Determinação dos coeficientes de atividade em diluição infinita de hidrocarbonetos em furfural e parâmetros de flory em sistemas poliméricos por HSSPME- GC/FID

Abstract

The main objective of this work was the development of a methodoly using the Solid Phase Microextraction (SPME) on determinations of thermodynamic equilibrium data of liquid and polymeric mixtures. Three methodologies were proposed for determination of infinite dilution activity coefficient of solutes in liquid mixtures (γ∞). The γ∞ values were determined for 9 hydrocarbons in the solvent furfural at temperatures of 25, 35 and 45 °C. The liquid-gas partition coefficients were also determined in each studied temperature. On the experiments involving liquid mixtures, high sorption of solvent was observed, which may lead to swelling the polymer coating phase. Statistical tests were conducted after each experiments to measure possible damages on fiber coatings. There was also proposed a methodology using the SPME to determine the Flory Huggins parameter of the nine hydrocarbons used as solutes in polydimethylsiloxane (PDMS) and polyacrylate (PA). The Flory parameter were determined at temperature range of 25 to 80 °C for the PDMS and 50 to 90 °C for the PA. The proposed methodologies were evaluated through comparison of the obtained data with literature. All the results agreed with literature data. The Hildebrandt solubility parameter for PA was not available on literature and was determined on these experiments for the first time