Acetone, exposion properties

Many engineering thermoplastics (e.g., polysulfone, polycarbonate, etc.) have limited utility in applications that require exposure to chemical environments. Environmental stress cracking [13] occurs when a stressed polymer is exposed to solvents. Poly(aryl ether phenylquin-oxalines) [27] and poly(aryl ether benzoxazoles) [60] show poor resistance to environmental stress cracking in the presence of acetone, chloroform, etc. This is expected because these structures are amorphous, and there is no crystallinity or liquid crystalline type structure to give solvent resistance. Thus, these materials may have limited utility in processes or applications that require multiple solvent coatings or exposures, whereas acetylene terminated polyaryl ethers [13] exhibit excellent processability, high adhesive properties, and good resistance to hydraulic fluid. 

Evolution of reflectivity signals over time has been used to temporally resolve the constituents of a binary vapor mixture [102]. Since the studied solvents (ethanol and acetone) have identical refractive indices, changes in the optical reflectance of porous silicon exposed to these vapors were shown to depend upon the rates of diffusion and adsorption of these species into the material. Time-resolved refrac-tometry revealed that an equimolar mixture of acetone and ethanol vapors exhibited markedly different condensation within porous silicon than did the pure mixture constituents (figure 16.14). This method is comparable to gas chromatography in that the vapor mixture interacts with the matrix in a manner dependent upon the physical properties of its components, but the porous silicon device... 

Properties White crystals or powder phenolic odor. Mp 73-75C bp 267C. Darkens when exposed to light. Technical grade usually tan. Almost insoluble in water soluble in alcohol, acetone, chloroform, benzene, and in formic, acetic, hydrochloric, and sulfuric acids, and alkalies... 

The observation that albumin is soluble in acid alcohol and acid acetone seems to have remained unrecognized for more than 20 years (Cll, L18) until it was rediscovered in 1954 by Delaville et al. (D7, D8). Improved methods on a microscale, based on this property, have been devised (D5, D7, D8, W8). The phenomenon under discussion is probably due to the formation of the imexpanded F form of albumin at a pH between 3 and 4 when COOH ionization is repressed and hydrophobic surfaces of the molecule are exposed (F15). At this pH, a solvent of appropriate dielectric constant (DC) is required for solubilization 1 ml methanolic solution (DC 33) containing 0.1 ml water and 0.1 g TCA will dissolve 30 mg albumin similar ethanolic (DC 25) acetone (DC 21) and ether (DC 4) solutions will dissolve 3, 1, and 0.1 mg albumin, respectively. Other solvents and acids have been employed, e.g., dichloroacetic acid-acetone (Rl), dichloroacetic acid-ethylene dichloride (Yl), and hydrochloric acid-methanol (M20). With the use of phosphate buffer, pH 2.4, and ethanol (P6), albumin may be extracted quantitatively from liver ribosomes. 

In conclusion, the chemical properties of ZnO depend on the particular surface plane that is exposed. This surface specificity has now been demonstrated for the decomposition of 2-propanol, methanol, formaldehyde and formic acid, and adsorption and desorption of acetone, propene, water, CO, and CO2. These data have made possible better understanding of the results using ZnO powder. It will be intersting to se<5 how different are the catalytic properties of these surfaces. 

CHEMICAL PROPERTIES Generally stable hazardous polymerization will not occur develops acidity irom prolonged exposure to air and light addition to acetone in the presence of a base will result in a highly exothermic reaction reacts vigorously with disilane when exposed to sunlight FP (not available) AT (>1832°F). 

Properties Colorless gas, nat. gas odor easily liquefied under pressure at R.T. noncorrosive sol. in ether, alcohol, chloroform, org. soivs. si. sol. in water, acetone m.w. 44.09 sp.gr. 0.513 (0 C, as liq.), 1.56 (0 C, as vapor) f.p. -189.9 C b.p. -42.5 C flash pt. -104 C Toxicology OSHA PEL7TWA1000 ppm simple asphyxiant narcotic in high cones. overexposure may cause dizziness, disorientation, excitation liq. propane may cause frostbite to skin and eyes TSCA listed Precaution Flamm. dangerous fire hazard exposed to heat, flame explosive limits in air 2.4-9.5% vigorously reactive with oxidizers explosive as vapor exposed to heat or flame explosive with CIO violent exothermic reaction with barium peroxide, heat Hazardous Decomp, Prods. Heated to decomp., emits acrid smoke and irritating fumes... 

