Polystyrene-butadiene

Many of the most floppy polymers have half-melted in this way at room temperature. The temperature at which this happens is called the glass temperature, Tq, for the polymer. Some polymers, which have no cross-links, melt completely at temperatures above T, becoming viscous liquids. Others, containing cross-links, become leathery (like PVC) or rubbery (as polystyrene butadiene does). Some typical values for Tg are polymethylmethacrylate (PMMA, or perspex), 100°C polystyrene (PS), 90°C polyethylene (low-density form), -20°C natural rubber, -40°C. To summarise, above Tc. the polymer is leathery, rubbery or molten below, it is a true solid with a modulus of at least 2GNm . This behaviour is shown in Fig. 6.2 which also shows how the stiffness of polymers increases as the covalent cross-link density increases, towards the value for diamond (which is simply a polymer with 100% of its bonds cross-linked. Fig. 4.7). Stiff polymers, then, are possible the stiffest now available have moduli comparable with that of aluminium. 

Fig. 24.2. A two-phase polymer alloy, mode by co-polymerising styrene and butadiene in polystyrene. The precipitates ore a polystyrene-butadiene copolymer.

Acrylonitrile improves the gloss, mechanical and chemical performances of polystyrene. Butadiene improves impact strength but alters weathering and optical properties for the alloys. 

Ni(COD)2], supported catalyst activated by treatment with AIEt2(OEt) Phosphinated cross-linked polystyrene Butadiene 3,5... 

Definitions of propellant abbreviations PSB = Polystyrene-butadiene copolymer AP = Ammonium perchlorate A1 - Aluminum ... 

The easiest technique to establish a polymer-photochromic molecule (PC) interaction is to dissolve the photochrome in a polymer solution from which the solvent is evaporated afterwards. DHI 7 has been incorporated by this technique into poly(methyl)- or poly( -butyl methacrylate), vinylidene chloride, acrylonitrile (Saran F), polycarbonate, and polystyrene-butadiene copolymer (Panarez). 

The DHI s may be solution cast with certain polymers. Examples of photochromic plastics prepared this way are poly (methyl methacrylate), poly (n-butyl methacrylate), copoly (vinylidene chloride-acrylonitrile) (e.g., SARAN F), polycarbonate, and polystyrene-butadiene (e.g., Panarez). 

Pelton RH (1988) Polystyrene and polystyrene-butadiene latexes stabilized by poly(A-isopropylacrylamide). J Polym Sci 26 9-18... 

Geveke, D.J. Danner, R.P., "Application of the Flory-Huggins Theory to the System Chloroform-Polystyrene-Butadiene Rubber," Polym. Eng. Sci., 31, 1527 (1991). 

Light cycle oil, a highly aromatic ECC product (e.g. 67% aromatics content) can be used as solvent for PS and PS-BD (polystyrene-butadiene) mixture, component of synthetic rubber. Arandes et al. [37] proved that this feed can be further successfully thermally or catalyticaUy cracked, giving mainly gasoline fractions. They contain a high quantity of valuable components for petrochemistry, styrene and C4 olefins. 

J. M. Arandes, J. Erena, M. J. Azkoiti, M. Olazar, and J. Bilbao, Thermal recycling of polystyrene and polystyrene - butadiene dissolved in a light cycle oil,. 1. Anal Appl Pyrol, 70, 747 (2003). 

In the annual figures (11) polystyrene resins are disclosed from 1942 through 1950. Styrene-acrylonitrile copolymers are disclosed in 1950. Care must be exercised in using these figures to see where styrenated alkyds are classified. Polystyrene polyesters are disclosed in 1945 polystyrene-maleic anhydride resins are disclosed in 1946 styrene-alkyd polyesters are disclosed in 1949 and 1950 polystyrene-butadiene copolymers are disclosed in 1949 and 1950. 

Standard window glass 9.8-13.8 28 Polystyrene-butadiene copolymer 15.7 6... 

The radiation-stable expls lack the high oxygen content found in proplnt additives and therefore give rise to low specific impulses when used in proplnt compns. If this cannot be tolerated, the use of K nitrate as an oxidizer with a polystyrene-butadiene binder should result in a very radiation-stable proplnt because of its high radiation stability, as shown by the tests on ElkPdr (Ref 167)... 

Useful film-forming resin adhesives include polyvinyl esters and ethers and their copolymers and interpolymers with ethylene and vinyl monomers, acrylic resins and their copolymers, polyvinyl alcohol, water dispersion of polyolefin resins, polystyrene copolymers such as polystyrene butadiene, polyamide resins, natural rubber dispersions, and natural and modified carbohydrates (starch or carboxycellulose). Particularly preferred for use are aqueous dispersions of polyvinyl acetate and vinyl acetate-ethylene copolymers. 

PPFA Plastics Pipe and Fittings Associa- PSB polystyrene butadiene rubber (GR-S,... 

Alkylation of biphenyl with cyclohexene gives dicyclohexylbiphenyl, which can be used as a secondary plasticizer for PVC. " " Synthesis of this plasticizer uses Friedel-Crafts reaction with aluminum chloride employed as a catalyst. The application data shows that weight loss and the retention of mechanical properties (tensile strength, elongation, and modulus) are greatly improved with this plasticizer. " A mixture of di- and tri-alkyl (usually propyl) biphenyls is used as a plastieizer for polystyrene, butadiene rubber, epoxy resin, and polyurethane. " ... 

Andrez, Polystyrene-butadiene resins, Anderson Development Co. 

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