Sulfonation Of Polymers
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Adding value to polystyrene waste by chemically transforming it into sulfonated polystyrene
ABSTRACT Polystyrene (PS), one of the most used polymers in everyday life, has a low recycling rate due to its inexpensive virgin resin. In order to make polystyrene waste (WPS) recycling advantageous, it is possible to change it chemically, introducing heteroatoms in the polymer chain thus transforming the waste into a material with more added value. In thi
Matéria (Rio J.). Publicado em: 16/09/2019
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2. Synthesis and characterization of sulfonated poly(ether imide) with higher thermal stability and effect on CO2, N2, and O2 permeabilities
An experimental design in different reaction conditions was applied to modify poly(ether imide), PEI, by sulfonation using acetyl sulfate. Higher temperatures and reaction times led to higher ion exchange capacity. The thermal analysis showed that our sulfonation approach accomplished preparing sulfonated PEI maintaining the thermal stability of its parent m
Mat. Res.. Publicado em: 18/02/2014
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3. Sulfonation and characterization of styrene-indene copolymers for the development of proton conducting polymer membranes
The aim of this work is to obtain polymer precursors based on styrene copolymers with distinct degrees of sulfonation, as an alternative material for fuel cell membranes. Acetyl sulfate was used to carry out the sulfonation and the performance of the polyelectrolyte was evaluated based on the content of acid polar groups incorporated into the macromolecular
Polímeros. Publicado em: 30/10/2012
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4. Desenvolvimento de membranas mistas a base de poli(indeno) sulfonado e PVA reticulado com objetivo de aplicação em célula a combustível tipo PEM
The study on alternative membranes for use in fuel cells PEM (Proton Exchange Membrane) has been conducted by different research groups worldwide. As the commercial membranes still have high cost and performance limitations in certain operating conditions of fuel cells powered by hydrogen and alcohol. This study aimed to evaluate non-fluorinated membranes pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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5. Desenvolvimento de membranas de poli(éter imida) sultonada para a permeacão de gases / Development of sulfonated poly(ether imide) membranes for gas permeation
A busca por membranas com propriedades adequadas a separação de gases em escala industrial tem levado a modificação e sIntese de polImeros de engenharia, com objetivo de obter membranas com propriedades adequadas. Uma das modificaçoes que tem se apresentado promissora é a inserção de grupos sulfônicos em polImeros comerciais. Espera-se que o polImer
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/12/2009
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6. Neutralization of Endotoxin Toxicity in Chick Embryos by Antibiotics1
Rifkind, David (University of Colorado Medical Center, Denver), and John D. Palmer. Neutralization of endotoxin toxicity in chick embryos by antibiotics. J. Bacteriol. 92:815–819. 1966.—Three cationic cyclic polypeptide antibiotics, polymyxin B sulfate colistin sulfate, and tyrocidine hydrochloride, were shown to neutralize endotoxin lethality in chick e