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Showing papers on "Styrene-butadiene published in 1987"


Journal ArticleDOI
TL;DR: In this article, the authors investigated the change in the order disorder transition temperature of block copolymer, induced by the addition of homopolymer, based on the random phase approximation.
Abstract: : The change in the order disorder transition temperature of block copolymer, induced by the addition of homopolymer, is investigated. Analysis of the theoretical expression based on the random phase approximation shows that the direction of the change in the transition temperature is determined by the length of the added homopolymer in relation to the length of the block copolymer and the overall composition of the monomers in the mixture. Small-angle x ray scattering measurements are performed with mixtures containing a styrene butadiene diblock copolymer and a polystyrene of various molecular weight. The observed shape of the scattered intensity curve, the angular position of the peak intensity, and the spinodal temperature for the micro-phase separation all agree well with the prediction from the theory. The values of the interaction energy density determined from the results agree fairly well with values determined previously from cloud point data. Keywords. Block copolymer, Order disorder transition, Miscibility, Polystyrene, Styrene butadiene block copolymer, Small angle X ray scattering.

49 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of silane coupling agent (A-174) on the properties of composites from mica and styrene-butadiene rubber (SBR) was investigated.
Abstract: Physical properties of composites from mica and styrene-butadiene rubber (SBR) have been studied with special reference to the effect of silane coupling agent (A-174) in the compound. Tensile and tear properties increase with the addition of mica. The increase of tensile properties in more pronounced in the case of silane-treated mica. Silane treatment also raises the volume fraction of rubber in solvent-swollen rubber vulcanizate. Attempts have been made to correlate the changes in properties with the network structure of rubber. In order to understand the mechanism of failure, tensile fracture surfaces have been examined by scanning electron microscopy (SEM). The fractographs have been correlated with the strength and type of failure of these composites. The observed values of viscosity (rheometric) correspond to the calculated values from existing theory based on the hydrodynamic model of dispersed particles in a fluid medium.

20 citations


Patent
27 Jul 1987
TL;DR: A branched polysiloxane styrene butadiene polymer of the following formula is described in this article, where m is a number of from about 2 to about 10; z is the number 3, 4 or 5; n is a weight fraction number with k, l and o are weight fraction numbers with k being from about 0.35 to 0.95, l being from 0.1 to about 1.2, and o is from about
Abstract: A branched polysiloxane styrene butadiene polymer of the following formula ##STR1## wherein m is a number of from about 2 to about 10; z is the number 3,4 or 5; n is a number of from about 10 to about 1,000; k, l and o are weight fraction numbers with k being from about 0.35 to about 0.95, l being from 0.1 to about 0.2, and o is from about 0.05 to about 0.5; R is an aromatic substituent, alkyl-CR"C(O)O, and alkylene-CR"C(O)O, wherein R" is hydrogen or an alkyl substituent, and R' is an alkyl substituent or a trialkylsilylether substituent.

19 citations



Journal Article
TL;DR: On etudie par absorption UV la quantite de latex styrene-butadiene a la surface de papiers couches avec du SBR et de l'amidon comme liants, en vue de determiner la migration du liant as discussed by the authors.
Abstract: On etudie par absorption UV la quantite de latex styrene-butadiene a la surface de papiers couches avec du SBR et de l'amidon comme liants, en vue de determiner la migration du liant

14 citations


Book ChapterDOI
01 Jan 1987
TL;DR: More than half of the world's synthetic rubber is styrene-butadiene rubber (SBR) as mentioned in this paper, which is the most commonly used synthetic rubber for tire manufacturing.
Abstract: More than half of the world’s synthetic rubber is styrene-butadiene rubber (SBR). World usage of SBR is about the same as that of natural rubber: between eight and nine billion pounds of each (see Fig. 7.1 and Tables 7.1 and 7.2). The factors accounting for this dominance are economic and technological: (1) the availability of styrene and butadiene precursorsin, fossil hydrocarbons makes these two monomers preeminent among the possible source of synthetic rubber, and (2) they can be combined in rubber compounds that can be processed conveniently in tire molds, where thermal treatment converts them into tires. Much of the modern world’s transportation relies on these durable, tough elastic composites. In fact, the tire industry has come to depend on SBR more than on natural rubber, partly because the latter has at times been harder to get, and partly because SBR often is better for the purpose required. Similarly, other synthetic rubbers have competed on the basis of both availability and technological utility; in some cases, they have even found niches, but lesser ones. It is instructive to examine history, searching for the reasons SBR has won its dominance, especially at a time when its share of the market is declining.

