Solvent, goodness

The HCl by-product of the amidation reaction is neutralized by also dissolving an inorganic base in the aqueous layer in interfacial polymerization. The choice of the organic solvent plays a role in determining the properties of the polymer produced, probably because of differences in solvent goodness for the resulting polymer. Since this reaction is carried out at low temperatures, the complications associated with side reactions can be kept to a minimum. 

This alternative notation is especially suited to describe changes in solvent goodness which arise from temperature variations for a fixed system. By contrast, the x notation is more descriptive of different solvents at a single temperature. 

For conditions of intermediate solvent goodness, a shows a dependence on M which is intermediate between the limits described in items (1) and (2) with the corresponding intermediate values for the Mark-Houwink a coefficient. 

Heat aging Solvents Good Very good Good Excellent Excellent Excellent Good Fair Excellent... 

TFE (solid) 500 Excellent resistance to almost all chemicals and solvents. Good heat resistance ... 

Polybenzaylene benzimidazoles (pyrrones) Polybenzoxazoles Thermally stable to 600°C (1112°F) insoluble in common solvents good mechanical properties. Stable in air to 500°C (932°F) insoluble in common solvents except sulfuric acid nonflammable chemical resistant film. 

Chiappe and co-workers reported chloroperoxide (CPO)-catalyzed oxidation in hydrophilic ILs as co-solvents (Fig. 21). The authors investigated the hydrophilic ILs on the activity of CPO and found that CPO showed a higher tolerance toward IL than organic solvent good activity was obtained when the reaction was carried out in a mixed solvent of [mmim][Me2P04] and buffer (pH 5.0) (1 1) rather than buffer solution. 

Another important reductive coupling is the conversion of esters to a-hydroxyketones (acyloin condensation).267 This reaction is usually carried out with sodium metal in an inert solvent. Good results have also been obtained for sodium metal dispersed on solid supports.268 Diesters undergo intramolecular reactions and this is also an important method for the preparation of medium and large carbocyclic rings. 

Whereas in alcohols as solvents good yields of esters are obtained a self-condensation of the ester was observed in THF.[123]... 

Solvents Good behaviour up to 60°C except with aromatics, chlorinated solvents, certain oxidants... 

Solvents Good behaviour at room temperature except aromatics and chlorinated solvents and to some extent aliphatic hydrocarbons, ketones, gasolines, kerosene... 

Solvents Good behaviour with aliphatic hydrocarbons Attacked by aromatic hydrocarbons, chlorinated solvents, esters, ethers and ketones Variable resistance to oils, greases, alcohols... 

Solvents Good behaviour with aliphatic hydrocarbons. 

Solvents Good to limited resistance against vegetable oils, saturated aliphatic hydrocarbons, polyglycols and ... 

Solvents Good behaviour with most strong mineral and organic adds, aromatic and aliphatic hydrocarbons, ... 

Solvents Good behavioiu- except aromatic hydrocarbons, chlorinated solvents, certain aliphatic hydrocarbons, some... 

Solvents Good to limited behaviour with aliphatic hydrocarbons at ambient temperature Unsatisfactory behaviour with chlorinated solvents, aromatic hydrocarbons, ketones. .. 

Clear, easily colored easily fabricated transparent fair mechanical and thermal properties good resistance to acids, bases, oxidizing, and reducing agents readily attacked by many organic solvents good electrical insulator... 

The choice of carrier liquid is primarily based on the suspension stability for colloids or solvent goodness for macromolecule solutions. Moreover, surface-charged colloidal particles are also sensitive to ionic strength and addition of surfactants. 

Solvent-Based Adhesives—In these the adhesive flows because it is dissolved in an appropriate solvent, and solidification occurs on evaporation of the solvent. Good bonds are usually formed if the solvent attacks or actually dissolves some of the plastic adherend to produce a solvent-welded bond. 

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