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, natural rubber was purified by saponification of fresh latex from Hevea brasiliensis and soaking process of the coagulum with aqueous NaOH solution.
Abstract: Natural rubber (NR) was purified by saponification of fresh latex from Hevea brasiliensis and soaking process of the coagulum with aqueous NaOH solution. This treatment resulted in the decrease of nitrogen content to the same level as enzymatic deproteinized NR. The saponification of NR latex and soaking of the coagulum gave the rubber having good processability with easy to cure. The saponified rubber showed outstanding physical and dynamic mechanical properties such as high tensile properties, high storage modulus, low tan δ, low heat build-up and low dynamic compression set. The saponified rubber blend with styrene butadiene rubber (SBR) according to the recipe of rubber tire showed also a good performance. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
32 citations
TL;DR: In this paper, the influence of carboxylated styrene-butadiene (SB) latex on the hydration of ordinary Portland cement was investigated by means of isothermal heat flow calorimetry, in-situ X-ray diffraction, electroacoustic zeta potential measurement and ion analysis of the cement pore solution.
Abstract: The influence of carboxylated styrene–butadiene (SB) latex on the hydration of ordinary Portland cement was investigated by means of isothermal heat flow calorimetry, in-situ X-ray diffraction, electroacoustic zeta potential measurement and ion analysis of the cement pore solution. In particular, to assess the influence of the spraying aids polyvinyl alcohol (colloidal stabilizer) and kaolin (anti-caking agent) on cement hydration, the impact of the liquid SB latex was compared with that of its re-dispersible powder. It was found that anionic SB generally retards both the aluminate and silicate reactions. This effect can be ascribed to adsorption of SB particles onto positively charged clinker or hydrate phases and the chelation of calcium ions present in cement pore solution by the carboxylate groups of the SB sample. SB powder exhibits a lower anionic charge density due to PVOH coating, thus interacts less strongly with cement and retards slightly less, compared to liquid SB latex.
32 citations
Patent•
16 Apr 1979
TL;DR: Paper coating compositions having an improved combination of properties are prepared by admixing, in the normal proportions and by conventional techniques, one or more conventional paper coating pigments with a particular type of synthetic polymer latex.
Abstract: Paper coating compositions having an improved combination of properties are prepared by admixing, in the normal proportions and by conventional techniques, one or more conventional paper coating pigments with a particular type of synthetic polymer latex. In such compositions, the particular latex employed is alkali-sensitive and is prepared by emulsion polymerizing (A) from about 10 to about 90 parts by weight of a monomer mixture comprising, based upon the weight of such monomer mixture, (1) from about 10 to about 60 weight percent of an ethylenically unsaturated carboxylic acid monomer and (2) from about 40 to about 90 weight percent of a copolymerizable monoolefin compound in the presence of (B) from about 10 to about 90 parts by weight, on a polymer solids basis, of a copolymer latex comprising a monovinylidene aromatic monomer such as styrene and an open-chain aliphatic conjugated diene such as butadiene.
32 citations
TL;DR: In this article, a peroxyformic acid generated in situ appears to be simple and practical for the epoxidation of styrene-butadiene block polymers in cyclohexane.
Abstract: Epoxidation of styrene–butadiene block polymers considerably improves their resistance to hydrocarbon oils. Use of peroxyformic acid generated in situ appears to be simple and practical. Although no problems exist when the reactions are carried out in toluene, polymer molecular weight and reactant stoichiometry are important in determining the properties of polymers epoxidized in cyclohexane. In fact, epoxidations in cyclohexane of linear and tapered block polymers of molecular weights in excess of 60,000 with peroxyformic acid invariably lead to gelation. Replacing half or more of formic acid with acetic acid, however, alleviates the problem without adversely affecting the tensile or oil resistance of the resulting polymers. This recipe has also been successfully applied to the epoxidation of divinylbenzene-coupled styrene–butadiene radial block polymers.
32 citations
TL;DR: In this article, the influence of the silica treatment on the mechanisms involved is explored with sample carefully characterised and with the same filler dispersion, and it is shown that the coupling agent delays void formation in the samples and leads at intermediary strain to reorganisation of the filler structure while the covering agent eases the void formation which also occurs without silica surface treatment.
Abstract: Original in situ measurements of volume variation and small angle light scattering (SALS) are performed on silica filled Styrene Butadiene Rubber (SBR) during tensile tests. The influence of the silica treatment on the mechanisms involved is explored with sample carefully characterised and with the same filler dispersion. Two different types of silane are used as treatment, an alkoxy silane (so called covering agent) and a coupling agent which enables covalent bonds between the silica and the polymer matrix. It is shown that the coupling agent delays void formation in the samples and leads at intermediary strain to the reorganisation of the filler structure while the covering agent eases the void formation which also occurs without silica surface treatment.
32 citations