11 citations


Patent
28 Mar 1987
TL;DR: The compsn. as discussed by the authors comprises 50-90% bitumen emulsion with a clay emulsifier, contg. 50-350 mVal Zn ions per 100 g clay, at pH 9-13; 0.1-1.5 pts.
Abstract: The compsn. (I) comprises (a) 50-90 pts.wt. 45-60% bitumen emulsion with a clay emulsifier, contg. 50-350 mVal Zn ions per 100 g clay, at pH 9-13; (b) 0.1-1.5 pts.wt. mixt. of a cold- and a hot-vulcanisation accelerator in ratio 3:1 to 1:3; (c) 0.1-1.5 pts.wt. ground or colloidal sulphur; (d) 10-40 pts.wt. 35-55% styrene-butadiene latex of styrene content 20-35 wt.% and anionic emulsifier based on fatty acids and alkyl arylsulphonates; (e) as stabilisr, 0.01-5 pts.wt. alkoxylated alkylphenol, alcohol or amine, with alkoxylation no. 3-10, and (f) 0.5-15 pts.wt. ground or fibrous filler. Seamless, monolithic sealing layers formed from (I), with or without an adhesive intermediate layer, on a substrate, are also claimed. (I) pref. also contains 0.05-1.5 pts.wt. aq. dispersion of polyacrylate which thickens in alkaline medium, or dispersion of a butadiene-styrene-methacrylic acid copolymer. Cold-vulcanising accelerator is a Na dithiocarbonate and hot-vulcanising accelerator is a Zn dithiocarbonate and/or a thiuram disulphide. Stabiliser is alkoxylated 7-12 C-alkyl-phenol and/or alkoxylated linear alcohol or alkoxylated 10-20 C linear monoamine; alkoxy gps. are ethoxy. Filler is kaolin or rockflour and/or asbestos powder or asbestos fibres or organic fibres, partic. textile waste or animal hair. 0.05-2.0 wt.% of 10-50% soln. of a Mg salt is added to (I) and thickening is stopped after reaction for 10-120 minutes. (I) has on upper surface protective layer of a heavy mineral. USE/ADVANTAGE - Covering roofs on new and reconstructed buildings, sealing in road construction, structural, civil, and hydraulic engineering. (I) is cold-processable, can be prepd. with viscosity varying over a range, sets quickly even in thick layers, and gives seal with good extension even at low temp. and good resistance to ageing, root growth, and water.

10 citations


Journal ArticleDOI
TL;DR: In this article, the dynamic viscoelastic properties of 30 wt% solutions of styrene (S)butadiene (B) radial (star) block copolymers were measured to investigate the effect of deformation history.
Abstract: The dynamic viscoelastic properties of 30 wt% solutions of styrene (S)‐butadiene (B) radial (star) block copolymers were measured to investigate the effect of deformation history. The block structure for SBH1 examined was (S‐B‐)m and that for BSH1 (B‐S‐)n, where m and n are about 5. The solvents used were chlorinated diphenyl (KC4) and dibutylphthalate (DBP); the former is a good solvent for both polystyrene (PS) block and polybutadiene (PB) block, and the latter is a good solvent for PS block and a poor solvent for PB block. Both storage modulus G′ and loss modulus G″ vary little with maximum strain amplitude (γ0) for the solutions in KC4, or for those in DBP at 80°C. On the other hand, G′, and G″ depend significantly on γ0 for solutions in DBP at temperatures lower than 60°C, implying that the former systems are homogeneous solutions and the latter contain microdomain structure. G′ and G″ of DBP solutions of SBH1 are independent of γ0 for γ0⩽0.03,G′ decreases and G″ increases in the range 0.04<γ0<0.1, a...

10 citations


Journal ArticleDOI
TL;DR: In this paper, natural rubber, styrene-butadiene rubber, and polybutadienes rubber were used to replace part of the butadiene-acrylonitrile rubber in a 70/30 butadiENE-ACryloniticle rubber/poly(vinyl chloride) blend.
Abstract: Natural rubber, styrene-butadiene rubber, and polybutadiene rubber were used to replace part of the butadiene-acrylonitrile rubber in a 70/30 butadiene-acrylonitrile rubber/poly(vinyl chloride) blend. Such replacement up to 15% of the total weight of the blend improved the mechanical properties, while decreasing the cost of the blend. Styrenebutadiene rubber could replace butadiene-acrylonitrile rubber up to 30% of the total weight of the blend without deterioration in the mechanical properties.

