Dynamics of Concentrated Polymer Solutions Revisited: Isomonomeric Friction Adjustment and Its Consequences was written by Yan, Zhi-Chao;Zhang, Bao-Qing;Liu, Chen-Yang. And the article was included in Macromolecules (Washington, DC, United States) in 2014.HPLC of Formula: 5444-75-7 The following contents are mentioned in the article:
In concentrated polymer solutions, the concentration (ϕ) dependence of the terminal relaxation time τd reflects ϕ-dependent changes of several factors, the monomeric friction ζ0(ϕ), the entanglement length, a(ϕ), and the correlation length, ξ(ϕ). Usually, the effect of the latter two factors on τd can be cast in a simple power law, τd ∼ ϕv. This power law form is to be examined for τd after correction of the changes of ζ0 with ϕ, but this iso-ζ0 correction is an unsettled problem. The correction based on the concept of “iso-free-volume” has been attempted in literatures. This study focused on four groups of solutions with different local frictional environments to examine universal validity of this correction. The isothermal data of τd were rheol. measured, and then corrected to the iso-frictional (iso-ζ0) state. After this correction, τd of most solutions in small mol. solvents showed the power law behavior τd ∼ ϕv with exponent of v = 2.0 ± 0.2, irresp. of the solvent type, either neutral small mols. or an ionic liquid (organic salt), and of the difference of the glass transition temperatures of the solvent and polymer. In contrast, the exponent became smaller (v ≈ 1.3) for the solutions in an oligomeric solvent. These results are discussed within the frame of the two-length scaling theory that considers changes of ξ and a with ϕ. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7HPLC of Formula: 5444-75-7).
2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.HPLC of Formula: 5444-75-7
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics