Dai, Y Guiver, MD Robertson, GP Kang, YS Lee, KJ 2024-01-21T08:11:21Z 2024-01-21T08:11:21Z 2021-09-03 2003-09-09 0024-9297 https://pubs.kist.re.kr/handle/201004/138236 A series of modified polymers with 4-trimethylsilyl-alpha-hydroxylbenzyl (HBTMS) substituents were made as new materials for membrane gas separation. HBTMS was introduced onto polysulfone (PSf), tetramethylpolysulfone (TMPSf), and hexafluoropolysulfone (6FPSf) by forming lithiated polymer intermediates followed by treatment with an electrophile, p-trimethylsilylbenzaldehyde. The resulting side substituent contains the bulky trimethylsilyl (TMS) groups separated from the polymer chain by an aromatic ring. The polymer structures were characterized by NMR spectroscopy, and thermal properties were investigated by differential scanning calorimetry and thermogravimetry. The permeability coefficients of the resulting polymers PSf-HBTMS, TMPSf-HBTMS, and 6FPSf-HBTMS showed considerable increases over the unmodified polymers. TMPSf-HBTMS showed the greatest improvements in gas transport properties with large increases in both CO2 and O-2 permeabilities of similar to3-fold (72 and 18 Barrers, respectively) compared with TMPSf. In the case of the CO2/N-2 gas pair, there was an absence of the typical accompanying tradeoff shown by decreases in permselectivity with increasing permeability. Comparisons of this series of polymers containing the new HBTMS substituent were made with those having other TMS pendant groups. English AMER CHEMICAL SOC TRANSPORT PROPERTIES CHEMICAL-MODIFICATION TRIMETHYLSILYL GROUPS MEMBRANES SYMMETRY POLYMERS DESIGN Enhancement in the gas permeabilities of novel polysulfones with pendant 4-trimethylsilyl-a-hydroxylbenzyl substituents Article 10.1021/ma0346411 1 MACROMOLECULES, v.36, no.18, pp.6807 - 6816 MACROMOLECULES 36 18 6807 6816 scie scopus 000185224800018 2-s2.0-0141682990 Polymer Science Polymer Science Article TRANSPORT PROPERTIES CHEMICAL-MODIFICATION TRIMETHYLSILYL GROUPS MEMBRANES SYMMETRY POLYMERS DESIGN gas permeabilities