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Previous issue date: 2012-07-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / 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 (??). The ?? 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 / O principal objetivo deste trabalho foi o desenvolvimento de uma nova metodologia para
determina??o de dados de equil?brio termodin?mico em misturas l?quidas e polim?ricas. Tr?s
metodologias foram propostas utilizando a Microextra??o em Fase S?lida (SPME) para
determina??o dos coeficientes de atividade em dilui??o infinita (??) de sistemas l?quidos. Os
valores de ?? de 9 hidrocarbonetos foram determinados em furfural nas temperaturas de 25,
35 e 45 ?C. Foram determinados valores de coeficiente de parti??o l?quid-g?s (KLg) em cada
uma das temperaturas estudadas. Nos experimentos envolvendo as misturas l?quidas, foi
observada uma alta taxa de sor??o de solvente podendo ocasionar o inchamento e poss?vel
quebramento das fibras de SPME. Para verificar o poss?vel inchamento, foram conduzidos
testes estat?sticos antes e depois de cada amostragem. Foi proposto ainda uma metodologia
para determinar os par?metros de Flory em polidimetilsiloxano (PDMS) e poliacrilato (PA)
utilizando a SPME. Nesse caso, os mesmos 9 hidrocarbonetos tiveram seus par?metros de
Flory determinados na faixa de temperatura 25 a 80 ?C para o PDMS e de 50 a 90 ?C para o
PA. As metodologias foram avaliadas atrav?s da compara??o dos dados obtidos com dados da
literatura. Todos os resultados foram satisfat?rios, sendo ainda obtidos os valores dos
par?metros de solubilidade de Hildebrandt, que para o poliacrilato, eram inexistentes na
literatura
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:jspui/1604 |
| Date | 26 July 2012 |
| Creators | Furtado, Filipe Arantes |
| Contributors | Coelho, Gerson Luiz Vieira, Tavares, Frederico Wanderley, Almeida , Andr? de |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Engenharia Qu?mica, UFRRJ, Brasil, Instituto de Tecnologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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