Biodegradable polymer-phase behavior: Liquid-liquid equilibrium of ethyl lactate and poly(lactic acid)

resumo

Liquid-liquid equilibrium data of ethyl lactate and poly(lactic acid) binary mixtures were measured at 0.1 MPa nominal pressure in the temperature range from (260 to 265) K. Cloud-point temperatures were measured using a dynamic method with visual detection of phase transitions (naked-eye determination of turbidity). This system exhibits an upper critical solution temperature (UCST) at T-c = 265.1 K and w(PLA,c) = 0.03776. The experimental data were modeled with the PC-SAFT equation of state, and new parameters for both compounds within the PC-SAFT frame are provided. The model correlates well with the observed experimental data.

palavras-chave

CARBON-DIOXIDE; GAS SOLUBILITY; HIGH-PRESSURES; CLOUD POINTS; CHLORODIFLUOROMETHANE; MIXTURES; POLY(L-LACTIDE); SORPTION; STATE; SAFT

categoria

Thermodynamics; Chemistry; Engineering

autores

Ferreira, R; Pedrosa, N; Marrucho, IM; Rebelo, LPN

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