Carbon dioxide stability

DA Canelas, JM DeSimone. Dispersion polymerizations of st5 rene in carbon dioxide stabilized with poly(styrene-fc-dimethylsiloxane). Macromolecules 30 5673-5682, 1997. 

V Kasche, R Schlothauer, G Brunner. Enzyme denaturation in supercritical carbon dioxide stabilizing effect of disulfide bonds during the depressurization step. Biotechnol Lett 10 569-574, 1988. 

Group II hydrogencarbonates have insufficient thermal stability for them to be isolated as solids. However, in areas where natural deposits of calcium and magnesium carbonates are found a reaction between the carbonate, water and carbon dioxide occurs ... 

BiaxiaHy orieated PPS film is transpareat and nearly colorless. It has low permeability to water vapor, carbon dioxide, and oxygen. PPS film has a low coefficient of hygroscopic expansion and a low dissipation factor, making it a candidate material for information storage devices and for thin-film capacitors. Chemical and thermal stability of PPS film derives from inherent resia properties. PPS films exposed to tolueae or chloroform for 8 weeks retaia 75% of theh original streagth. The UL temperature iadex rating of PPS film is 160°C for mechanical appHcatioas and 180°C for electrical appHcations. Table 9 summarizes the properties of PPS film. 

Raw juice is heated, treated sequentially with lime (CaO) and carbon dioxide, and filtered. This accomplishes three objectives (/) microbial activity is terminated (2) the thin juice produced is clear and only lightly colored and (J) the juice is chemically stabilized so that subsequent processing steps of evaporation and crystalliza tion do not result in uncontrolled hydrolysis of sucrose, scaling of heating surfaces, or coprecipitation of material other than sucrose. 

Polymers. In combination with various metal salts, sorbitol is used as a stabilizer against heat and light in poly(vinyl chloride) (qv) resins and, with a phenohc antioxidant, as a stabilizer in uncured styrene—butadiene mbber (qv) compositions and in polyolefins (see Heat stabilizers Olefin POLYMERS Rubbercompounding). Heat-sealable films are prepared from a dispersion of sorbitol and starch in water (255). Incorporation of sorbitol in coUagen films gready restricts their permeabiUty to carbon dioxide (256). 

Chemical Reactivity - Reactivity with Water Slow, non-hazardous. Form carbon dioxide gas Reactivity with Common Materials data not available Stability During Transport Stable Neutralizing Agents for Acids and Caustics Not pertinent Polymerization May occur slowly. Is not hazardous Inhibitor of Polymerization Not pertinent. 

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