Properties Colorless clear vise, lig., odorless, si. acrid taste sol. in water, essential oils, acetone, chloroform, ether, ethanol misc. with oxygenated soivs. m.w. 76.11 dens. 1.0362 vapor pressure 0.08 mm (20 C) m.p. -60 C b.p. 188.2 C flash pt. (OC) 99 C Toxicology LD50 (oral, rat) 25 ml/kg, (IP, rat) 6660 mg/kg, (IV, rat) 6423 mg/kg, (skin, rabbit) 20,800 mg/kg si. toxic by ing., skin contact, IP,IV, subcut. routes eye and human skin irritant human systemic effects by ing. (anesthesia, convuisions, EEC changes) experimentai teratogen, reproductive effector mutagenic data TSCA iisted Precaution Combustibie exposed to heat or fiame expiosive as vapor exposed to heat or fiames expiosive iimits 2.6-12.6% reactive with oxidizers can increase risk of fire and expiosion Hazardous Decomp. Prods. Heated to decomp., emits acrid smoke and irritating fumes... 

Properties Wh. to yish.-wh. amorphous waxy solid, tallow-like odor and taste very si. sol. in water sol. in alcohol, ether, acetone, CCI, m.w. 284.47 dens. 0.847 (70 C) m.p. 69.3 C b.p. 383 C acid no. 195-200 iodine no. 4 max. flash pt. (CC) 385 F ref. index 1.4299 (80 C) Toxicology LD50 (IV, rat) 21.5 1.8 mg/kg poison by IV route human skin irritant possible sensitizer for allergic persons questionable carcinogen exjKrimental tumorigen by implant TSCA listed Precaution Combustible when exposed to heat or flame heals spontaneously... 

Properties Coloriess liq. or pale yel. cryst. sol. in most org. soivs. misc. with acetone, benzene, chlorofomt, dioxane, ethyl acetate, ethanol, xylene insol. in water m.w. 243.24 dens. 1.1133 (30 C) vapor pressure 1 mm (100 C) m.p. 27 C b.p. 120 C (5 mm) flash pt. > 176 F Toxicology LD50 (oral, rat) 590 mg/kg, (IV, mouse) 180 mg/kg poison by IV route toxic by ing. and inh. harmful solid TSCA listed Precaution Flamm. exposed to heat, flame, or oxidizers avoid contact with acid... 

Properties Water-wh. liq. sol. in alcohol, acetone, toluene insol. in water, petrol, naphtha m.w. 154.10 dens. 1.120-1.125 (25/40 C) flash pt. (COC) HOC ref. index 1.429 Toxicology Toxic and corrosive strong irritant to skin and tissue TSCA listed Precaution DOT Corrosive material combustible when exposed to heat or flame Hazardous Decomp. Prods. Heated to decomp., emits highly toxic fumes of POx Uses Catalyst in coatings, inks, for appliance, automotive, floor, furniture, paper, and other... 

Formula CH2 CHCOOCH2CH(C2Hs)C4H9 Properties Pale yel. clear liq. pleasant odor sol. in 95% ethanol, acetone sol. 10-50 mg/ml in DMSO insol. in water m.w. 184.31 dens. 0.8867 (20/20 C) vapor pressure 0.01 mm Hg (20 C) m.p. -90 C b.p. 214-218 C flash pt. (OC) 82.2 C Toxicology LD50 (oral, rat) 5660 mg/kg, (IP, rat) 1670 mg/kg, (skin, rabbit) 8480 mg/kg mod. toxic by ing. and IP routes very low toxicity by skin contact severe skin and eye irritant experimental tumorigen TSCA listed Precaution Flamm. fire hazard exposed to heat or flame heat-sensitive can react with oxidizing materials hydrolyzes polymerizes readily... 

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