Polar aprotic solvents such as acetone, tetrahydrofuran, acetonitrile, and dimethylformamide resulted in slow and controlled polymer swelling, inducing conversion of SP to the colored merocyanine. This suggests control of the mechanical activation through swelling and not just standard mechanical extension ...
DMAP (m.p. 112-113°C) and PPY (m.p. 57-58°C) are colorless, crystalline substances which are very soluble in methanol, ethyl acetate, chloroform, methylene chloride, 1,2-dichloroethane, acetone, and acetic acid and less soluble in cold hexane, cyclohexane, and water. DMAP can be rec...
Methylated spirits are mainly composed of ethyl alcohol, otherwise known as ethanol. Other additives in methylated spirit, such as methanol, isopropyl alcohol, acetone, and other substances which make it toxic to deter people from drinking it.Answer and Explanation: Ethanol has two carbon atoms bond...
Out of acetone and ethanol, which solvent is more polar? Explain why. Explain chemically between the following pairs of substances in one or two steps. KI and Na_2SO_4 solution. What are homogenous and heterogeneous substances? Is distilling whisky a physical or chemical change? Explain. ...
Reaction of DMAP with acetylenedicarboxylic acid leads spontaneously to the bis-adduct in high yields. On reaction with perbenzoic acid the strongly polar N-oxide is formed. Nitration of DMAP with HNO3/H2SO4 gives the 3-nitro derivatives in 81 % yield and, under forcing condition; the 3,5...
of an organic solvent which contains at least one organic aprotic solvent sufficiently polar to be able to ionize a complex of an amine and SO 2 the mol. ratio of amine: SO 2 not exceeding 4 : 1. Aprotic solvents disclosed are DMSO, DMF and acetonitrile which may be used together with...
As examples of such treatment may be mentioned inter alia heating the membrane, preferably in a substantially dry state, and preferably above the Tg of the polymer, under an inert atmosphere; and treatment with a polar aprotic solvent, for example acetone, dimethyacetamide (DMA), ...
of an organic solvent containing at least one organic aprotic solvent which is sufficiently polar to be able to ionize N 2 O 4 . Aprotic solvents disclosed are DMF, DMA, THF, DMSO, acetonitrile, sulpholan and ethylene carbonate. The solution may contain another polymer, e.g. polyacrylonitrile...