Made available in DSpace on 2014-12-17T15:42:14Z (GMT). No. of bitstreams: 1
RosemiroMB_DISSERT.pdf: 2340991 bytes, checksum: c71ab28274a335ce511c0a85fd6c1157 (MD5)
Previous issue date: 2014-01-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The knowledge of the rheological behavior of microemulsionated systems
(SME) is of fundamental importance due to the diversity of industrial applications of these
systems. This dissertation presents the rheological behavior of the microemulsionated system
formed by RNX 95/alcohol isopropyl/p-toulen sodium sulfonate/kerosene/distilled water with
the addition of polyacrylamide polymer. It was chosen three polymers of the polyacrylamide
type, which differ in molar weight and charge density. It was studied the addition of these
polymers in relatively small concentration 0,1% in mass and maximum concentration of
2,0%. It was made analysis of flow to determine the appearing viscosities of the SME and
rheological parameters applying Bingham, Ostwald de Waale and Herschell-Buckley models.
The behavior into saline environment of this system was studied for a solution of KCl 2,0%,
replacing the distilled water. It was determined the behavior of microemulsions in relation
with the temperature through curves of flow in temperatures of 25 to 60?C in variations of
5?C. After the analysis of the results the microemulsion without the addition of polymer
presented a slight increase in its viscosity, but it does not mischaracterize it as a Newtonian
fluid. However the additive systems when analyzed with low concentration of polymer
adjusted well to the applied models, with a very close behavior of microemulsion. The higher
concentration of the polymer gave the systems a behavior of plastic fluid. The results of the
temperature variation point to an increase of viscosity in the systems that can be related to
structural changes in the micelles formed in the own microemulsion without the addition of
polymer / O conhecimento do comportamento reol?gico de sistemas microemulsionados
(SME) ? de fundamental import?ncia, devido ? diversidade de aplica??es industriais desses
sistemas. Esse trabalho apresenta o comportamento reol?gico do sistema microemulsionado
formado por RNX 95/?lcool isoprop?lico/p-tolueno sulfonato de s?dio/Querosene/?gua
destilada com a adi??o do pol?mero poliacrilamida. Foram escolhidos tr?s pol?meros do tipo
poliacrilamida, que diferem quanto a massa molar e sua densidade de carga. Estudou-se a
adi??o desses pol?meros em concentra??o relativamente baixa 0,1% em massa e concentra??o
m?xima de 2,0%. Foram realizadas an?lises de escoamento para a determina??o das
viscosidades aparente dos SME e par?metros reol?gicos aplicando os modelos de Bingham,
Ostwald de Waale e Herschell-Buckley. O comportamento em meio salino desse sistema foi
estudado para uma solu??o de KCl 2,0%, em substitui??o ? ?gua destilada. Foi determinado o
comportamento das microemuls?es em rela??o ? temperatura atrav?s de curvas de escoamento
a temperaturas de 25 a 60?C com varia??es de 5?C. Ap?s an?lise dos resultados a
microemuls?o sem adi??o de pol?mero apresentou um ligeiro aumento em sua viscosidade,
mas o que n?o a descaracteriza como um fluido newtoniano. Os sistemas aditivados quando
analisados com concentra??o baixa de pol?mero ajustaram-se bem aos modelos aplicados,
com comportamento muito pr?ximo da microemuls?o. J? a concentra??o mais elevada de
pol?mero deu aos sistemas comportamento de fluido pl?stico. Os resultados da varia??o de
temperatura apontam para um aumento na viscosidade dos sistemas que pode estar
relacionado a mudan?as estruturais nas micelas formadas na pr?pria microemuls?o sem
adi??o de pol?mero
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17747 |
| Date | 07 January 2014 |
| Creators | Barros, Rosemiro Marinho |
| Contributors | CPF:07286937391, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null, Silva, Djalma Ribeiro da, CPF:13893734449, http://lattes.cnpq.br/2791074318745945, Melo, Klismeryane Costa de, CPF:03444622422, http://lattes.cnpq.br/4874791052449347, Leite, Ricardo Henrique de Lima, CPF:52264343400, http://lattes.cnpq.br/3801476460958779, Dantas, Tereza Neuma de Castro |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Qu?mica, UFRN, BR, F?sico-Qu?mica; Qu?mica |
| 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:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.002 seconds