Hydroquinone di-

Formal potentials can be defined on different levels of conditions Thus the formal potential of the -> quinhydrone electrode may be defined (I) as including (a) the standard potential of the hydroquinone di-anion/quinone system, (b) the two acidity constants of the hydroquinone, and (c) the activity coefficients of the hydroquinone dianion and quinone, or, (II), it may also include (c) the pH value. In the latter case, for each pH value there is one formal potential, whereas in the first case one has one formal potential for all pH values, and an equation describing the dependence of the electrode potential as a function of that formal potential and the individual pH values. Formal potentials are strictly thermodynamic quantities, and no kinetic effects (e.g., by electrochemical -> irreversibility) are considered. 

Trinitrohydroquinone-dimethylether, yel ndls (from ale), mp 100—01° diffc sol in hot 80% ale almost insol in cold ale prepd by treating cold soln of hydroquinone-di methylether in acetic acid with a cold mixt of HNO3 1 part 8i coned H2SO4 2 parts (Ref 9) Other methods of prepn props are found in the Refs... 

A number of different hindered diamines have been investigated as a substitute for MOCA (1). In addition to diamine curing agents, which are used most frequently with elastomers based on polyether polyols and toluene diisocyanate (TDI), prepolymers based on polyether or polyester polyols and 4,4 -diphenylmethane diisocyanate (MDI), can be cured with diols to yield elastomers with similar properties to those of diamine-cured polyester-TDI elastomers. The most common chain extender is butanediol. However, to achieve improved mechanical properties, especially at elevated temperatures, aromatic diols are often used. The most common one is hydroquinone di-(beta-hydroxy-ethyl) ether (HEQ). 

HEQ Hydroquinone di (beta-hydroxyethyl) ether Tennessi Eastman ... 

Resorcinol diols are superior to the well known hydroquinone di(beta-hydroxyethyl) ether (HQEE), which is a solid with a melting point of 100 °C ... 

Hydroquinone diethylol ether Hydroquinone di (2-hydroxyethyl) ether Hydroquinone di-(P-hydroxyethyl) ether. See Hydroquinone bis (2-hydroxyethyl) ether Hydroquinone dimethyl ether. See p-Dimethoxybenzene Hydroquinone ethyl ether CAS 622-62-8 FEMA 3695... 

Hydroquinone (di- 3-hydroxyethyl) ether (HQEE) and 1,4-butanediol (BD) were obtained from commercial sources. 

Hydroquinone di()8-Hydroxyethyl) ether (HQEE) n. A white solid material used as a reactant in the preparation of polyesters, polyolefins, and polyurethanes. As a chain extender in urethane prepolymers, HQEE increases to 150°C the high-temperature resistance of parts molded from the prepolymer. 

Hydroquinone bis-(befa-hydroxyethyl) ether Hydroquinone di-(2-hydroxyethyl) ether... 

---