Styrene-polybutadiene-polystyrene

Figure 8.3 Ternary phase diagram for mixtures of styrene-polybutadiene-polystyrene.

S-(a-MeS)B 4 Polystyrene poly(a-methylstyrene) High 1,4-polybutadiene 1,2-polybutadiene Polystyrene (poly-(a-methylpoly-styrene) Polyethylene ... 

E4 polystyrene-Z)/ocA -[l,4-polybutadiene-grq/Z -poly(styrene-co-acrylonitrile)] (copolymer from styrene and acrylonitrile grafted to a 1,4-polybutadiene-polystyrene two-block copolymer at unspecified sites of some of the but-2-ene-... 

Acrylonitrile, butadiene and styrene can be polymerised individually. Acrylonitrile yields polyacrylonitrile which makes soft fibres for clothing (sold as Orion and Courtelle), while butadiene forms polybutadiene or synthetic rubber, and styrene as polystyrene is known for its excellent insulation properties. 

Block copolymers of butadiene and vinyl-2-naphtalene (BVN) have been synthetized and studied by the same techniques as polybutadiene-poly(a-methyl styrene) and polystyrene-polybutadiene block copolymers86,87. They exhibit the same structures, namely lamellar and cylindrical as SB and BMS block copolymers86,87. ... 

A preliminary screening indicated that excellent impact could be obtained using 15-20 wt % butadiene based on the total polymer blend. At 20 wt % butadiene, several block polymers were screened for optimum impact and overall balance of properties. Two-component systems (block polymer-polystyrene) and three-component systems (block poly-mer-polybutadiene-polystyrene) were tried. The impact varied with the styrene content of the block polymer in both two- and three-component systems as shown in Figure 1. Subsequent work showed that the best overall balance of impact, flexural modulus, and heat distortion was obtained at 15% butadiene. 

Equilibritun concentrations of polymers in POO-emul-sions polybutadiene-polystyrene-styrene. 

Polystyiene-polybutadiene Polybutadiene-poly(a-methyl styrene) Polybutadiene-poly(vinyl naphthalene) Polystyrene-polybutadlene-polystyrene Polybutadiene-polystyrene-polybutadiene Polystyrene-polyisoprene Pblystyrene-polyisoprene-polystyrene Polyia>prene-poly(vinyl-2-p dine) PofyiK>prene-poly(vinyl-4-pyridine) Polyisoprene-poly(methyl methacrylate) Polystyrene-poly(butadiene or ia>prene)-polystyrene Star polystyrene-polybutadiene with 4 branches Star polybutadiene-polystyrene with n branches Star polystyrene-polybutadiene with n branches Star polystyrene-polyisoprene with n brandies Polystyrene-polyisoprene-poly(vinyl-2-pyridine) Polystyrene-poly vinyl-2-pyridine) Polystyrene-poly(vinyl-4-pyridine) Poly(vinyl-2-pyridine)-poly(vinyl-4-pyridine)... 

Graft copolymers of A and B monomers are named poly(A-g-B) or poly -graft-po y B with the backbone polymer -(-A-) - mentioned before the branch polymer. Some examples are poly(ethylene-g-styrene) or polyethylene-gra/it-polystyrene and starch-gra/ir-polystyrene. In the nomenclature of block copolymers, b or block is used in place of g or graft, e.g. poly(A-b-B) or poly A-block-poly B, poly(A-6-B-6-A) or poly A-6/ocik-poly B-blocic-po y A, poly(A-b-B-6-C) or poly A-6/ock-poly B-block-po y C), and so on. Thus the triblock polymer (XXIV) is called poly(styrene-6-butadiene-b-styrene) or polystyrene-6/ocA -polybutadiene-6/ock -polystyrene. When such polymers are articles of commerce they are usually designated by the monomer initials thus, structure (XXIV) would be named SBS block copolymer. 

The polystyrene/styrene/polybutadiene (PS/S/PBD) system occurs in the production of high impact polystyrene. The process for making toughened polystyrene as described by Moulau and Keskkula (1) starts with a rubber in styrene solution. As S is polymerized to PS, phase separation results in immediate formation of droplets of a PS phase. With further polymerization, the PS phase increases in volume until phase volumes are equal. At this point, phase inversion occurs—the dispersed PS phase becomes the continuous phase and the PBD phase becomes the disperse droplets. Complete conversion of S to PS yields the commercially important high impact polystyrene. 