10 citations


Journal ArticleDOI
TL;DR: In this paper, a carbon black filled 50/50 natural rubber (NR)/styrene-butadiene rubber (SBR) blend is vulcanized using several conventional curing systems designed by varying the amounts of sulphur and accelerator.
Abstract: A carbon black filled 50/50 natural rubber (NR)/styrene-butadiene rubber (SBR) blend is vulcanized using several conventional curing systems designed by varying the amounts of sulphur and accelerator. The cure characteristics and the properties of the vulcanizates are compared. The quantity and quality of crosslinks in each case are evaluated by chemical probes to correlate them with the vulcanizate properties. Ein mit Rus gefulltes 50/50 NR/SBR-Blend (Naturkautschuk/Styrol-Butadien-Copolymer) wurde unter Verwendung verschiedener konventioneller Vernetzungssysteme, die durch unterschiedliche Schwefel- und Beschleunigeranteile gekennzeichnet sind, vulkanisiert. Die Vulkanisationscharakteristiken und die Eigenschaften der Vulkanisate wurden verglichen. Das Ausmas und die Qualitat der Vernetzungsstellen wurden fur jeden Fall durch chemische Testmethoden ermittelt, um sie mit den Vulkanisateigenschaften zu vergleichen.

6 citations


Book ChapterDOI
G. Weymans1, U. Eisele1
TL;DR: In this article, the ultimate mechanical properties of four series of filled SBR samples are analyzed and discussed in detail, and it is argued that two parameters (activity and concentration of filler particles) have a decisive influence on the homogeneity of the final network structure.
Abstract: The ultimate mechanical properties of four series of filled SBR samples are analysed and discussed in detail. It is argued that two parameters (activity and concentration of filler particles) have a decisive influence on the homogeneity of the final network structure.

Journal ArticleDOI
TL;DR: In this article, two types of cord, namely Nylon and Rayon, with variation in the number of twists per inch in a natural rubber (NR) compound with and without a dry-bonding system are considered.

Patent
07 Nov 1987
TL;DR: In this article, a shoe heel is covered with color stripes made of wood root and rubber-plastic materials, belonging to the improvement of the leather shoe heel material, thus the decorative effect is strong and the cow leather is saved.
Abstract: The utility model discloses a shoe heel covered with color stripes made of wood-root and rubber-plastic materials, belonging to the improvement of the leather shoe heel material. The covering material of the wood shoe heel made of the combined material is scarf-jointed with thick-thin spaced color stripes matched harmoniously with the colors of the various leather shoe surfacing materials, thus the decorative effect is strong and the cow leather is saved. The covering material of the shoe heel is composed of No. 1-5 natural rubber, cis-butadiene rubber, styrene butadiene rubber and high polystyrene resin (the content of the polystyrene is more than 60%). Therefore, the utility model is provided with the characteristics of no water-fear, wear resistance and impact resistance.

Journal ArticleDOI
TL;DR: In this paper, the dynamic viscosity of a styrene butadiene-styrene triblock copolymer melt in the cylindrical phase was measured in the frequency range from 10−3 to 103 rad s−1 for various temperatures between 130°C and 190°C.
Abstract: The dynamic viscosity of a styrene—butadiene—styrene triblock copolymer melt in the cylindrical phase was measured in the frequency range from 10−3 to 103 rad s−1 for various temperatures between 130°C and 190°C. The Argand plots (η″(ω) versus η′(ω)) show two domains of the Cole—Cole type, and we developed a method of decomposition of these plots into elementary Cole—Cole domains by the minimization technique of Davidon—Fletcher—Powell. The faster relaxation mechanism is attributed to the relaxation of the entangled polybutadiene chains in their primitive tubes, but modified by the terminal polystyrene blocks. The longer relaxation time is attributed to constraint release at the polybutadiene chains due to the diffusion of the polystyrene blocks along the cylindrical domains.

