Styrene‐butadiene‐styrene copolymer compatibilized interfacial modified multiwalled carbon nanotubes with mechanical and piezoresistive properties

Abstract

In this study, styrene‐butadiene‐styrene tri‐block copolymer/multiwalled carbon nanotubes (SBS/MWNTs) were prepared by means of a solution blending method. To enhance the compatibility between SBS and MWNTs, the SBS grafted MWNTs (SBS‐g‐MWNTs) were used to replace MWNTs. The MWNTs were chemically hydroxylated by the dissolved KOH solution with ethanol as solvent and then reacted with 3‐Aminopropyltriethoxysilane (APTES) to functionalize them with amino groups (MWNT‐NH2). The SBS‐g‐MWNTs were finally obtained by the reaction of MWNT‐NH2 and maleic anhydride grafted SBS (MAH‐g‐SBS). The SBS‐g‐MWNTs were characterized by X‐ray photoelectron spectroscopy (XPS), Fourier transform‐infrared spectroscopy (FT‐IR), transmission electron microscopy (TEM), scanning electron microscope (SEM), and thermogravimetric analysis (TGA). The results showed that the SBS molecules were homogeneously bonded onto the surface of the MWNTs, leading to an improvement of the mechanical and electrical properties of SBS/SBS‐g‐MWNTs composites due to the excellent interfacial adhesion and dispersion of SBS‐g‐MWNTs in SBS. A series of continuous tests were carried out to explore the electrical‐mechanical properties of the SBS/SBS‐g‐MWNTs composites. We found out that, near the percolation threshold, the well‐dispersed SBS/SBS‐g‐MWNTs composites showed good piezoresistive characteristics and small mechanical destructions for the development of little deformation under vertical pressure. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42945.

Nanofiller Dispersion, Morphology, Mechanical Behavior, and Electrical Properties of Nanostructured Styrene-Butadiene-Based Triblock Copolymer/CNT Composites

“…Various approaches have been adopted to incorporate CNTs within BCPs to modify the BCP properties [17,18,19,20,21,22,23,24,25], but only a few studies have been able to successfully demonstrate selective CNT localization in one of the BCP phases [26,27,28,29,30]. A more detailed overview of these attempts is given in our previous publication [31].…”

Flexible conductive poly(styrene‐butadiene‐styrene)/carbon nanotubes nanocomposites: Self‐assembly and broadband electrical behavior

“…MWCNTs poses outstanding electrical, mechanical, and thermal properties . Thus, the introduction of MWCNTs into flexible thermoplastic elastomers, such as SBS, to create CPNs have been already explored . For example, Ji et al .…”

Enhanced dielectric properties and energy storage performances by selectively distributed BaTiO3 in polyvinylidene fluoride/low‐density polyethylene blends

“…Compared with BT‐NH 2 , BT@PE shows the similar N:Ba ratio, and the increased C:Ba ratio and C:N ratio. The results reveal the structure of PE grafted to the surface of BT‐NH 2 33 . Because of the reaction of the amino groups of BT‐NH 2 with the MAH groups of PE‐g‐MAH, the atomic ratio of N and Ba keeps constant while the increased C content due to the grafted PE gives rise to the increase ratios of C:Ba and C:N. Figure 3C,D shows the N1s fitting spectra of BT‐NH 2 and BT@PE.…”

“…The results reveal the structure of PE grafted to the surface of BT-NH 2 . 33 Because of the reaction of the amino groups of BT-NH 2 with the MAH groups of PE-g-MAH, the atomic ratio of N and Ba keeps constant while the increased C content due to the grafted PE gives rise to the increase ratios of C:Ba and C:N. Figure 3C,D shows the N1s fitting spectra of BT-NH 2 and BT@PE. The peak at 399.4 eV in the N1 s spectrum of BT-NH 2 is assigned to NH 2 in BT-NH 2 and the peak at 401.5 eV to NH 3 + .…”