| Téléchargement | - Voir le manuscrit accepté : Modified polysulfones 5: synthesis and characterization of tetramethyl polysulfones containing trimethylsilyl groups and their gas transport properties (PDF, 647 Kio)
|
|---|
| DOI | Trouver le DOI : https://doi.org/10.1016/S0032-3861(02)00411-1 |
|---|
| Auteur | Rechercher : Dai, Ying; Rechercher : Guiver, Michael D.1; Rechercher : Robertson, Gilles P.1; Rechercher : Bilodeau, Francois; Rechercher : Kang, Yong Soo; Rechercher : Lee, Kwi Jong; Rechercher : Jho, Jae Young; Rechercher : Won, Jongok |
|---|
| Affiliation | - Conseil national de recherches du Canada. Institut de technologie des procédés chimiques et de l'environnement du CNRC
|
|---|
| Format | Texte, Article |
|---|
| Sujet | Polysulfone modification; Trimethylsilyl; Gas transport |
|---|
| Résumé | Polysulfones with rigid backbone structures and silyl-containing substituents were prepared as membrane materials with potentially enhanced gas transport properties. Tetramethylbisphenol-A polysulfone (TMPSf) and tetramethylbiphenol polysulfone (TMPPSf) were made by polycondensation then post-modified to introduce trimethylsilyl (TMS) groups by bromination and lithiation methodology. Substitution of high levels of TMS groups at the ortho-sulfone sites was achieved using direct lithiation followed by addition of a trimethylsilane electrophile. In an approach to increase the overall TMS substitution level as well as introduce these groups on the bisphenol segment, both TMPSf and TMPPSf were cleanly brominated to a degree of substitution (DS) of 2.0 for bromine. While the subsequent lithium舑halogen exchange and reaction with TMS electrophile did not give high regioselectivity because of steric hindrance, the overall DS of TMS in the polymers was increased when excess n-butyllithium was used to activate both brominated and ortho-sulfone sites. The polymer structures were characterized by NMR spectroscopy. Their thermal properties as well as O2, N2, CO2 and CH4 gas transport properties were measured. Polymers with a high DS of TMS had very high CO2 and O2 permeabilities and good permselectivities from N2. The permselectivities of CO2/N2 were at or close to the Robeson upper-bound performance line |
|---|
| Date de publication | 2002 |
|---|
| Condition d’accès | |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Numéro du CNRC | NRCC 44382 |
|---|
| Numéro NPARC | 12339054 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 107eec96-3020-4459-9455-85bca244f41c |
|---|
| Enregistrement créé | 2009-09-11 |
|---|
| Enregistrement modifié | 2020-03-30 |
|---|
