polar solvent


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polar solvent

[′pō·lər ′säl·vənt]
(materials)
A solvent in whose molecules there is either a permanent separation of positive and negative charges, or the centers of positive and negative charges do not coincide; these solvents have high dielectric constants, are chemically active, and form coordinate covalent bonds; examples are alcohols and ketones.
References in periodicals archive ?
Many researchers calculated TPC from different parts of plants and most of them reported significantly higher values of TPC obtained by using polar solvents [42, 43].
The use of polar solvents allows high yields to be obtained due to the ability of these solvents to break up the forces that bind lipids in the vegetable matrix (AQUINO et al.
3, this decreasing linear zone is observed, for association solvents and for polar solvents starting at least from 60[degrees]C, but is not observed for dispersion solvents.
The annealing at 50, 70, 90 and 110[degrees]C for 30 minutes and at room temperature 30[degrees]C, make a decision the presence of the [beta]-phase in PVDF films by using the same polar solvent.
Also, adding a less polar solvent, such as propylene glycol, was expected to help open the protein structure for better protein coalescence, wetting of wood, and reaction with the PAE polymer, but no substantial improvement in wet bond strength was seen with the addition of propylene glycol to soy flour adhesives.
Moreover, since p-TNC4 possesses nitro groups that may interact with these polar solvents and gives blue shifting in less polar solvents like CF, DCM.
Ethanol is also a polar solvent that forms hydrogen bonds with its solutes.
Here, we report that most of the > 500 commercially available plastic products that we sampled--even those that are presumably BPA free--release chemicals having detectable EA, especially if they are assayed by more polar and less polar solvents and exposed to common-use stresses.
Higher Log P values are not suitable since the desired amount of water from the enzyme was stripped off by the polar solvent, automatically reducing enzyme activity.
Tenders are invited for Supply of 1)Alcohol Resistant Film- Forming Fluoroprotein Foam (Ar-Fffp 3X3 Percent ) Concentrate Suitable For Extinguishing Flamable Hydrocarbon And Polar Solvent Liquid Fire, Confirming Ul-162.
These results suggest that the PANI prepared by this method is easy to be dispersed and stabilized in water as well as polar solvent, by forming hydrogen bonds with a small amount of residual EG molecules which have also hydrogen bonding with water or the polar solvents.
SFC performs chromatographic separations by creating programmed composition gradients of methanol, or a less polar solvent, in carbon dioxide.