Pervaporation of ethanol/water and benzene/cyclohexane mixtures using novel substituted polyacetylene membranes

Sakaguchi, Toshikazu; Yumoto, Kenichi; Kwak, Giseop; Yoshikawa, Masakazu; Masuda, Toshio

doi:10.1007/s00289-002-0041-z

Cited by 16 publications

(11 citation statements)

References 2 publications

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“…The pervaporation experiments of ethanol/water mixture were performed using polymer membranes 2a-g and 3a-e, whose results are shown in Table 6. The separation factor R EtOH/H2O of membrane 2a was 6.60, which is similar to that of poly[1--naphthyl-2-(ptrimethylsilyl)phenylacetylene] 18 (R EtOH/H2O ) 5.30). Although this value is smaller than those of poly(TMSP) 19 and poly(dimethylsiloxane) 20 (17.0 and 8.65, respectively), it indicates ethanol permselectivity.…”

Section: Resultsmentioning

confidence: 68%

Synthesis of Poly(diphenylacetylene) Membranes by Desilylation of Various Precursor Polymers and Their Properties

et al. 2005

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Diphenylacetylenes having various silyl groups (PhC≡CC6H4-SiR 1 R 2 R 3 , SiR 1 R 2 R 3 ) p- SiMe3, respectively) were polymerized with TaCl5-n-Bu4Sn catalyst to provide high molecular weight polymers. The formed polymers (2a-g) afforded tough free-standing membranes by casting from toluene solution. Desilylation of these Si-containing polymer membranes was carried out with trifluoroacetic acid. Para-substituted polymers (2a-e) underwent desilylation completely, while meta-subustituted polymers (2f and 2g) did not. According to thermogravimetric analysis (TGA), both Si-containing and desilylated polymers exhibited high thermal stability, and all the desilylated polymers showed practically the same onset temperature (∼480°C) of weight loss. The membranes of Si-containing polymers showed lower oxygen permeability as the silyl group became bulkier. The oxygen permeability coefficients (P(O 2) 120-3300 barrers) of desilylated polymer membranes were quite different from each other irrespective of the same polymer structure. When bulkier silyl groups were removed, the oxygen permeability increased to larger extents. In ethanol/water pervaporation, both Si-containing and desilylated polymer membranes showed ethanol permselectivity, indicating that these membranes possess large excess free volumes.

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Section: Resultsmentioning

confidence: 68%

Synthesis of Poly(diphenylacetylene) Membranes by Desilylation of Various Precursor Polymers and Their Properties

et al. 2005

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“…Desilylation of the polymer enhances the oxygen permeability of the membrane by a factor of 4, with the value increasing from 1550 to 6000 barrers. Furthermore, polytolan membranes can be applied to the separation of organic mixtures, given the insolubility of the membrane itself [15].…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polytolan membranes bearing p-hydroxyl groups

Shida

Sakaguchi

Shiotsuki

et al. 2005

Polymer

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“…7 Furthermore, being insoluble, this membrane can be used for the separation of organic mixtures as well as gas separation. 8 Ta and Nb catalysts are effective for the polymerization of disubstituted acetylenes. They, however, become inactive upon addition of protic compounds such as alcohols and carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Poly(diphenylacetylenes) Having Hydroxyl Groups

et al. 2005

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Polymerization of several diphenylacetylene derivatives was carried out by using TaCl5-n-Bu4Sn as catalyst. C6H5C≡CC6H4-p-OSi(CH3)2t-Bu (3a) and C6H5C≡CC6H4-m-OSi(CH3)2t-Bu (3b) provided the corresponding polymers (poly(3a), poly(3b)) with high molecular weights in good yields,Desilylation of poly(3a) and poly(3b) membranes catalyzed by trifluoroacetic acid yielded poly(diphenylacetylenes) having free hydroxyl groups [poly(4a), poly(4b)], which are the first examples of highly polar group-carrying poly(diphenylacetylenes). Poly(3a) and poly(3b) dissolved in nonpolar solvents such as toluene and chloroform, while poly(4a) and poly(4b) were insoluble in these solvents. According to TGA in air, poly-(3a) and poly(3b) were thermally fairly stable among substituted polyacetylenes, and poly(4a) and poly-(4b) displayed even higher thermal stability. The P CO2/PCH4 and PCO 2 /PN 2 permselectivity ratios of poly(4a) and poly(4b) membranes were as large as 13-46, while keeping relatively high PCO 2 values.

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Pervaporation of ethanol/water and benzene/cyclohexane mixtures using novel substituted polyacetylene membranes

Cited by 16 publications

References 2 publications

Synthesis of Poly(diphenylacetylene) Membranes by Desilylation of Various Precursor Polymers and Their Properties

Synthesis of Poly(diphenylacetylene) Membranes by Desilylation of Various Precursor Polymers and Their Properties

Preparation and properties of polytolan membranes bearing p-hydroxyl groups

Synthesis and Properties of Poly(diphenylacetylenes) Having Hydroxyl Groups

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