Viscoelastic and gelation studies of SEBS thermoplastic elastomer in different hydrocarbon oils

Kim, Jin Kuk; Paglicawan, Marissa A.; Balasubramanian, Maridass

doi:10.1007/bf03219096

Cited by 35 publications

(33 citation statements)

References 25 publications

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“…While numerous fundamental studies on the rheological and morphological properties of molecular networks composed of a microphase-separated multiblock copolymer swollen to a large extent by a low-volatility midblockselective solvent, [11][12][13][14][15] few comparable efforts have extended studies to thermoplastic elastomer gels in the presence of multiwalled carbon nanotubes (MWCNTs). The aim of this article is to determine the effect of MWCNTs on the rheological, thermal, mechanical and morphological properties of NCTPEGs from microphaseordered poly(styrene-b-(etheylene-co-butylene)-b-styrene (SEBS) dissolved in hydrocarbon oil properties.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of multiwalled carbon nanotubes in thermoplastic elastomer gels: Morphological, rheological, and electrical properties

2009

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An investigation was reported here with an aim to prepare nanocomposite thermoplastic elastomer gels by dissolving polystyrene-b-poly(ethylene/butylene)-b-polystyrene (SEBS) triblock copolymer in selective hydrocarbon oils with the presence of multiwalled carbon nanotubes (MWCNTs). The properties related to morphology, viscoelasticity, electrical and mechanical properties, and thermal stability were explored and discussed. Dynamic rheological measurements of the resultant nanocomposite thermoplastic elastomer gels (NCTPEGs) confirmed that addition of MWCNTs affects the linear viscoelastic properties in which dynamic storage and loss moduli increase to some extent. At a temperature between 308C and 408C below the gel point the NCTPEGs have dynamic storage modulus greater than loss modulus (G 0 and G 00 ), thereby indicating that at room temperature a physical network is still present despite the addition of MWCNTs. The morphological properties revealed that MWCNTs were dispersed and exfoliated within the swollen TPE. The incorporation of small quantity of MWCNTs improved the thermal stability and mechanical properties of NCTPEGs. POLYM. COMPOS.

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Section: Introductionmentioning

confidence: 99%

Dispersion of multiwalled carbon nanotubes in thermoplastic elastomer gels: Morphological, rheological, and electrical properties

2009

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“…This technique allows obtaining high overall regression rate values, even in lab-scale facilities [11,12].…”

Section: Fuel Formulations and Experimental Methodsmentioning

confidence: 99%

Experimental investigation of paraffin-based fuels for hybrid rocket propulsion

Galfetti

Merotto

Boiocchi

et al. 2013

Progress in Propulsion Physics

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Solid fuels for hybrid rockets were characterized in the framework of a research project aimed to develop a new generation of solid fuels, combining at the same time good mechanical and ballistic properties. Original techniques were implemented in order to improve para©n-based fuels. The ¦rst strengthening technique involves the use of a polyurethane foam (PUF); a second technique is based on thermoplastic polymers mixed at molecular level with the para©n binder. A ballistic characterization of para©n-based hybrid rocket solid fuels was performed, considering pure wax-based fuels and fuels doped with suitable metal additives. Nano-Al powders and metal hydrides (magnesium hydride (MgH 2 ), lithium aluminum hydride (LiAlH 4 )) were used as ¦llers in para©n matrices. The results of this investigation show a strong correlation between the measured viscosity of the melted para©n layer and the regression rate: a decrease of viscosity increases the regression rate. This trend is due to the increasing development of entrainment phenomena, which strongly increase the regression rate. Addition of LiAlH 4 (mass fraction 10%) can further increase the regression rate up to 378% with respect to the pure HTPB regression rate, taken as baseline reference fuel. The highest regression rates were found for the Solid Wax (SW) composition, added with 5% MgH 2 mass fraction; at 350 kg/(m 2 s) oxygen mass §ux, the measured regression rate, averaged in space and time, was 2.5 mm/s, which is approximately ¦ve times higher than that of the pure HTPB composition. Compositions added with nanosized aluminum powders were compared with those added with MgH 2 , using gel or solid wax.

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“…Poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) gels are a class of thermoreversible gels with a large application in industry 4 . These copolymer-in-oil gels have been proposed as material for ultrasound elasticity imaging 5 , where the authors verified acoustic and mechanical properties in good agreement with that found in soft tissues.…”

Section: Introductionmentioning

confidence: 99%

Oil-based gel phantom for ultrasound and optical imaging

Cabrelli¹,

Pelissari²,

Aggarwal³

et al. 2015

Biophotonics South America

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Water-based materials are commonly used in phantoms for ultrasound and optical imaging techniques. However, these materials have disadvantages such as easy degradation and low temporal stability. In this study, we propose an oil-based new tissue mimicking material for ultrasound and optical imaging, with the advantage of presenting low temporal degradation. Styrene-Ethylene/Butylene-Styrene (SEBS) copolymer in mineral oil samples were made varying the SEBS concentration between 5─15%, and low-density polyethylene (LDPE) between 0−9%. Acoustic properties such as speed of sound and attenuation coefficient were obtained by the substitution technique with frequencies ranging from 2.25─10 MHz, and were consistent to that of soft tissue. These properties were controlled varying SEBS and LDPE concentration; speed of sound from 1445─1480 m/s, and attenuation from 0.86─11.31 dB/cm were observed. SEBS gels with 0% of LDPE were optically transparent, presenting low optical absorption and scattering coefficients in the visible region of the spectrum. In order to fully characterize the optical properties of the samples, the reflectances of the surfaces were measured, along with the absorption. Scattering and absorption coefficients ranging from 400 nm to 1200 nm were calculated for each compound. The results showed that the presence of LDPE increased absorption and scattering of the phantoms. The results suggest the copolymer gels are promising for ultrasound and optical imaging, what make them also potentially useful for photoacoustic imaging.

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Viscoelastic and gelation studies of SEBS thermoplastic elastomer in different hydrocarbon oils

Cited by 35 publications

References 25 publications

Dispersion of multiwalled carbon nanotubes in thermoplastic elastomer gels: Morphological, rheological, and electrical properties

Dispersion of multiwalled carbon nanotubes in thermoplastic elastomer gels: Morphological, rheological, and electrical properties

Experimental investigation of paraffin-based fuels for hybrid rocket propulsion

Oil-based gel phantom for ultrasound and optical imaging

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