One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 2026-48-4, Name is L-Valinol, formurla is C5H13NO. In a document, author is Nechipadappu, Sunil Kumar, introducing its new discovery. Name: L-Valinol.
Synthesis of polyaramids in gamma-valerolactone-based organic electrolyte solutions
The current synthetic procedures for polyaramids mainly involve the use of amide solvents such as N-methylpyrrolidone and N,N-dimethylacetamide. However, these solvents are suspected to be teratogenic and are considered ‘Substances of Very High Concern’ by the European Commission. Here we propose a benign alternative solvent system: an Organic Electrolyte Solution (OES) consisting of gamma-valerolactone (GVL) and a small amount of the ionic liquid 1-methyl-3-octylimidazolium chloride, [C(8)MIm][Cl]. Three commercially relevant polyaramids were synthesized: poly-p-phenylene terephthalamide (PPTA), poly-m-phenylene isophthalamide (PMIA) and copoly(p-phenylene/3,4 ‘-diphenylether terephthalamide) (ODA/PPTA). PMIA was successfully synthesized in the OES containing [C(8)MIm][Cl] in a molar fraction of x(IL) = 0.043, achieving an inherent viscosity of eta(inh) = 1.94 +/- 0.064 dL g(-1), which is on par with the current industrial standard and the benchmark lab scale synthesis. The reaction mixture could also be directly used for the wet spinning of polyaramid fibers, and all components of the solvent could be recycled in good yields by a series of evaporation and distillation steps. ODA/PPTA could be synthesized, but only rather low inherent viscosities were achieved. The reaction mixture was too viscoelastic to be spun by our small-scale spinning setup. PPTA always instantly precipitated and could not be synthesized from a [C(8)MIm][Cl]/GVL OES. alpha-Picoline, the organic base which was added to capture the released HCl during the reaction, was found to play a pivotal role in the polymerization reaction. By undergoing an acid-base reaction with HCl, it forms a protic ionic liquid in situ which increases the solubility of the polymer.
If you are hungry for even more, make sure to check my other article about 2026-48-4, Name: L-Valinol.