Variation of linear alcohols’ activity coefficients, referred to aqueous solutions of methanol, ethanol and 1-propanol, in the presence of various types of surfactants, studied by reversed – Flow Gas Chromatography

Kotsalos, Efthimios; Sevastos, Dimitrios; Karaiskakis, George

doi:10.1016/j.fluid.2019.05.010

Cited by 3 publications

(1 citation statement)

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“…They found that increasing water concentration in the solvent phase led to a decrease in the solvent power and mass transport coefficient of acetone and ethyl lactate. Kotsalos et al 35 measured the activity coefficients of the three linear alcohols (methanol, ethanol, and 1‐propanol) in aqueous mixtures without and in the presence of surfactants. They showed that under constant temperature and pressure, the activity coefficient increases with the increase of the carbon number of the alcohol and decreases with the increase of the mole fraction of the alcohol.…”

Section: Introductionmentioning

confidence: 99%

The effect of alcoholic solutions on the thermomechanical properties of immersed poly(lactic acid) films

Auras

Sonchaeng

et al. 2022

J of Applied Polymer Sci

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The effects of aqueous and deuterium oxide (D 2 O) solutions of alcohols (methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol) on the thermomechanical properties of poly(lactic acid)-PLA-films were assessed by dynamic mechanical analysis. The glass transition temperature (T g ) of PLA films immersed in 25%, 50%, 75%, and 100% (v/v) alcoholic solutions were compared with the T g of films immersed in 100% water and D 2 O. The T g of PLA films immersed in methanol and ethanol aqueous solutions decreased as the concentration of the alcohol solutions increased. For methanol and ethanol, the T g decreased by 8.6 and 7.6 C per 25% (v/v) increase in alcohol, respectively. When the PLA films were immersed in propanol aqueous solutions and butanol, the T g reached the lowest value at 75% (v/v) and 100% (v/v), respectively. T g of PLA films immersed in 1-propanol and 2-propanol decreased by 8.6 and 8.9 C for every 25% increase in propanol before reaching the minimum value, respectively. Aqueous and D 2 O solutions had similar effects on T g . Selective studies of crystallinity evolution, ethanol sorption, degree of swelling, and Hansen solubility parameters of PLA were conducted. This work assists in developing PLA films intended for contact with aqueous-alcoholic solutions.

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Section: Introductionmentioning

confidence: 99%