Polyphosphazenes membranes

Tang, H., Pintauro, P. N., Guo, Q. and O Connor, S. 1999. Polyphosphazene membranes. ni. Solid-state characterization and properties of sulfonated poly[bis(3-methylphenoxy)phosphazene]. Journal of Applied Polymer Science 71 387-399. 

Developmental carbon and zeolite membrar ies Inorganic membranes produced by anodic oxidation Polyphosphazene membranes... 

Allcock et al. also have investigated the use of phosphonated polyphosphazenes as potential membrane materials for use in direct methanol fuel cells (Figure A2) Membranes were found to have lEC values between 1.17 and 1.43 mequiv/g and proton conductivities between 10 and 10 S/cm. Methanol diffusion coefficients for these membranes were found to be at least 12 times lower than that for Nafion 117 and 6 times lower than that for a cross-linked sulfonated polyphosphazene membrane. 

Passi, P., Zadro, A., Marsilio, E, Lora, S., Caliceti, P., and Veronese, F.M. (2000). Plain and drug loaded polyphosphazene membranes and microspheres in the treatment of rabbit bone defects. J. Materials Science-Materials Med., 11, 643-654. 

A number of liquid crystalline polyphosphazenes with mesogenic side groups have been prepared (48—50). Polymers with nonlinear optical activity have also been reported (51). Polyphosphazene membranes have been examined for gas, liquid, and metal ion separation, and for filtration (52—54). There is interest in phosphazene—organic copolymers, blends, and interpenetrating polymer networks (IPNs) (55—61) to take advantage of some of the special characteristics of phosphazenes such as flame retardance and low temperature flexibility. A large number of organic polymers with cydophosphazene substituents have been made (62). 

Veronese, F. M., Marsillo, F., et al. Polyphosphazene membranes and microspheres in periodontal diseases and implant surgery. Biomaterials 20(l) 91-98, 1999. 

Gaeta, S.N., H. Zhang and E. Drioli, 1989, Preparation of polyphosphazene membranes for gas and liquid separations, in Proc. 1st InL Conf. Inorg. Membr., Montpellier, France, p.65. 

Effect of temperature on permeability of hydrogen sulfide in a 10% H2S/CH4 gaseous mixture through various polyphosphazene membranes... 

Organic/aqueous separations Liquid crystalline polyphosphazene membrane Good separation capabilities reported Review (Chinese) [107]... 

Duncan, J.B. and Nelson, D.A., The separation of tritiated water using supported polyphosphazene membranes, J. Membr. Sci., 157, 211, 1999. 

H. Tang, P.N. Pintauro, Q. Guo and S. O Connor, Polyphosphazene membranes. III. Solid-state characterization and properties of sulfonated poly[bis(methylphenoxy)-phosphazene], J. Appl. Polym. Sci., 1999, 71, 389-399. 

Nelson, D.A., Duncan, J.B., Jensen, G.A. and Burton, S.D. 1996. Isotopomeric water separations with supported polyphosphazene membranes. 112 105-113. 

Houston, K.S., Weinkauf, D.H. and Steward, F.F. 2002. Gas transport characteristic of plasma treated poly(dimethylsiloxane) and polyphosphazene membrane materials. 

Zhou, X. Weston, 1. Chalkova, E. Hofmann, M.A. Ambler, C.M. Allock, H.R. and Lvov, S.N. 2003. High temperature transport properties of polyphosphazene membranes for direct methanol fuel cells. 48 2173-2180. 

Separation of Tritiated Water. Aromatic polyphosphazene membranes were investigated in the separation of tritiated water from normal water, because of their excellent radiological, thermal, and chemical stabihty (170,171). For these experiments carboxylated poly(diaryloxy)phospohazenes were used. A tritium depletion as high as 33% was reported. 

Anchisini R, Faglia G, GaUazzi MC, Sbervegheri G, Zerbi G (1996) Polyphosphazene membrane as a very sensitive resistive and capacitive humidity sensor. Sens Actuators B 35(36) 99-102 Ando M, Kobayashi T, Haruta M (1996) Humidity-sensitive optical absorption of CO3O, film. Sens Actuators B 32 157-160... 

R. Wycisk and P. N. Pintauro, Polyphosphazene Membranes for Fuel Cells, in Fuel Cells II, Advances in Polymer Science, G. Scherer (Ed.), Springer-Verlag Berlin, Berlin, vol. 216, p. 157. 

Pintauro PN, Wycisk R (2004) Sulfonated polyphosphazene membranes for direct methanol fuel cells . Phosphazenes 591. 

P. Pintauro, H. Yoo, R. Wycisk, J. Lee and R. Carter, Direct methanol fuel ceU performance with multilayered polyphosphazene membranes, AIChE, Spring National Meeting, New Orleans, Los Angeles, USA, March 10-14 (2002). 

Studies of methanol permeation through proton-conducting polyphosphazene membranes show that polyphosphazene-based proton-exchange membranes have low methanol permeability and good proton conductivity [15], These membranes have been tested in the DMFCs and have shown good performance. 

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