Poly trimethylsilyl-1-propyne membrane

Pinnau I, Casillas CG, Morisato A, and Freeman BD. Long-term permeation properties of poly(l-trimethylsilyl-propyne) membranes in hydrocarbon-vaport environment. J. Polym. Sci. PartB Polym. Phys. 1997 35 1483-1490. 

Another possible approach to indirectly characterize the membrane morphology is based on the investigation of the free volume within the matrix. Density measurements [119,120] and positron annihilation lifetime spectroscopy evaluation [47] are common methods. Typically, the comparison between the theoretical density or free volume (calculated by simple additivity rules) and the experimental one can reveal the presence of a good interfacial morphology or the presence of interface voids or clustering formation. Fig. 7.13 shows the influence of filler content on the morphology of poly(trimethylsilyl propyne) (PTMSP)/Ti02 NCMs in terms of the volumetric fraction of interface voids as calculated from a comparison of the expected and measured membrane density [119],... 

Figure 7.13 Void volume fraction as a function of the Ti02 content in a poly(trimethylsilyl propyne)/Ti02 composite membrane as calculated from a comparison of the theoretical and experimental density.

FEP Teflon FEP membrane PMSP Poly(1-trimethylsilyl-l-propyne) membrane Nz Enzyme immobilized Nylon filter... 

M. Langsam, M. Anand and E.J. Karwacki, Substituted Propyne Polymers I. Chemical Surface Modification of Poly [ 1 -(trimethylsilyl)propyne] for Gas Separation Membranes, Gas Sep. Purif. 2, 162 (1988). 

H. Nishide, H. Kawakami, S.Y. Sasame, K. Ishiwata and E. Tsuchida, Facilitated Transport of Molecular Oxygen in Cobaltporphyrin/Poly(l-trimethylsilyl-l-propyne) Membrane, J. Polym. Sci., Part A Polym. Chem. 30, 77 (1992). 

The Segmental Motion and Gas Permeability of Glassy Polymer Poly(l-trimethylsilyl-l-propyne) Membranes... 

Kocherlakota LS, Knorr DB Jr, Foster L, Ovemey RM. Enhanced gas transport properties and molecular mobilities in nano-constrained poly[l-(trimethylsilyl)-l-propyne] membranes. Polymer 2012, 53(12) 2394-2401. 

Fadeev AG, Meagher MM, Kelley SS, Volkov VV. 2000. Fouling of poly[-l-(trimethylsilyl)-l-propyne] membranes in pervaporative recovery of butanol from aqueous solutions and ABE fermentation broth. J. Membr. Sci. 173 133-144. 

Pinnau, 1., et al. (1997). Long-Term Permeation Properties of Poly (1-trimethylsilyl-1-propyne) Membranes in Hydrocarbon—Vapor Environment. Journal of Polymer Science Part B Polymer Physics, 35(10), 1483-1490. 

Pinnau, I. et al.. Long-term permeation properties of poly (1-trimethylsilyl-l-propyne) membranes in hydrocarbon—vapor environment 1997,35(10),... 

Sitter, K.D., Andersson, A., D Haen, J., Leysen, R., Mullens, S., Maurer, F.H.J., and Vankelecom, I.F.). (2008) Silica filled poly(4-methyl-2-pentyne) nanocomposite membranes similarities and differences with poly(1 -trimethylsilyl-1 -propyne)-silica systems./. Membr. Sd., 321 (2), 284-292. 

Glucose sensors II and HI were prepared from the semipermeable membrane of PMSP, poly(1-trimethylsilyl-l-propyne), which has 4 times the oxygen permeability compared with that of FEP membrane. The response properties of sensor H, using a PMSP membrane with 25 Um diameter pinhole, were almost similer to that of the sensor I, so that their calibration curves were not presented in this paper. 

In contrast, organophilic PV membranes are used for removal of (volatile) organic compounds from aqueous solutions. They are typically made of rubbery polymers (elastomers). Cross-linked silicone rubber (PDMS) is the state-of-the-art for the selective barrier [1, 43, 44]. Nevertheless, glassy polymers (e.g., substituted polyacetylene or poly(l-(trimethylsilyl)-l-propyne, PTMSP) were also observed to be preferentially permeable for organics from water. Polyether-polyamide block-copolymers, combining permeable hydrophilic and stabilizing hydrophobic domains within one material, are also successfully used as a selective barrier. 

