Poly -grafted polysulfone

Water can be removed from methanol by a membrane of polyvinyl alcohol cross-linked with polyacrylic acid, with a separation factor of 465.204 A polymeric hydrazone of 2,6-pyridinedialdehyde has been used to dehydrate azeotropes of water with n- and /-propyl alcohol, s- and tort butyl alcohol, and tetrahydrofuran.205 The Clostridium acetobutylicum which is used to produce 1-butanol, is inhibited by it. Pervaporation through a poly(dimethyl-siloxane) membrane filled with cyclodextrins, zeolites, or oleyl alcohol kept the concentration in the broth lower than 1% and removed the inhibition.206 Acetic acid can be dehydrated with separation factors of 807 for poly(4-methyl-l-pentene) grafted with 4-vinylpyridine,207 150 for polyvinyl alcohol cross-linked with glutaraldehyde,208 more than 1300 for a doped polyaniline film (4.1 g/m2h),209 125 for a nylon-polyacrylic acid membrane (5400 g/m2h), and 72 for a polysulfone.210 Pyridine can be dehydrated with a membrane of a copolymer of acrylonitrile and 4-styrenesulfonic acid to give more than 99% pyridine.211 A hydrophobic silicone rubber membrane removes acetone selectively from water. A hydrophilic cross-linked polyvinyl alcohol membrane removes water selectively from acetone. Both are more selective than distillation.212... 

J.Y. Park, M.H. Acar, A. Akthakul, W. Kuhlman, A.M. Mayes, Polysulfone-graft-poly(ethylene glycol) graft copolymers for surface modification of polysulfone membranes. Biomaterials 27 (6) (2006) 856-865. 

In another grafting to procedure, four polymers [PVDF, polysulfone (PSF), poly(2,6-dimethylphenylene oxide) and poly(phthalazinone ether ketone)] were chemically bonded to MWNTs using ozone-mediated process. Compared with pristine MWCNTs and PSF-modified MWCNTs, PVDF-modified MWCNTs were more efficient as additives that enhance the mechanical strength and electrical conductivity of PVDF. ... 

Two types of poly electrolyte nanofiber mats were prepared in this study. One was polyacrylic acid (Mv = 450,000) fibers, spun from 5 wt% of aqueous solution. The other one was polysulfone fibers, spun from 25 wt% of DMF solution. The polysulfone fiber was then coated with a layer of polyelectrolyte, FAMPS, by a surface grafting technique (FAMFS-g-FS) similar to the procedure described previously. Nucrel membranes wereprepared by heat pressing Nucrel 535 (DuPont) pellets at 125°C. For fiber encapsulation, the fiber mats with measured weight and thickness were placed between two preweighed Nucrel membranes and then pressed at 125°C. The resulting composite membranes were flexible and robust with a homogeneous transparency. 

The chemical modification of homopolymers such as polyvinylchloride, polyethylene, poly(chloroalkylene sulfides), polysulfones,poly-chloromethylstyrene, polyisobutylene, polysodium acrylate, polyvinyl alcohol, polyvinyl chloroformate, sulfonated polystyrene block and graft copolymers such as poly(styrene-block-ethylene-co-butylene-block-styrene), poly(1,4-polybutadiene-block ethylene oxide), star chlorine-telechelic polyisobutylene, poly(lsobutylene-co-2,3-dimethy1-1,3-butadiene), poly(styrene-co-N-butylmethacrylate) cellulose, dex-tran and inulin, is described. 

Parvole J, Jannasch P (2008) Polysulfones grafted with poly(vinylphosphonic acid) for highly proton conducting fuel cell membranes in the hydrated and nominally dry state. Macromolecules 41 3893-3903... 

Lodge, T.P., Bang, J.A., Li, Z.B. et al. (2005) Strategies for controlling intra- and intermicellar packing in block copolymer solutions Illustrating the flexibility of the self-assembly toolbox. Faraday Discussions, 128,1-12. Lu, Z.H., Liu, G.J., and Duncan, S. (2004) Polysulfone-graft-poly(tert-butyl acrylate) Synthesis, nanophase separation, poly(tert-butyl acrylate) hydrolysis, and pH-dependent iridescence. Macromolecules, 37,174—180. 

Patel, R., Im, S.J., Ko, Y.T., Kim, J.H., Min, B.R. (2009) Preparation and characterization of proton conducting polysulfone grafted poly(styrene sulfonic acid) polyelectrolyte membranes. Journal of Industrial and Engineering Chemistry, 15, 299-303. 

---