Carboxylated butadiene-styrene rubber

Polymers can be modified by the introduction of ionic groups [I]. The ionic polymers, also called ionomers, offer great potential in a variety of applications. Ionic rubbers are mostly prepared by metal ion neutralization of acid functionalized rubbers, such as carboxylated styrene-butadiene rubber, carboxylated polybutadiene rubber, and carboxylated nitrile rubber 12-5]. Ionic rubbers under ambient conditions show moderate to high tensile and tear strength and high elongation. The ionic crosslinks are thermolabile and, thus, the materials can be processed just as thermoplastics are processed [6]. 

HSBR HTNR HXSBR ICTA Hydrogenated styrene butadiene rubber Hydroxyterminated liquid NR Hydrogenated carboxylated styrene butadiene rubber International Confederation for Thermal Analysis... 

Low absorptive capacity primary foam dressings have been produced from a carboxylated styrene butadiene rubber latex foam. The foam is bonded to a non-woven fabric coated with a polyethylene film which has been vacuum ruptured. The basic foam is naturally... 

This chapter concludes with brief reference to carboxylated rubber latexes. Further information, with references, is available in a review by Blackley [27]. Carboxylated rubber latexes contain rubbery polymers which have been modified by inclusion of a small amount of a copolymerisable carboxylic-acid monomer in the emulsion polymerization system by which they were prepared. Typical carboxylic-acid monomers are acrylic acid (XI), methacrylic acid (XII) and itaconic acid (XIII). The most industrially-important rubber latexes of this type are the carboxylated styrene-butadiene rubber latexes. Also of considerable... 

Stephen, R., Ranganathaiah, C., Varghese, S., Joseph, K., and Thomas, S., Gas transport through nano and micro composites of natural rubber (NR) and their blends with carboxylated styrene butadiene rubber (XSBR) latex membranes. Polymer, XI, 858-870 (2006). 

Carboxylated styrene-butadiene rubber Polyester Stainless steel 0.4 (0.24) [42] 60 [42] 248 [42] ... 

Another example given by Stephen et al. [66] evaluated the transport properties of solvents in membranes fabricated using ZnO-filled NR, carboxylated styrene-butadiene rubber (SBR), and a 70/30 blend using the two polymers. In the unblended samples containing filler, the diffusion coefficient was dramatically decreased with the increase of filler content. However, the blends exhibited high diffusion coefficients for high filler concentrations. 

R. Stephen, K. Joseph, Z. Oommen, S. Thomas, Molecular transport of aromatic solvents through microcomposites of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) and their blends. Composites Science and Technology, ISSN 0266-3538 67 (6) (May 2007) 1187-1194. http //dx.doi.Org/10.1016/j.compscitech.2006.05.009. 

INVESTIGATION ON PRODUCTION OF CARBOXYLATED STYRENE-BUTADIENE RUBBER LATEX IN DIFFERENT POLYMERISATION REACTORS... 

The natural rubber does not generally exhibit all the desired properties for use in the rubber industry. Thus, it is possible to obtain better mechanical and physical properties at a lower cost by blending natural rubber with synthetic rubbers. Normally, natural rubber is deteriorated by ozone and thermal attacks due to its highly unsaturated backbone, and it also shows low oil and chemical resistances due to its non-polarity. However, these properties can be achieved by blending it with low unsaturated ethylene propylene diene monomer rubber, styrene butadiene rubber, carboxylate styrene butadiene rubber, nitrile butadiene rubber, chloroprene rubber, chlorosulfonated polyethylene rubber, and acrylonitrile butadiene rubber. 

The diffusion of some aromatic solvents (benzene, toluene, and p-xylene) through microcomposites of NR/carboxylated styrene-butadiene rubber (XSBR) latex blend membranes (70/30) was investigated by Stephen et al. Results indicated that the blend membrane exhibited unexpected diffusion behaviour, and this was attributed to the immiscibility of the two blend... 

The thermal stability of NR and carboxylated styrene butadiene rubber (XSBR) lattices and their blends were studied by thermogravimetric methods by Stephen et The thermal degradation and ageing properties of these individual lattices and their blends were investigated with special reference to blend ratio and vulcanization techniques. As already described, as the XSBR content in the blends increased, their thermal stability was also found to increase. Among sulphur and radiation-vulcanized samples, radiation cured possessed higher thermal stability due to the higher thermal stability of carbon carbon crosslinks. 

R. Stephen et al. also studied the effect of microfillers on the thermal stability of NR, carboxylated styrene-butadiene rubber (XSBR) lattices and their 70/30 NR/XSBR blend. Microcomposites of XSBR and their blend were found to be thermally more stable than unfilled samples. ... 

Boonmahitthisud et al., prepared natural rubber/carboxylated styrene butadiene rubber (NR/XSBR) (80/20) nanocomposites containing different loadings of carbon nanotube (CNT) (0.1-0.4 phr) by a latex stage compounding method. The dynamic mechanical properties, in terms of tan 8 and E, of the neat 80/20 NR/XSBR blend and its nanocomposites were evaluated from —80 to 100 °C. Figure 21 shows the influence CNT loadings, on the tan 8 and E as a function of temperature for the nanocomposites [100]. 

In the past, considerable industrial interest has been shown in solid carboxylated polymers such as carboxylated styrene-butadiene rubbers (l-9) However industrial interest is now almost exclusively with carboxylated polymers in latex form Furthermore, interest is principally in the latices of carboxylated rubber latices, and of these the carboxylated styrene-butadiene rubber latices are pre-eminent. Statistics recently published for the consumption of synthetic latices of all types in Western Europe over the period 1979-QO indicate that, on a basis of dry polymer, carboxylated styrene-butadiene types make up some QP/o of the total (10). 

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