Well‐defined amphiphilic graft copolymer with hydrophobic polysulfone (PSU) backbone and hydrophilic poly(acrylic acid) (PAA) side chains were synthesized and characterized. For this purpose, commercially available PSU was converted to azido‐functionalized polymer (PSU‐N3) by successive chloromethylation and azidation processes. Independently, poly(tert‐butyl acrylate) (PtBA) with an alkyne‐end‐group is obtained by using suitable initiator in atom transfer radical polymerization (ATRP). Then, this polymer was successfully grafted onto PSU‐N3 by click chemistry to yield polysulfone‐graft‐poly(tert‐butyl acrylate), (PSU‐g‐PtBA). Finally, amphiphilic polysulfone‐graft‐poly(acrylic acid), (PSU‐g‐PAA), membranes were obtained by hydrolyzing precursor the PSU‐g‐PtBA membranes in trifluoroacetic acid. The final polymer and intermediates at various stages were characterized by 1H NMR, FTIR, GPC, and SEM analyses. Protein adsorption and eukaryotic and prokaryotic cell adhesion on PSU‐g‐PAA were studied and compared to those of PSU‐g‐PtBA and unmodified PSU. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

Functionalization of polysulfones by using “Click” chemistry is described for the example of a small fluorescent analyte propargylpyrene. First, PSUs were converted to azido‐functionalized polymers by successive chloromethylation and azidation. Propargylpyrene was prepared independently as a fluorescent click component. Finally, the azido‐functionalized PSUs were coupled with propargylpyrene with high efficiency by copper‐catalyzed azide/alkyne click reactions. The final polymers and intermediates at various stages were characterized by 1H NMR, FT‐IR, GPC, UV‐Vis, and fluorescence spectroscopy techniques. magnified image

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Preparation of new types of poly(amideimide)s with high thermal stability and improved solubility was investigated. Two new diimide-dicarboxylic acid containing pendent benzimidazole group, viz., 2-[3,5-bis(N-trimellitimidoyl)-phenyl] benzimidazole (DIDA-i) and 2-[3,5-bis(N-trimellitimidoyl)-phenyl] 5-methyl benzimidazole (DIDA-ii) from the condensation of 5-(2-benzimidazole)-1,3-phenylenediamine (DABI A ) and 5-(5-methyl-2-benzimidazole)-1,3-phenylenediamine (DABI B ) with trimellitic anhydride in glacial acetic acid were synthesized, respectively. 1,3-bis(N-trimellitimidoyl)benzene (DIDA-iii, as a reference) was also synthesized in a similar manner to study the properties of the its structure. Three series of aromatic poly(amide-imide)s were prepared by triphenyl phosphite-activated polycondensation from diimide-dicarboxylic acid DIDA-i, DIDA-ii, and the reference monomer DIDA-iii with various aromatic diamines. The polymers were obtained in quantitative yields with inherent viscosities between 0.46 and 0.81 dL g À1. The effects of the benzimidazole pendent groups on the polymer properties, such as solubility and thermal stability were investigated by comparison of the polymers. The polymers bearing benzimidazole pendent groups exhibited thermal stability and good solubility in common polar solvents higher than the reference polymers.

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Two new benzoxazole or benzothiazole-containing diimide-dicarboxylic acid monomers, such as 2-[3,5-bis(Ntrimellitimidoyl)phenyl]benzoxazole (2 o ) or 2-[3,5-bis(N-trimellitimidoyl)phenyl]benzothiazole (2 s ) were synthesized from the condensation reaction between 3,5-diaminobenzoic acid and 2-aminophenol or 2-aminothiophenol in polyphosphoric acid (PPA) with subsequent reaction of trimellitic anhydride in the presence of glacial acetic acid, respectively, and two new series of modified aromatic poly(amide-imide)s were prepared. This preparation was done with pendent benzoxazole or benzothiazole units from the newly synthesized diimide-dicarboxylic acid and various aromatic diamines by triphenyl phosphite-activated polycondensation. In addition, the corresponding unsubstituted poly(amide-imide)s were prepared under identical experimental conditions for comparative purposes. Characterization of polymers was accomplished by inherent viscosity measurements, FT-IR, UV-visible, 1 H-NMR spectroscopy and thermogravimetry. The polymers were obtained in quantitative yields with inherent viscosities between 0.39 and 0.81 dl g S1 . The solubilities of modified poly(amide-imide)s in common organic solvents as well as their thermal stability were enhanced compared to those of the corresponding unmodified poly(amide-imide)s. The glass transition temperature, 10% weight loss temperature, and char yields at 800-C were, respectively, 7-26-C, 17-46-C and 2-5% higher than those of the unmodified polymers.