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 ...
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), ...
During the optimization it was observed that the reaction did not proceed in solvents like acetone, 1,4-dioxane, acetonitrile (Table 1, entries 2, 3, and 4). The use of polar aprotic solvent, such as DMSO gave a poor yield of the product (25%) (Table 1, entry 5). Switching the ...
Which is a polar aprotic solvent? a. 2-methyl-2-propanol b.CH_3CH_2CH_2OCH_2CH_2CH_3 c.NH_3(I) d.2-methylhexane e.CCI_4 Identify the alkyl halide that reacts the fastest in an S_N1 reaction. A) 2-chloro-2-methylpropane. B) 2-chlorobutane. C) 1-chlorobutane....
A cellulose solution comprises one part by wt. of cellulose, at least 6 moles of NO 2 per anhydroglucose unit of cellulose and at least 4 parts by wt. of an organic solvent containing at least one organic aprotic solvent which is sufficiently polar to be able to ionize N 2 O 4 . ...
Suitable solvents for use in the reaction of formula (II) with the compound of formula (VII) to prepare vc-seco-DUBA are, without limitation, organic solvents, preferably aprotic solvents, more preferably polar aprotic solvents. Preferred solvents are ether solvents, amide solvents or mixtures ther...
A cellulose solution comprises at least one part by wt. of cellulose, at least 25 moles each of SO 2 and an amine per anhydroglucose unit of the cellulose and at least 4 parts by wt. of an organic solvent which contains at least one organic aprotic solvent sufficiently polar to be able...