyst have been successfully prepared
The uniform distribution of OMMT nanoparticles in the prepared CSBR/OMMT hybrid materials was confirmed by FTIR, XRD and SEM analysis
Summary
Styrene–butadiene rubber (SBR) is mainly synthesized by free radical copolymerization of styrene with butadiene [1,2]. As can be concluded from these with those of nano-organoclays as a hybrid material are promising in the development investigations, the properties of SBR combined with those of nano-organoclays as a hybrid of selective membrane separation by pervaporation. Such a membrane combines material are promising in the development of selective membrane separation by pervaporation Such a membrane combines excellent film-forming properties with good mechanical stability in many pure solvents or mixtures. A series of crosslinked poly(styrene-co-butadiene) rubber/Maghnia organoclay montmorillonite (CSBR/OMMT) membranes containing different OMMT contents were prepared by a solvent casting method To achieve this goal, organomontmonrillonite or organophylic clay (OMMT) as a filler was synthesized according to the procedure described by Bhattacharya and Aadhar [40]. The effect of OMMT content in the CSBR/OMMT membrane on the fluxes (total and partial), and the separation factor was investigated
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