Poly[l-(trimethylsilyl)-l-propyne] (PMSP) is a typical glassy polymer at room temperature that was first syndiesized by Masuda and Higashimura in the 1980 s (1). Recently, membranologists have studied their gas permeation properties. The PMSP membrane has the highest gas permeability of all polymeric membranes. Therefore, this polymer is expected to have potential utiliQ in industrial applications such as the separation of oxygen and nitrogen from air. 

Because the so-called ultrahigh free volume polymers aroused much interest during the last 10 years, they will be briefly described in this introductory chapter. The publication of the physical properties of poly(l-trimethylsilyl-l-propyne) (PTMSP) in 1983 [281] aroused much interest in the field of membrane research. Up to this time it had been believed that the rubbery poly(dimethyl si-loxane) has by far the highest gas permeability of aU known polymers. Very surprisingly, the glassy PTMSP showed gas permeabilities more than 10 times higher than PDMS. This could be attributed to its very high excess-free volume and the interconnectivity of the free volume elements. Since then a number of... 

R. Srinivasan, S.R. Auvil, and P.M. Burban, Elucidating the mechanism(s) of gas transport in poly[l-(trimethylsilyl)-1-propyne] (PTMSP) membranes. J. of Membrane Science, 86 (1994) 67-86. 

The preferential affinity to EtOH depends on the balance between the hydro-philicity and the hydrophobicity of the membrane s material (Huang 1991). Qiu and Peinemann (2006) developed novel organic nanocomposite membrane for PV. The basic polymers were PDMS and poly(l-trimethylsilyl-l-propyne) (PTMSP). By implanting the hydrophobic organic molecules in PTMSP and PDMS, permselectivity to EtOH was enhanced. For example, PDMS with 20 wt% a-cyclodextrins provides a separation factor of 12 for EtOH (5 wt%)-water (95 wt%). Similarly, PTMSP with only 8 wt% a-cyclodextrins improved the enrichment of the low concentration of EtOH from 5 to 48 wt% and maintained the flux at 9 kg pm/m h. They claimed that the increased performance in EtOH-water separation with this organic nanocomposite membrane may lead to the practical industrial application by means of the PV process to produce bioethanol. 

For the first time, siUca-filled poly(l-trimethylsilyl-l-propyne) (PTMSP) layers on top of UF membranes for the pervaporative separation of EtOH-water mixtures was reported by Claes et al. (2010). Reduction of the thickness of the separating PTMSP top layer and addition of hydrophobic silica particles resulted in a clear flux increase as compared with dense PTMSP membranes. The performances of the supported PTMSP-silica nanohybrid membranes were significantly better than the best conunercially available organophilic PV membranes. The developed composite PTMSP-silica nanohybrid membranes exhibited EtOH-water separation factors around 12 and fluxes up to 3.5 kg/m h, establishing a sevenfold to ninefold flux inCTcase as compared with dense PTMSP membranes. 

M. Woo, J. Choi, M. Tsapatsis, Poly(l-trimethylsilyl-l-propyne)/MFl composite membranes for butane separations, Micropor. Mesopor. Mater., 110, 330-338 (2(X)8). 

S. Matteucci, V.A. Kusuma, D. Sanders, S. Swinnea, B.D. Ereeman, Gas transport in Ti02 nanoparticle-fiUed poly(l-trimethylsilyl-l-propyne). Journal of Membrane Science 307 (2008) 196-217. 

De Sitter K, Winberg P, D Haen J, Dotremont C, Leysen R, Martens JA, Mullens S, Maurer FHJ, Vankelecom IFJ (2006) Silica filled poly(l-trimethylsilyl-l-propyne) nanocomposite membranes relation between the transport of gases and structural characteristics. J Membr Sci278(l-2) 83-91... 

Gomes D, Nunes SP, Peinemann K-V (2005) Membranes for gas separation based on poly (l-trimethylsilyl-l-propyne)-silica nanocomposites. J Membr Sci 246(l) 13-25... 

---