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Previous issue date: 2015-02-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Os materiais t?xteis inteligentes e funcionais t?m sido amplamente
desenvolvidos e pesquisados com a finalidade de serem utilizados em v?rias
?reas da ci?ncia e tecnologia. Esses materiais fibrosos necessitam de diferentes
propriedades qu?micas e f?sicas para se tornarem materiais multifuncionais. Com
o advento da nanotecnologia, as t?cnicas desenvolvidas t?m sido ferramentas
essenciais para caracterizar qualitativamente esses novos materiais.
Ultimamente a aplica??o de micro e nanomateriais em substratos t?xteis tem
sido objeto de muitas pesquisas. Muitos desses nanomateriais n?o tem sido
otimizado, e os custos para sua aplica??o e a polui??o ao meio ambiente vem
aumentando, pois ainda n?o existe tratamento de efluentes contento esses
nanomateriais. As fibras de soja t?m baixa adsor??o de micro e nanoc?psulas
termosenss?veis devido a sua incompatibilidade de suas cargas superficiais. No
presente trabalho utilizou-se a s?ntese da quitosana para previamente
funcionalizar as fibras de soja. A quitosana ? um polieletr?lito natural
apresentando alta densidade de cargas positivas, as fibras de soja apresentam
cargas negativas bem como, as micro/nanoc?psulas, com isso a quitosana atua
como agente cationizador da fibra. Neste caso a quitosana atua como agente
auxiliar cationizador para fixar as microc?psulas termosenss?veis no substrato
t?xtil. Para a caracteriza??o do polieletr?lito foram feitas as an?lises do tamanho
das part?culas, potencial zeta, bem como as an?lises morfol?gicas (MEV e DRX),
an?lises das propriedades t?rmicas (TG), an?lise da Calorimetria Explorat?ria
Diferencial (DSC), an?lise por Espectroscopia na Regi?o do Infravermelho com
Transformada de Fourier (FTIR), colorimetria via espectro de UV-VIS foram
simultaneamente realizadas no substrato utilizado. No potencial zeta e na
determina??o do tamanho das part?culas foi observada a estabilidade
eletrost?tica da quitosana em torno de 31.55mV e 291,0 nm respectivamente. O
resultado obtido com (GD) para o material extra?do de camar?o foi de 70%, que
de acordo com a literatura pode ser considerada como quitosana. Para
otimiza??o do processo de tingimento foi usado um software estat?stico, o Design
expert. A funcionaliza??o do substrato t?xtil com 2% de quitosana apresentou o
melhor resultado de K/S, sendo o par?metro utilizado para o planejamento
experimental juntamente com as vari?veis, tendo demonstrado a melhor
resposta de tingimento na faixa de 2,624 de absorb?ncia. Verificou-se tamb?m
que a malha de soja tingida com as nano/microc?psulas termosenss?veis
apresentou excelente propriedade de solidez a lavagem, que foi observada ap?s
25 lavagens caseiras e valores significativos de K/S. / Intelligent and functional Textile Materials have been widely developed and
researched with the purpose of being used in several areas of science and
technology. These fibrous materials require different chemical and physical
properties to obtain a multifunctional material. With the advent of
nanotechnology, the techniques developed, being used as essential tools to
characterize these new materials qualitatively. Lately the application of micro and
nanomaterials in textile substrates has been the objective of many studies, but
many of these nanomaterials have not been optimized for their application, which
has resulted in increased costs and environmental pollution, because there is still
no satisfactory effluent treatment available for these nanomaterials. Soybean
fiber has low adsorption for thermosensitive micro and nanocapsules due to their
incompatibility of their surface charges. For this reason, in this work initially
chitosan was synthesized to functionalise soybean fibres. Chitosan is a natural
polyelectrolyte with a high density of positive charges, these fibres have negative
charges as well as the micro/nanoc?psules, for this reason the chitosan acts as
auxiliary agent to cationize in order to fix the thermosensitive microcapsules in
the textile substrate. Polyelectrolyte was characterized using particle size
analyses and the measurement of zeta potential. For the morphological analysis
scanning Electron Microscopy (SEM) and x-Ray Diffraction (XRD) and to study
the thermal properties, thermogravimetric analysis (TGA), Differential Scanning
Calorimetry (DSC), Near Infrared Spectroscopy analysis in the Region of the
Fourier Transform Infrared (FTIR), colourimetry using UV-VIS spectrum were
simultaneously performed on the substrate. From the measurement of zeta
potential and in the determination of the particle size, stability of electrostatic
chitosan was observed around 31.55mV and 291.0 nm respectively. The result
obtained with (GD) for chitosan extracted from shrimp was 70 %, which according
to the literature survey can be considered as chitosan. To optimize the dyeing
process a statistical software, Design expert was used. The surface
functionalisation of textile substrate with 2% chitosan showed the best result of
K/S, being the parameter used for the experimental design, in which this showed
the best response of dyeing absorbance in the range of 2.624. It was noted that
soy knitting dyed with the thermosensitive micro andnanocapsules property
showed excellent washing solidity, which was observed after 25 home washes,
and significant K/S values.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20020 |
| Date | 20 February 2015 |
| Creators | S?, Christiane Siqueira de Azevedo |
| Contributors | 18222161415, http://lattes.cnpq.br/8553209522282182, N?brega, Andreza Kelly Costa, 02293726436, http://lattes.cnpq.br/9418395015529669, Oliveira, Fernando Ribeiro, 03986506675, http://lattes.cnpq.br/8756490682656905, Nascimento, Jos? Heriberto Oliveira do, 02452573493, http://lattes.cnpq.br/7033735079037677, Ladchumananandasivam, Rasiah |
| Publisher | Universidade Federal do Rio Grande do Norte, P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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