Sulfonated polyimides polymerization

In the search for PEMs with lower alcohol permeability than Nafion and other perfuorinated membranes, without degradation of the proton conductivity, a number of new polymeric membranes were synthetized and characterized, such as sulfonated polyimides, poly(arylene ether)s, polysulfones, poly(vinyl alcohol), polystyrenes, and acid-doped polybenzimidazoles. A comprehensive discussion of the properties of these alternative membranes is given in Chap. 6, along with those of Nafion and Nafion composites. [Pg.22]

Sulfonated Polyimides by Direct Polymerization of a Sulfonated Monomer 191... [Pg.185]

Sulfonated Polyimides by Direct Polymerization of a Sulfonated Monomer As reported by Genies et al. [27] from a study on model compounds. [Pg.104]

MC MDI MEKP MF MMA MPEG MPF NBR NDI NR OPET OPP OSA PA PAEK PAI PAN PB PBAN PBI PBN PBS PBT PC PCD PCT PCTFE PE PEC PEG PEI PEK PEN PES PET PF PFA PI PIBI PMDI PMMA PMP PO PP PPA PPC PPO PPS PPSU Methyl cellulose Methylene diphenylene diisocyanate Methyl ethyl ketone peroxide Melamine formaldehyde Methyl methacrylate Polyethylene glycol monomethyl ether Melamine-phenol-formaldehyde Nitrile butyl rubber Naphthalene diisocyanate Natural rubber Oriented polyethylene terephthalate Oriented polypropylene Olefin-modified styrene-acrylonitrile Polyamide Poly(aryl ether-ketone) Poly(amide-imide) Polyacrylonitrile Polybutylene Poly(butadiene-acrylonitrile) Polybenzimidazole Polybutylene naphthalate Poly(butadiene-styrene) Poly(butylene terephthalate) Polycarbonate Polycarbodiimide Poly(cyclohexylene-dimethylene terephthalate) Polychlorotrifluoroethylene Polyethylene Chlorinated polyethylene Poly(ethylene glycol) Poly(ether-imide) Poly(ether-ketone) Polyethylene naphthalate Polyether sulfone Polyethylene terephthalate Phenol-formaldehyde copolymer Perfluoroalkoxy resin Polyimide Poly(isobutylene), Butyl rubber Polymeric methylene diphenylene diisocyanate Poly(methyl methacrylate) Poly(methylpentene) Polyolefins Polypropylene Polyphthalamide Chlorinated polypropylene Poly(phenylene oxide) Poly(phenylene sulfide) Poly(phenylene sulfone)... [Pg.959]

Polymeric materials for MF membranes cover a very wide range from relatively hydrophilic to very hydrophobic materials. Typical hydrophilic materials are polysulfone (PS), poly ether sulfone (PES), cellulose (CE) and cellulose acetate (CA), polyamide (PA), polyimide (PI), polyetherimide (PEI), and polycarbonate (PC). Typical hydrophobic materials are polyethylene (PE), polypropylene (PP), polytetra-fluoroethylene (PTFE, Teflon), and polyvinylidene fluoride (PYDF). [Pg.2330]

Ethylene has been separated from ethane by a silver nitrate solution passing countercurrent in a hollow fiber poly-sulfone.165 This separation has also been performed with the silver nitrate solution between two sheets of a polysilox-ane.166 A hydrated silver ion-exchanged Nafion film separated 1,5-hexadiene from 1-hexene with separation factors of 50-80.167 Polyethylene, graft-polymerized with acrylic acid, then converted to its silver salt, favored isobutylene over isobutane by a factor of 10. Olefins, such as ethylene, can be separated from paraffins by electroinduced facilitated transport using a Nafion membrane containing copper ions and platinum.168 A carbon molecular sieve made by pyrolysis of a polyimide, followed by enlargement of the pores with water at 400 C selected propylene over propane with an a-valve greater than 100 at 35°C.169... [Pg.188]

A suitable polymer material for preparation of carbon membranes should not cause pore holes or any defects after the carbonization. Up to now, various precursor materials such as polyimide, polyacrylonitrile (PAN), poly(phthalazinone ether sulfone ketone) and poly(phenylene oxide) have been used for the fabrication of carbon molecular sieve membranes. Likewise, aromatic polyimide and its derivatives have been extensively used as precursor for carbon membranes due to their rigid structure and high carbon yields. The membrane morphology of polyimide could be well maintained during the high temperature carbonization process. A commercially available and cheap polymeric material is cellulose acetate (CA, MW 100 000, DS = 2.45) this was also used as the precursor material for preparation of carbon membranes by He et al They reported that cellulose acetate can be easily dissolved in many solvents to form the dope solution for spinning the hollow fibers, and the hollow fiber carbon membranes prepared showed good separation performances. [Pg.165]

SPIs can be synthesized by either post-sulfonation of a polyimide or by direct polymerization of sulfonated monomers. While the first method is largely used for the suhbnation of aromatic polymers such as poly(aryl ether ether ketones) [41-44] or polysuhbnes [37], it is scarcely used to synthesize SPIs,... [Pg.189]

In addition to the more conventional membranes, such as those of poly-sulfone and silicone rubber, there has been an exponential growth in the R feD of other membrane materials, such as polyimides and polyaramides. Inorganic or carbon sieving materials can also separate many gases, although their fragility and cost have made them less attractive. Robeson has noted a trade-off between the permeability (productivity) and selectivity (efficiency) of typical polymeric membranes. To transcend this well-known upper-bound trade-off curve and maximize both membrane permeability and... [Pg.266]

The most commonly used polymeric materials for preparing NF membranes are CA, polyimide and PA other materials are polyvinyl alcohol (PVA), sulfonated PSU, and inorganic materials, such as some metal oxides. [Pg.22]