Highly Gas-Permeable Silanol-Functionalized Poly(diphenylacetylene)s: Synthesis, Characterization, and Gas Permeation Property

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• 作者：Toshikazu Sakaguchi ; Aiko Takeda ; Tamotsu Hashimoto
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：September 13, 2011
• 年：2011
• 卷：44
• 期：17
• 页码：6810-6817
• 全文大小：874K
• 年卷期：v.44,no.17(September 13, 2011)
• ISSN：1520-5835

文摘

Diphenylacetylenes having a diisopropylphenoxysilyl group [PhOSi(i-Pr)₂C₆H₄C鈮C₆H₄R; R = H (1a), SiMe₃ (1b)] were synthesized and then polymerized with TaCl₅/n-Bu₄Sn to provide the corresponding poly(diphenylacetylene)s (2a and 2b). These siloxy group-containing polymers afforded tough free-standing membranes by casting from toluene solutions. Treatment of the membranes (2a and 2b) with n-Bu₄N⁺F^{鈥?/sup> gave the silanol-functionalized poly(diphenylacetylene)s (3a and 3b). FT-IR spectra of the silanol-functionalized polymers revealed that some their silanol groups were consumed and the polymers were cross-linked via siloxane bond. The oxygen permeability coefficients of membranes of 2a and 2b were 12 and 26 barrers, respectively. The deprotection of these membranes in DMF lowered membrane densities, and consequently their gas permeability significantly increased. The oxygen permeability coefficients of silanol group-containing membranes (3a and 3b) were 210 and 1300 barrers, respectively. These silanol-functionalized poly(diphenylacetylene) membranes were found to exhibit very high gas permeability irrespective of the presence of the polar silanol groups in the polymers. Membrane of 3a showed relatively high CO₂ permselectivity as well as high CO₂ permeability.}