Poly aromatics ethylene oxide

Solubility. Poly(ethylene oxide) is completely soluble in water at room temperature. However, at elevated temperatures (>98° C) the solubiUty decreases. It is also soluble in several organic solvents, particularly chlorinated hydrocarbons (see Water-SOLUBLE polymers). Aromatic hydrocarbons are better solvents for poly(ethylene oxide) at elevated temperatures. SolubiUty characteristics are Hsted in Table 1. 

Aromatic hydrazines, 13 573 Aromatic hydrocarbons, 18 593 biodegradability of, 25 826 composition of, 25 168 as diluents, 10 430 fluorinated, 11 866 nitration of, 17 161 separation of, 10 782-785 as solvents for poly(ethylene oxide),... 

Together with China Petroleum Chemical Corp. (Sinopec) in a 50-50 partnership, BASF planned to build its first Verbund project in East Asia - an integrated petrochemical site (IPS) on 220 hectares of land. The core of the project was an ethylene cracker with a capacity of 600,000 tons per year. Nine new plants downstream would be supplied by the cracker, producing 1.7 million metric tons of chemical products for local consumption, including ethylene, aromatics, poly-ethylenes, ethylene oxide and ethylene glycols, acrylic acid, acrylates, oxo alcohols, formic acid, propionic acid, methylamine, and dimethylformamide. 

Commercial poly(ethylene oxide) resins supplied in the molecular weight range 1X10 -5X10 are dry, free-flowing, white powders soluble in an unusually broad range of solvents. The resins are soluble in water at temperatures up to 98°C and also in a number of organic solvents, which include chlorinated hydrocarbons such as carbon tetrachloride and methylene chloride, aromatic hydrocarbons such as benzene and toluene, ketones such as acetone and methyl ethyl ketone, and alcohols such as methanol and isopropanol. 

Note that, in some studies, poly(ethylene oxide) oligomers, micelle-forming surfactants derived from them, and their complexes were used to perform such reactions in aqueous and alcohol solutions as hydroformylation [31-33], Wacker oxidation [34,35], hydroxylation of aromatic compounds [36-38], carbon dioxide hydrogenation [39], and epoxidation [40]. It was shown that using poly(ethylene oxide)s substantially increases the reaction rate and, in some cases, allows us to separate a metal complex containing oligo(ethylene oxide) [31,40]. 

Hurter, P. N. and Hatton, T. A., Solubilization of polycyclic aromatic hydrocarbons by poly(ethylene oxide-propylene oxide) block copolymers micelles effects of polymer structure, Langmuir, 8, 1291-1299 (1992). 

More recently, Tigelaar et al. have developed an alternative polymer membrane to Nafion that contains rigid sulfonated aromatic backbones linked with diamine-terminated poly-(ethylene oxide) (PEO) oligomers. This polymer was developed to increase the amount of ionic liquid in the membrane, where in Nafion, the perfiuorinated nature was thought to be reducing the uptake. The polymer membranes were soaked with a 1 1 mixture of a PIL and water, where the PILs trialed contained the imidazolium cation with either sulfate, triflate, or TFSI anions. The highest conductivity obtained with these polymer membranes was 50 mS/cm at 150 °C with imidazolium—CF3SO3H. ... 

The partial molar quantities of mixing were determined for normal and branched alkanes (O5 — Cio), cyclohexane, benzene and tetrachloromethane in polyisobutylene [57]. Partial molar enthalpies of mixing were measured for normal alkenes in low and high density polyethylene, polypropylene, polybutene-1, polystyrene, poly(methyl acrylate), poly(vinyl chloride), polyCN-isopropyl-acrylamide), ethylene-vinyl acetate copolymer, ethylene-carbon oxide copolymer [88] normal, branched and cyclic alkanes, benzene, n-butylbenzene, ois- and ra s-decalin, tetraline and naphthalene in polystyrene at 183, 193 and 203°C [60] these solutes in poly (methyl acrylate) [57] n-nonane, n-dodecane and benzene in polystyrene in the range 104.8 — 165.1 C [71] O7—C, C12 normal alkanes and aromatic hydrocarbons in polystyrene at an average temperature of 204.9°C [72], C7—Cg normal alkanes in poly(ethylene oxide) at an average temperature of 66.5 "C [72] normal alkanes in ethylene oxide—propylene oxide block copolymers (Pluronics L 72, L 64 and F 68) at the same average temperature [72]. 

Block and graft copolymer systems have also invoked interest with studies on poly(m-phenylene-isophthalamide)-fe-ethylene oxide or -h-dimethylsiloxane systems where conditions have been established for (AB) and triblock ABA and BAB synthesis. Poly(m-phenylene-isophthalamide) has been grafted with acrylonitrile following metallation in liquid ammonia. Regular copolyamide sequences have been prepared by a two-stage low-temperature solution polymerization yielding biphenylene terephthalamide-adipamide and dimethyl piperazine terephthalamide-adipamide copolymers. The preparation of regular aliphatic-aromatic copolyoxamides from diamine-oxamides and aromatic diadd... 

The so-called segmented polyurethanes form thermoplastic elastomers of the-(-AB type, where A is usually a polyether such as poly(ethylene oxide) and B contains aromatic urethane groups (142,143). These polyurethanes make excellent elastic fibers that stretch about 30% and are widely used in undergarments under the trade names Spandex and Lycra . 

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