Solubility, partial

Initial investigations of base-catalyzed imidization of polymeric systems, in particular PMDA/ODA based polyfamic alkyl esters), have been difficult due to the insolubility of the polyimide precursor at imidization levels exceeding 40%. Nevertheless, preliminary studies indicate that the base-catalyzed polymer imidization reaction appears to be significantly slower at ambient temperatures as compared to the phthalamide model compounds. It is yet unclear whether this is a direct result of the conformational aspects associated with the polymer chain or solubility considerations arising from the less soluble, partially imidized polymer chain. Since much of the initial work involved IR studies of supported... [Pg.144]

Record on the Report Sheet whether the solid dissolved completely (soluble), partially (slightly soluble), or not at all (insoluble). [Pg.177]

The acidity constant of a given acid in any solvent SH can then be calculated from Eq. (4-15) when its acidity constant in water at infinite dilution, the acidity constant of another acid HB in water and in solvent SH, and the activity term are all known. The values y A 7hb can be obtained from solubilities, partial pressures, distribution coefiicients, etc. The ratio /y can be determined potentiometrically, or from the solubility of salts. The values of. STsh calculated in this way correspond satisfactorily with the measured values. [Pg.99]

Chitin A natural polysaccharide obtained from crab shells The chain is based on acetylated glucosamine units the natural polymer can be converted to the acid-soluble partially deacetylated product chitosan... [Pg.160]

All esterification processes with acetic anhydride yield the fully esterified ester as the first soluble product. If the reaction medium is a solvent for the triester a solution is obtained, and if a reaction which retains the fiber structure is employed, samples taken at intervals are all insoluble in solvents until complete esterification is attained. The process in this way differs from nitration, in which soluble, partially esterified products are obtained by adjustment of the concentration of the nitration acids. In the etherification of cellulose, the ethers (e.g., methylated cellulose) prepared by partial substitution are also soluble products, exhibiting continuous, gradual changes in solubility characteristics with increasing substitution. [Pg.314]

Solubility partially miscible with water and most organic solvents. [Pg.271]

Solubility (0.1 mM Phosphate buffer) pH 7.0 Soluble Partially Insoluble... [Pg.150]

Soluble, partial dissociation in solution (207pb NMR) X-ray Pb and Nb six coordinate Evidence from phase diagram... [Pg.42]

THE SOLUBILITY. PARTIAL MOLAL VOLUME. AND DIFFUSIVITY OF HELIUM IN LIQUID METHANE. PH.D. THESIS. [Pg.167]

The acylation of cellulose with acid chlorides in DMA/LiCl is most suitable for the homogeneous synthesis of readily soluble partially functionalized long-chain aliphatic esters and substituted acetic acid esters (Table 16.3). In contrast to the anhydrides, the fatty acid chlorides are soluble in the reaction mixture and soluble polysaccharide esters may be formed with a very high efficiency. Even in the case of stearoyl chloride, 79 per cent of the reagent is consumed for the esterification of cellulose. [Pg.347]

Nordtveit, R.J., Varum, K. M., andSmidsrod, 0.1994. Degradation of fully water soluble partially Af-acetylated chitosan with lysozyme. Carbohydrate Polymers, 23 253. [Pg.213]

On-column injection produces no problems with strongly water-soluble (fully trapped) solutes, few or negligible problems with water-insoluble solutes (non-trapped), and some problems with solutes of intermediate solubility (partially trapped). Splitless GC injection can only be used for strongly soluble solutes. [Pg.4994]

Calcium hydroxide Ca(OH)2 Partially soluble Partially soluble 0.185 (0°C) Occasiontil... [Pg.258]

Solubility in water Insoluble Insoluble Insoluble Partially soluble Partially soluble Partially soluble... [Pg.96]

Add 0.025 g of tetraphenylcyclopentadienone to a dry test tube. Add 1 mL of methyl alcohol to the tube and shake for 60 seconds. Is the solid soluble, partially soluble, or insoluble Explain your answer. [Pg.16]

From this, a system of soluble partial differential equations can be derived where the accompanying conditions are the following ... [Pg.345]

Solubility partially sol cold water insol in organic solvents. Preparative Method prepared by oxidation of thiourea with hydrogen peroxide. ... [Pg.540]

This new catalytic system was then tested for oxidation of various alkyl aromatic hydrocarbons (Table 12.3). The result showed that the selectivity of a conventional homogenous oxidation, which induces oxidative a-P carbon bond cleavages, could be influenced by utilizing this microemulsion method in SCCO2 (only partial oxidation took place). The different observed selectivity toward partial oxidation products can be explained in terms of solvent polarity. This approach makes the C02-soluble partial oxidation products less accessible to the water-soluble catalyst, preventing over-oxidations. The catalytic system was... [Pg.390]

K.M.V. Ragnhild J. Nordtveit, Degradation of fully water-soluble, partially N-acetylated chitosans with lysozyme, Carbohydr. Polym., 4, 253-260, 1994. [Pg.187]

Propylene Glycol t-butyl ether Insoluble Soluble Partially Soluble Soluble... [Pg.151]

Felix Candela, Hacia Una Nueva Filosophia De Las Estructuras (1962). The pursuit of elegance permeates the work soluble partial-differential equations yield beautiful simple edge profiles. [Pg.223]

S.2.4.2 Using a soluble partially-conjugated precursor polymer... [Pg.412]

Tenqperature Limits Process up to at least 350C (662F) Solubility Partially soluble in organic solvents Chemical Nature Neutral Apparent Density 0.27 g/cm3... [Pg.198]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...