Patent
25 Feb 1987
TL;DR: In this paper, a random styrene-butadiene copolymer composition, consisting of a straight-chain component modified with a specific amide compound and a branched component modified by a specific polyfunctional coupling agent and having a specific styrene chain distribution, is presented.
Abstract: PURPOSE:A random styrene-butadiene copolymer composition, consisting of a straight-chain component modified with a specific amide compound and a branched component modified with a specific polyfunctional coupling agent and having a specific styrene chain distribution. CONSTITUTION:A composition, consisting of (A) 20-80wt% straight-chain component obtained by reacting a lithium-terminated copolymer prepared by copolymerizing styrene with butadiene in the presence of an organolithium compound as a polymerization initiator in a hydrocarbon solvent with an amide compound expressed by the formula (R1 is 1-6C alkyl, cycloalkyl or alkoxyalkyl; Y is oxygen or sulfur; n is an integer 3 or 4) (the polymethylene chain may be substituted by 1-6C alkyl group) and (B) 8-20wt% branched component obtained by reacting the lithium-terminated polymer (A) with a coupling agent having >=3 reactive sites and having 5-45wt% combined styrene and >=40wt% thereof being styrene chain, containing =8 styrene units and having 30-150 Mooney viscosity.


Journal ArticleDOI
TL;DR: The configurational sequence of styrene units and the arrangement of 1,2-butadiene units in styrene butadiene copolymers were characterized by 1H- and 13C-NMR analysis of the ozonolysis products which were separated by a combination of GPC and HPLC as mentioned in this paper.
Abstract: The configurational sequence of styrene units and the arrangement of styrene and 1,2-butadiene units in styrene-butadiene copolymers were characterized by 1H- and 13C-NMR analysis of the ozonolysis products which were separated by a combination of GPC and HPLC. The ozonolysis products from diad and triad styrene sequences flanked by 1,4-butadiene units showed two and three peaks in HPLC, respectively, reflecting the diad and triad tacticity. The probability of racemic addition was found to be 0.56 and 0.58 for radical and anionic SBR, respectively. The ozonolysis products from styrene-1,2 sequences were separated into three fractions by HPLC. The first and second fractions were assigned to a 1,4-1,2 styrene-1,4 (VS) structure differed only in cotacticity. The third fraction was considered to be a mixture of the meso and racemic forms of the l,4-styrene-l,2-l,4 (SV) sequence. The GPC fraction corresponding to a sequence consisting of two styrenes and one 1,2 units was separated into four peaks by ...

Patent
23 Dec 1987
TL;DR: In this article, a tapered styrene butadiene copolymer rubber was proposed to obtain the title composition having excellent low-temperature characteristics, by blending a tapeed styrene-butadiene Copolymer having specific combined styrene amount with a blend rubber at a specific ratio.
Abstract: PURPOSE: To obtain the title composition having excellent low-temperature characteristics, by blending a tapered styrene-butadiene copolymer having specific combined styrene amount with a blend rubber at a specific ratio. CONSTITUTION: The aimed composition containing a blend rubber consisting of (A) 10W90 pts.wt. tapered styrene butadiene copolymer rubber being a styrene-butadiene copolymer containing 10W40wt.% average combined styrene amount and ≥50wt.% 1,2-bond content of butadiene part and increasing or decreasing the combined styrene amount in the one direction along the above- mentioned copolymer molecular chain and (B) 90W10 pts.wt. natural rubber and/or synthetic polyisoprene as a main rubber component. Furthermore, the component A is preferably reaction product of living tapered styrene.high-vinyl butadiene copolymer with a compound such as an organic compound having the formula (X is O or S) in a molecular chain. COPYRIGHT: (C)1989,JPO&Japio


Patent
14 Jan 1987
TL;DR: In this paper, a block copolymer containing a specific polymer block in an aqueous medium, polymerizing a styrenic monomer and adding an organic blowing agent to the polymer was used to obtain the titled particles useful as a cushioning material, etc.
Abstract: PURPOSE: To obtain the titled particles useful as a cushioning material, etc., having high stability of cell size controlling effects, by suspending a block copolymer containing a specific polymer block in an aqueous medium, polymerizing a styrenic monomer and adding an organic blowing agent to the polymer. CONSTITUTION: 0.001W1wt.% block copolymer containing (A) a polymer block of monovinyl-substituted aromatic hydrocarbon at both ends and (B) an elastomeric polymer block of saturated or unsaturated conjugated diene at the inner chain is dissolved in (C) a styrenic monomer and the solution is suspended in an aqueous medium. Then the component C is polymerized in suspension and (D) an organic blowing agent is added to the polymer or the polymer particles are impregnated with the component D after polymerization process to give the aimed particles. The component B is preferably styrene butadiene styrene block copolymer, etc. COPYRIGHT: (C)1988,JPO&Japio