Styrene - Crystalline Polystyrene 85% Styrene - Styrene Butadiene Copolymer 45% Styrene Styrene Butadiene Copolymer 30% Styrene Styrene Butadiene Copolymer 23% Styrene - Styrene Butadiene Copolymer 5% Styrene - Styrene Butadiene Copolymer Cis Polybutadiene Cis-Trans Polybutadiene... 

Polybutadiene/polystyrene copolymer. See Styrene/butadiene polymer Polybutadiene resin Polybutadiene rubber. See Polybutadiene... 

Butadiene/styrene polymer 1,3-Butadiene/styrene polymer Butadiene/styrene resin 1,3-Butadiene/styrene resin Butadiene/styrene rubber Ethenylbenzene polymer with 1,3-butadiene Polybutadiene/polystyrene copolymer Poly (styrene-co-butadiene) S/B SBR Styrene/butadiene... 

In 1965 Shell Oil Co. introduced styrenic TPEs, under the trade name Kraton, which are polystyrene-b-polyisoprene(or polybutadiene)- -polystyrene (PS-b-PI(or PBd)- -PS linear triblock copolymers, made by anionic polymerization. Later, BASF introduced styrenic PTEs having tapered blocks (i.e., Styroflex). The typical styrene content of TPEs is between 25 and 40wt.%. When more stable TPEs, toward oxygen. 

Although the unmodified styrenics, viz., polystyrene, SAN, SMA, SMMA copolymers, exhibit good clarity, strength, and rigidity, they are invariably brittle for many applications. Hence, the rubber-modified styrenics such as HIPS and ABS, which combine a good level of impact strength with moderate heat resistance, have become more widely accepted in many molding and extrusion applications. Structurally, HIPS and ABS may themselves be considered as blends, since they contain >5 % polybutadiene rubber as a discrete phase, dispersed as 0.1-5 pm-size... 

Unlike PAN, this polymer remains unchanged for thermal treatments below 420°C. The use of two types of polymeric matrices permits the study of the influence of the polymer nature on metal particle formation. Co octacarbonyl was chosen for incorporation into polymeric matrices because it can give ferromagnetic cobalt particles in mild thermal conditions however, previously we have found that Co2(CO)g is not compatible with polybutadiene, polystyrene and a pdly(styrene-butadiene) block copolymer. 

In the most common production method rubbery polybutadiene (PBD) is precipitated from a styrene-polybutadiene solution in styrene during the polymerization of styrene. The precipitated phase itself typically contains 2-10-/xm particles consisting of a rubbery sphere containing spheroidal polystyrene inclusions that are separated hy thin membranes of PBD rubber (see Fig. 19). It is believed that this type of composite particle has an advantage over solid rubber spheres because for a given weight fraction, it maximizes the effective volume fraction of... 

Figure 9.17 Plot of log [i ]M versus retention volume for various polymers, showing how different systems are represented by a single calibration curve when data are represented in this manner. The polymers used include linear and branched polystyrene, poly(methyl methacrylate), poly(vinyl chloride), poly(phenyl siloxane), polybutadiene, and branched, block, and graft copolymers of styrene and methyl methacrylate. [From Z. Grubisec, P. Rempp, and H. Benoit, Polym. Lett. 5 753 (1967), used with permission of Wiley.]...

Fig. 15. Oxygen permeability versus 1/specific free volume at 25 °C (30). 1. Polybutadiene 2. polyethylene (density 0.922) 3. polycarbonate 4. polystyrene 5. styrene-acrylonitrile 6. poly(ethylene terephthalate) 7. acrylonitrile barrier polymer 8. poly(methyl methacrylate) 9. poly(vinyl chloride) 10. acrylonitrile barrier polymer 11. vinyUdene chloride copolymer 12. polymethacrylonitrile and 13. polyacrylonitrile. See Table 1 for unit conversions.

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