Enthalpy changes upon dilution and ionization of poly(L-glutamic acid) in aqueous solutions

Article Abstract:

The enthalpy changes accompanying the dilution and ionization of poly(L-glutamic acid) in water is measured at 25 degree Celsius for two degrees of polymerization at various degrees of ionization, alpha for a concentration range from about 0.2 to 0.002 monomol/L. An endothermic heat effect, produced by an additional conformational transition in the dilution process, is superimposed on the exothermic enthalpy of dilution, and it overweighs the latter in the region of alpha where the conformational transition is prevailing.

Glutamate, Ionization, Enthalpy

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Cationic and anionic poly(N-isopropylacrylamide) based submicron gel particles: Electrokinetic properties and colloidal stability

Article Abstract:

A cationic and an anionic poly(N-isopropylacrylamide) (poly(NIPAM)) microgel latex are synthesized through batch radical polymerization under emulsifier-free conditions and their hydrodynamic properties, colloidal stability and electrokinetic characteristics are investigated. The differences between the properties of both latexes are justified by the presence of a hydrophilic comonomer, aminoethyl methacrylaye hydrochloride (AEMH), in the cationic microgel.

Amides

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Chemical and photoluminescence properties of purified poly(2-methoxyaniline-5-sulfonic acid) and oligomer

Article Abstract:

The study explains the chemical, as well as the photoluminescence properties of the purified poly(2-methoxyaniline-5-sulfonic acid) (PMAS) compound and its oligomer. The analysis reveals that any change in pH or any oxidizing and reducing agent have no effect on these properties.

Industrial Organic Chemicals, Cyclic crudes and intermediates, Cyclic Crude and Intermediate Manufacturing, Aniline, Sulfonic Acids, Oxidation-reduction reaction, Oxidation-reduction reactions, Photoluminescence, Oligomers

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