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Doctoral Thesis
DOI
https://doi.org/10.11606/T.46.2007.tde-29112007-160103
Document
Author
Full name
Janaina Aline Galvão Barros
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Catalani, Luiz Henrique (President)
Campana Filho, Sérgio Paulo
Neumann, Miguel Guillermo
Petri, Denise Freitas Siqueira
Quina, Frank Herbert
Title in Portuguese
Reticulação da poli (N-vinil-2-pirrolidona) e copolímeros por processos químicos
Keywords in Portuguese
Copolímeros
Hidrogel
Poli(N-vinil-2-pirrolidona)
Polímeros
Reação de Fenton
Reticulação
Abstract in Portuguese
Hidrogéis são materiais poliméricos com habilidade em intumescer em água e fluidos biológicos sem, contudo, se dissolver. Devido às suas propriedades de maciez e biocompatibilidade, estes materiais têm tido um crescimento enorme na área de engenharia de tecido, encapsulamento de células e liberação de drogas. Este trabalho visa a produção de hidrogéis de poli(N-vinil-2-pirrolidona) e seus copolímeros a partir de reticulações químicas. Como metodologia alternativa de produção de hidrogéis de poli(N-vinil-2-pirrolidona), foi estudada a reticulação do PVP por reação de Fenton, sendo que as concentrações dos reagentes foram avaliadas a fim de produzir um hidrogel com características semelhantes aos hidrogéis de PVP por radiação ionizante. O grande diferencial desta metodologia foi a rápida cinética de gelificação apresentada, creditanto um potencial de aplicação inédito. A partir de reticulações químicas mais brandas, foi estudada a produção de hidrogéis de copolímeros de N-vinil-2-pirrolidona e aldeídos com quitosana, e íons divalentes. Além de estudadas as propriedades relativas ao hidrogel tais como: conteúdo de gel, grau de intumescimento, cinética de reação, citotoxicidade, densidade de reticulação, massa molar média entre as ligações cruzadas e tamanho de poro.
Title in English
Poly (N-vinyl-2- pyrrolidone) and copolymers crosslinking by chemical process
Keywords in English
Copolymers
Crosslinking
Fenton reaction
Hydrogel
Poly(N-vinyl-2-pyrrolidone)
Polymers
Abstract in English
Hydrogels are polymeric materials that have the ability to absorb water and biological fluids in their three-dimensional polymeric matrix without dissolution. Due to their interesting properties, such as softness and biocompatibility, there is a growing interest in their application in tissue engineering, cell encapsulation and drug delivery system. This work aims at the study of hydrogels from poly(N-vinyl-2-pyrrolidone) and copolymers produced by chemical crosslinking methods. PVP crosslinking by Fenton reaction was studied as an alternative methodology to produce poly(N-vinyl-2-pyrrolidone) hydrogels. The reagents concentrations were evaluated, in order to produce a hydrogel with the same properties of the hydrogels prepared by high energy radiation. The advantage of this methodology is its fast jellification kinetic, warranting new potential unprecedented applications. From mild chemical crosslinking methods, the production of hydrogels from copolymers of N-vinyl-2-pyrrolidone and aldehydes with chitosan, and divalent ions was studied. Hydrogels properties as: gel content, swelling ratio, reaction kinetics, cytotoxicity, crosslinking density, molecular weight and pore size were investigated.
 
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Publishing Date
2007-12-05
 
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