Topic
Styrene-butadiene
About: Styrene-butadiene is a research topic. Over the lifetime, 5568 publications have been published within this topic receiving 62099 citations. The topic is also known as: styrene-butadiene rubber & SBR.
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TL;DR: In this paper, a dual role of nano-silica nanofiller in styrene-butadiene rubber (SBR) has been investigated and a mechanistic scheme involving dual function of this nano-filler has been suggested.
Abstract: The use of ZnO and stearic acid is very well known in sulfenamide accelerated sulfur vulcanization of diene elastomers. Zn-ion coated nano filler has been developed and tested, in styrene-butadiene rubber (SBR) as sulfur vulcanizing activator cum reinforcing filler. In this study Zinc oxide has been replaced by the Zn-ion coated nano silica filler with an aim to study the dual role of this nanofiller in SBR. The presence of Zn-ion on the nano silica filler surface activates the sulfur vulcanization by involving Zn++ in to the sulfurating complex formed with thiazole from sulfenamide. The increase of Zn-ion, on the nanofiller, decrease the scorch safety of the elastomer compound but increase the tensile strength, state of cure and tear strength and attain maximum at its 10% level. The presence of stearic acid increases the rate of vulcanization. Replacement of stearic acid with mono-stearate, however, increases the vulcanization rate but decrease the ultimate state of cure. A mechanistic scheme involving dual function of this nanofiller has been suggested.
22 citations
TL;DR: In this article, improvement of properties of silica-filled styrene-butadiene rubber (SBR) compounds has been studied using emulsion SBR-based acrylonitrile-structure-butane rubber (NSBR).
Abstract: Since silica has strong filler–filler interactions and adsorbs polar materials, a silica-filled rubber compound wil have poor dispersion of the filler and a poor cure characteristic. Improvement of properties of silica-filled styrene-butadiene rubber (SBR) compounds has been studied using emulsion SBR-based acrylonitrile-styrene-butadiene rubber (NSBR). The silica dispersion is improved by adding NSBR to the compound. The bound rubber content increases with increase in the NSBR content. The scorch time and cure rate become faster as the NSBR content increases. The crosslink density also increases by increasing the NSBR content. The wear property is improved by adding the NSBR. Copyright © 2003 John Wiley & Sons, Ltd.
22 citations
Patent•
01 Feb 1983
TL;DR: In this article, a styrene-butadiene copolymer is obtained by adding a Lewis base to a polymerization system in which styrene is copolymersized with butadiene in a hydrocarbon solvent by using an organolithium compound as a polymerisation initiator.
Abstract: PURPOSE: To obtain a styrene-butadiene copolymer of improved resilience and heat build-up resistance, by copolymerizing styrene with butadiene in the presence of a Lewis base under a specified condition and adding a polyfunctional coupling agent to the product. CONSTITUTION: The purpose copolymer is obtained by adding a Lewis base to a polymerization system in which styrene is copolymerized with butadiene in a hydrocarbon solvent by using an organolithium compound as a polymerization initiator; initiating the copolymerization of the styrene with a portion of the butadiene to be added; continuously or intermittently adding the remaining portion of the butadiene to be added, in such a way that the styrene monomer content of the monomer component in the polymerization system is always maintained at a value which is at most twice the bound styrene content of the copolymer finally produced till the conversion to the polymer reaches 98wt%; and adding a polyfunctional coupling agent after completion of the copolymerization. COPYRIGHT: (C)1984,JPO&Japio
22 citations
TL;DR: In this article, the effect of different zinc oxide types on ageing properties of SBR compounds was investigated and the changes in tensile properties, hardness and rebound resilience were followed and evaluated.
22 citations
TL;DR: In this paper, the effects of fiber loading and different loading of nanoclay (1, 3 and 5 wt. %) were studied on the microstructure and mechanical properties of the nanocomposites.
Abstract: Natural rubber and styrene butadiene rubber (NR/SBR) reinforced with both short nylon fibers and nanoclay (Cloisite 15A) nanocomposites were prepared in an internal and a two roll-mill mixer by a three-step mixing process. The effects of fiber loading and different loading of nanoclay (1, 3 and 5 wt. %) were studied on the microstructure and mechanical properties of the nanocomposites. The adhesion between the fiber and the matrix was improved by the addition of a dry bonding system consisting of resorcinol, hexamethylene tetramine and hydrated silica (HRH). This silicate clay layers was used in place of hydrated silica in a HRH bonding system for SBR/NR-short nylon fiber composite. Nanoclay was also used as a reinforcing filler in the matrix-short fiber hybrid composite. The cure and scorch times of the composites decreased while cure rate increased when the short fiber and nanoclay were added. The mechanical properties of the composites showed improvement in both longitudinal and transverse directions with increasing short fiber and nanoclay content. The structure of the nanocomposites was characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM). X-ray diffraction results of nanocomposites indicated that the interlayer distance of silicate layers increased. The mechanical properties of nanocomposites (tensile, hardness and tear strength) are examined and the outcome of these results is discussed in this paper.
22 citations