Solution styrene-butadiene rubber

JSR Corp. Styrene-butadiene rubber, solution Styrene and butadiene Efficient and advanced technology yields S-SBR with excellent properties 1 1991... 

Kerns, M.L. Henning, S.K. Synthesis and rheological characterization of branched versus linear solution styrene-butadiene rubber. Rubber Chem. Technol. 2002, 75, 299-308. http //www.dow.com/. 

A process has been developed for electroplating a PPA resin, modified with ethylene propylene diene monomer rubber, ethylene-propylene rubber, and styrene-butadiene rubber. As etching solution, chromic acid is used. However, it has been found that the concentration of Cr + is crucial for the success of the method. The concentration of Cr + is in the range of 50-55 gU Low levels of Cr + result in poor adhesion of the final metal plating, while high levels of Cr + can cause the formation of small blisters in the metal plating. The influence of the process parameters on the peel strength is shown in Table 12.9. 

A typical example of preparation of such rubber adhesive solutions is natural rubber, polychloroprene, styrene-butadiene rubbers, nitrile rubber or others, mixed and compounded in the conventional manner using internal (Banbury) mixers or mills. The unvulcanized rubber mix is then made into a solution (or cement). Dry aromatic solvents such as xylene, toluene or chlorobenzene (900 parts of solvent per hundred of rubber mix) are added and agitated to dissolve the elastomer. Forty parts of MDI are added to the elastomer solution with agitation. The cements are stored at room temperature the NR cement is stable for 7 days, the SBR keeps for 3-4 days and the polychloroprene cement is stable for 3 days. 

Das et al. incorporated MWNTs into solution-styrene-butadiene rubber (S-SBR) /butadiene rubber (BR) a 50 50 blend, using a roll milling technique [64]. In the process, MWNTs were first dispersed in ethanol, and the nanotube-alcohol suspension was then mixed with the rubber blend in a roll mill at high temperatures, denoting as the wet-mixed composites. For comparison, MWNTs were also mixed directly into the rubber compound, forming the so-called dry-mixed composites. Figure 6.25 shows the variation in DC conductivity with carbon nanotube content for MWNT/S-SBR-BR nanocomposites prepared by wet-... 

Das A, Stockelhuber K W, Jurk R, Saphiannikova M, Fritzsche J and Lorenz H (2008) Modified and unmodified multiwalled carbon nanotubes in high performance solution-styrene-butadiene and butadiene rubber blends. Polymer 49 5276-5283. 

Solution styrene butadiene rubber (S-SBR) (Sprintan SLR-4601, Styron Deutschland GmbH) and acrylonitrile butadiene rubber (NBR) (Perbunan 3445F, Lanxess GmbH) with a nitrile content of 34% as well as NR (SMR 10, Standard Malaysian Rubber) were used as rubbers. The silica used was Ultrasil 7000 GR (Evonik Industries) with a specific surface area CTAB of 160 m /g and BET of 170 m /g. Stearic acid, zinc oxide (ZnO), N-cyclohexyl-benzothiazole-2-sulfenamide (CBS) and sulfur were used as processing and curing additives, respectively. The experimentally determined values of surface tension and Mooney viscosity of the materials used are given in Table 6.1. 

The family consists of, in order of market volume, polybutadiene (or butadiene rubber, BR), solution styrene butadiene rubber (SSBR) and styrenic block copolymers (SBC). A further subdivision may be made into those polymers that require vulcanisation (BR, SSBR) and those that do not (SBC). The latter are also known as thermoplastic rubbers as they have rubbery properties below a certain temperature when they soften and may be processed like thermoplastics. 

Some styrene-butadiene rubber is manufactured by solution processes using alkyllithium catalysts. Production techniques resemble those used for the polymerization of isoprene (Section 18.3.3) and butadiene (Section 18.4.3). Solution styrene-butadiene rubbers have microstructures similar to those of the emulsion copolymers but show narrower molecular weight distribution, less long chain branching and lower non-rubber content. The two types of materials have very similar bulk properties. 

STRUCTURAL CONTROL IN SOLUTION STYRENE-BUTADIENE RUBBERS USING ANIONIC CATALYST SYSTEMS... 

APPROACHES FOR PREPARATION OF RANDOM SOLUTION STYRENE-BUTADIENE RUBBERS... 

Characterization of Styrene Sequence Distribution in Solution Styrene-Butadiene Rubbers by Anionic Polymerization... 

Standard contact adhesives and pressure-sensitive adhesives are made from SBR in solution. Styrene-butadiene rubber latices, in some cases containing carboxyl groups, are used for special emulsion-based adhesives. Thermoplastic elastomeric block copolymers of styrene with butadiene or isoprene are of increasing significance in contact adhesives and hot-melt adhesives. 

Contact Adhesives. Nowadays, rubber solutions based on natural rubber or styrene-butadiene rubber, optionally in conjunction with regenerate and depolymerized rubber, are used for large-area bonding where adhesion does not have to meet stringent requirements, as is the case, for example, with the lining of vessels, containers, etc. with rubber. 

Miller et al used transmission spectroscopy in the near infrared region (1100 -2500 nm) to determine cis-1,4 butadiene, trans-1.4 butadiene and 1.2 butadiene units in butadiene rubber and styrene-butadiene rubber in bulk and in carbon tetrachloride solution. 

After the war when natural rubber became available again the consumption of styrene-butadiene rubber began to fall however, the trend was reversed in 1949 with the advent of a copolymer made at low temperature. This product gives a passenger-tyre rubber superior to natural rubber and styrene-butadiene rubbers have remained the most important of the large-tonnage rubbers (Table 20.2). In the early 1960s, solution polymerized styrene-butadiene rubbers became available. These rubbers show further improvements in tyre performance. In 1965, styrene-butadiene thermoplastic elastomers were introduced. 

Styrene/butadiene rubber (emulsion plus solution) Styrene / butadiene emulsion rubber-latex Butadiene rubber Isoprene rubber Chloroprene (or neoprene) rubber... 

Butadiene copolymers are mainly prepared to yield mbbers (see Styrene-butadiene rubber). Many commercially significant latex paints are based on styrene—butadiene copolymers (see Coatings Paint). In latex paint the weight ratio S B is usually 60 40 with high conversion. Most of the block copolymers prepared by anionic catalysts, eg, butyUithium, are also elastomers. However, some of these block copolymers are thermoplastic mbbers, which behave like cross-linked mbbers at room temperature but show regular thermoplastic flow at elevated temperatures (45,46). Diblock (styrene—butadiene (SB)) and triblock (styrene—butadiene—styrene (SBS)) copolymers are commercially available. Typically, they are blended with PS to achieve a desirable property, eg, improved clarity/flexibiHty (see Polymerblends) (46). These block copolymers represent a class of new and interesting polymeric materials (47,48). Of particular interest are their morphologies (49—52), solution properties (53,54), and mechanical behavior (55,56). 

Styrene—Butadiene Rubber (SBR). This is the most important synthetic mbber and represents more than half of all synthetic mbber production (Table 3) (see Styrene-butadiene rubber). It is a copolymer of 1,3-butadiene, CH2=CH—CH=CH2, and styrene, CgH5CH=CH2, and is a descendant of the original Buna S first produced in Germany during the 1930s. The polymerization is carried out in an emulsion system where a mixture of the two monomers is mixed with a soap solution containing the necessary catalysts (initiators). The final product is an emulsion of the copolymer, ie, a fluid latex (see Latex technology). 

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