Properties of styrene-ethylene-butylene styrene block copolymer/exfoliated graphite nanoplatelets nanocomposites

Abstract

Three different types of styrene-ethylene-butylene-styrene block copolymer (SEBS) with varying ratios of styrene and rubber were melt-compounded with exfoliated graphite nanoplatelets at different loadings. The morphological, thermal, and mechanical properties of the nanocomposites were studied and compared. Morphological observation under SEM and AFM found that the xGnPs were dispersed at the sub-micron level throughout the SEBS matrix. Good interfacial adhesion between the xGnPs and the matrix was also observed. However, the behavior of dispersion was dependent on the styrene/rubber content. SEBS with higher styrene content showed better dispersion and strong interfacial adhesion between the xGnPs and SEBS matrix. These results contributed to the enhancement of the tensile strength of the nanocomposites. Low styrene content behaved like rubber that resulted in low tensile strength but higher elongation compared to SEBS of different amounts of styrene. The XRD patterns indicated that the melt compounding process did not change the d-spacing of xGnPs in all types of SEBS. From the thermal analysis, there was no change in the glass transition of the polymer and no improvement in the thermal stability of the nanocomposites.

Carboxylated Polystyrene-b-poly(ethylene-ran-butylene)-b-polystyrene Membranes for Alkaline Water Electrolysis

“…The X-ray diffraction (XRD) patterns of SEBS and the different carboxylated SEBS membranes in the dry form and after equilibration in 15 wt % KOH are shown in Figures a and b, respectively. In the dry state, all samples were found to be amorphous, with a distinct peak at around 2θ = 18.5° for pristine SEBS as well as for S4-M and S5-M. For S4-M s and S5-M s , it was around 2θ = 17.5°, which is characteristic of the SEBS matrix . Unlike the other samples, pristine SEBS exhibited an additional broad halo peak at 2θ = 11.8°, which was not observed after functionalization.…”

Valorization of Starch to Biobased Materials: A Review

“…Copolymers (ex-situ), reactive graft polymers (in situ), and radical processing are the three main paths for this procedure (dynamic vulcanization). Thermoplastic elastomers, such as styrene-ethylene-butene-styrene block copolymer (SEBS) and ethylene-propylene-diene (EPDM), have been used for compatibilization [ 241 , 242 ]. Reactive copolymers on immiscible polypropylene (PP)–polystyrene (PS) blends with varying PS concentrations using mechanical (tensile and tensile impact), rheological (melt flow rate, extensional and dynamic rheology), and morphological (scanning electron microscopy) analysis (10 wt.…”

Synthesis and characterization of zwitter ion functionalized Poly(styrene) based random co-polymer: One pot method

“…Polyurethane-styrene triblock copolymer was reported in the literature [28] . Ethylene-styrene copolymer [29] , vinylboronicacid-styrene copolymer [30] , styrene-isoprene [31] , butylene-styrene copolymer [32] , styrene-4-vinylpyridine copolymer [33] , and poly(styrene)-blockpoly(isoprene) [34] copolymer were reported in the literature. There is no literature on amine and acid functionalized styrene as a co-monomer with the polymerization of styrene.…”