Patent
22 Jun 1987
TL;DR: In this article, a mixture of synthetic butadiene copolymer rubber latex with rubber asphalt and water dispersion of specific silicon oxide is used to obtain latex providing a film of coating, drying rapidly, showing improved adhesiveness in water freezing or at high temperature.
Abstract: PURPOSE:To obtain latex providing a film of coating, drying rapidly, showing improved adhesiveness in water freezing or at high temperature, having easy laying operation, by blending cationic rubber latex with rubber asphalt and water dispersion of specific silicon oxide. CONSTITUTION:Styrene butadiene copolymer rubber latex having 100-160 Mooney viscosity, natural rubber latex or its mixture which is made cationic with an alkylamine ethylene oxide or its analog is blended with a petroleum viscous resin having <=10,000 molecular weight, such as straight asphalt, polybutene, etc., having <=80 deg.C flow temperature, water dispersion of ultrafine particles of silicon oxide having 5-100 milimicron particle diameters, having a silanol group and, if necessary, various fillers. USE:A waterproofing material, soil reinforcing material, sealing material, coating material, adhesive, group material or paving material.

Journal ArticleDOI
TL;DR: In this article, the properties of cement composites made from alkali-resistant Cem-FIL glass fibres and Portland cement modified by styrene-butadiene rubber (SBR) latex and kept in three different environments for up to 15 years are described.

Patent
19 Jun 1987
TL;DR: In this article, a highly shrinkable, preferably transversely shrinkable film is described which is formed essentially from styrene-butadiene block copolymers as the principal component and a natural or synthetic resin having a softening point of from 60 to 150 DEG C as the second component.
Abstract: A highly shrinkable, preferably transversely shrinkable film is described which is formed essentially from styrene-butadiene block copolymers as the principal component and a natural or synthetic resin having a softening point of from 60 to 150 DEG C as the second component. The film preferably also contains polystyrene as a further component. It is generally prepared by extruding or calendering a mixture of the film components. It is possible to achieve particularly high shrinkage values in the novel film by stretching. The film is furthermore distinguished by high light transparency, even after the shrinking operation. It is also possible to stretch the film at a relatively low temperature and to vary the stretching temperature within a relatively broad range. Novel films also exhibit no significant blocking.



Patent
22 Oct 1987
TL;DR: In this paper, a slip-preventing tool was used to improve the durability and abrasion resistance by using the rubber in a specific compounding ratio of natural rubber and diene group synthetic rubber such as styrene butadiene rubber.
Abstract: PURPOSE:To improve durability and abrasion resistance by using the rubber in a specific compounding ratio of natural rubber and the diene group synthetic rubber such as styrene butadiene rubber and obtaining the rubber harness adjusted to a specific value, in a slip preventing tool which has a net form and is made of rubber CONSTITUTION:A tire slip preventing tool 2 which has a net form and made substantially of rubber and is used for the winding on a tire 1 is made of the rubber in the compounding ratio of 40-80pts of natural rubber and 60-20pts of the butadiene group synthetic rubber such as styrene butadiene rubber and butadiene rubber The hardness is adjusted in the range of 55-75 deg Therefore, the durability and abrasion resistance of the slip preventing tool can be improved, and the faculty on the ice snow can be improved

Patent
09 Nov 1987
TL;DR: In this paper, the authors present a 3% by wt. C of one or more aromatic phosphorous compounds having a viscosity at 40 deg and at least 4 cSt.
Abstract: There is at least 3% by wt. of one or more aromatic phosphorous compounds having a viscosity at 40 deg. C of 200-300 cSt (esp. 400-700 cSt). Optionally there is a mineral oil extract having a viscosity at 135 deg. C of at least 4 cSt. The composition has a viscosity at 135 deg. C of at least 80 cSt esp. at least 140 cSt.

Journal ArticleDOI
TL;DR: In this article, the double exponential and Weibull distributions of the fatigue life of styrene-butadiene rubber (SBR)-mica composites have been compared to that of the conventional Japanese industrial standards method.