ISSN 2594-5327
51th Congresso anual — Vol. 52 , num. 1 (1997)
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Abstract
Rod-like polymers are intensively investigated as material for gas separation by permeation due to its enhanced free volume. In this work, poly(ether sulphone) was used to investigate further the influence of molecular architecture on gas permeation properties. The strategy is the introduction of NO₂ groups into the aromatic ring of the polymer backbone. This group can decrease packing density by replacing a hydrogen atom. On the other hand, the substitution reaction is carried out in very aggressive medium which may affect the polymer, leading to molecular weight reduction. The preliminary results showed an effective nitration of aromatic rings using nitric acid/sulfuric acid as observed by infrared spectrum. However, it was also noticed a reduction in inherent viscosity even at short reaction times. This reduction is associated with reduction in mechanical properties of the polymer avoiding film formation. These results were correlated with polymer degradation.
Rod-like polymers are intensively investigated as material for gas separation by permeation due to its enhanced free volume. In this work, poly(ether sulphone) was used to investigate further the influence of molecular architecture on gas permeation properties. The strategy is the introduction of NO₂ groups into the aromatic ring of the polymer backbone. This group can decrease packing density by replacing a hydrogen atom. On the other hand, the substitution reaction is carried out in very aggressive medium which may affect the polymer, leading to molecular weight reduction. The preliminary results showed an effective nitration of aromatic rings using nitric acid/sulfuric acid as observed by infrared spectrum. However, it was also noticed a reduction in inherent viscosity even at short reaction times. This reduction is associated with reduction in mechanical properties of the polymer avoiding film formation. These results were correlated with polymer degradation.
Keywords
Polymer modification, nitration, aromatic polymers, membranes, gas separation, infrared spectroscopy
Polymer modification, nitration, aromatic polymers, membranes, gas separation, infrared spectroscopy
How to cite
Pala, Danielle Marins; Andrade, Cristina Tristão de; Borges, Cristiano Piacsek; Sena, Maria Eugênia R. de.
Modificações Químicas em Polímeros Vítreos e seus Efeitos na Permeação de Gás,
p. 3229-3239.
In: 51th Congresso anual,
São Paulo, Brasil,
1997.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00206-3229-3239
