• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
10.11606/D.59.2006.tde-17012007-092607
Document
Author
Full name
Jean Cláudio Balan
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2006
Supervisor
Committee
Okano, Laura Tiemi (President)
Bazito, Reinaldo Camino
Giongo, Carolina Vautier Teixeira
Title in Portuguese
Estudo da interação de derivados aquo-solúveis de celulose com tensoativos catiônicos
Keywords in Portuguese
1. Derivados de Celulose. 2. Tensoativo Catiônico. 3. Fluorescência.
Abstract in Portuguese
Resumo Em diversas formulações industriais, encontram-se, facilmente, vários exemplos da utilização de biopolímeros derivados de celulose em conjunto com tensoativos. Entretanto, na literatura, há divergências se ocorre realmente uma interação entre um polímero não iônico, como os derivados aquo-solúveis de celulose, em conjunto com tensoativos catiônicos. Desta forma, neste projeto de Mestrado, foram investigadas as interações entre três derivados de celulose (2-hidroxietil celulose, 2-HEC; hidroxipropil celulose, HPC e hidroximetilpropil celulose, HMPC) e três tensoativos catiônicos (cloreto de benzil-hexadecildimetilamônio, CBz; cloreto de fenil-hexadecildimetilamônio, Fenil e cloreto de 2-feniletil hexadecildimetilamônio, 2-Feniletil) obtendo-se informações sobre a estrutura dos agregados formados por este sistema através de medidas de condutividade, fluorescência no estado estacionário e viscosidade. Estas técnicas forneceram os parâmetros de concentração de agregação crítica (cac), concentração micelar crítica (cmc), grau de dissociação micelar e viscosidade das soluções. Em uma segunda etapa, foi investigada a variação da cmc do tensoativo zwitteriônico, coco amido propil betaína (CAPB), em soluções aquosas com diferentes pHs, visando futuros estudos de interação deste compostos com os biopolímeros derivados ou não de celulose.
Title in English
Study of the interaction between cellulose derivatives and the cationic surfactants
Keywords in English
1. Cellulose Derivatives . 2. Cationic Surfactants 3. Fluorescence.
Abstract in English
There are many industrial formulations that are consisted of a biopolymer, such as cellulose derivatives, and surfactants. However, in literature, there are some divergences if there is a cooperative interaction between non-ionic polymers, and cationic surfactants. For this reason, in this project, the interactions between three cellulose derivatives (2- hydroxyethyl cellulose, 2-HEC, hydroxypropyl cellulose, HPC, and hydroxymethylpropyl cellulose, HPMC), and cationic surfactants (benzyl hexadecyldimethylammonium chloride, CBz, phenylhexadecyldimethylammonium chloride, Fenil, and 2-phenylethyl hexadecyl dimethylammonium chloride, 2-Feniletil) were studied through conductivity, steady-state fluorescence and viscosity measurements. The critical aggregation concentration (cac), critical micelle concentration (cmc), micelle dissociation degree, and viscosity were determined for each polymer surfactant system. In addition, the cmc of a zwitterionic surfactant, coco amido propyl betaine (CAPB), was measured in aqueous solutions of different pHs. This last experiment was performed as a preliminary essay to study the interaction of zwitterionic surfactant with several types of biopolymers.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
dissertacao.pdf (1.07 Mbytes)
Publishing Date
2007-01-19
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
Centro de Informática de São Carlos
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2021. All rights reserved.