Reactive Polymers最新文献

Acrylic polymer beads comprising a combination of 2-hydroxyethylmethacrylate (HEMA) with acrylic acid, dimethylaminoethylmethacrylate (DMAEMA), and methylmethacrylate were prepared by suspension copolymerization technique. In this study, we have examined the effects of polymer structural properties and medium conditions on the adsorption of plasma proteins, i.e. bovine serum albumin (BSA) and fibrinogen. The studies were carried out in dilute solutions and measurements of adsorbed proteins were realized by fluorescence spectroscopy. It was shown that the extent of protein adsorption depends upon the hydrophilicity and electrical charge of both of the polymeric surfaces and proteins. In addition, environmental conditions affect the adsorption behaviour by changing the structure of protein molecules. The maximum adsorption was observed on poly(HEMA-DMAE) beads for both of BSA and fibrinogen. For this polymeric structure multilayer BSA adsorption was observed in the range of 0.1–0.5 mg/ml solution concentration. For all surfaces, the adsorbed quantity of fibrinogen was greater than that of BSA.

A vinylpyridine/acrylic acid bifunctional interpenetrating polymer network (IPN) has been synthesized and evaluated for application in metal ion separations. Monofunctional vinylpyridine and acrylic acid IPNs were also synthesized and differences between the distribution coefficients of the three systems were used as an indication of whether an enhanced (i.e., synergistic) complexation of metal ions was occurring in the bifunctional polymer. Important effects attributable to the combined action of the two functionalities in the same polymer are observed. Complexation of Eu(III), a hard Lewis acid, by the bifunctional polymer is inhibited by hydrogen bonding between the two ligands. Borderline Lewis acids are complexed with high efficiency and evidence for a synergistic effect is presented.

A new bidentate ON donor Schiff base supported on a polystyrene matrix has been synthesized by the reaction of aminomethylated polystyrene and hydroxyacetone. The chelating resin reacts with metal salt/metal complex and forms metal-bound polymers. The formulae of the metal-bound polymers are: PSLCu(CH₃COO)·S, PSLNi (CH₃COO)·3S, PSLCo(CH₃COO)·S, PSLFeCl₂·2S, PSLZn (CH₃COO)·S, PSLZnCl·S, PSLMoO₂(acac), and PSLUO₂(CH₃COO)·S (where PSLH = polymer-anchored ligand; S = ethanol or methanol and acac = deprotonated acetylacetone). The polymer-anchored complexes have been characterized by elemental analysis, IR and electronic spectra and magnetic susceptibility measurements. The negative shifts of the ν(CO) (alcoholic) and ν(CN) (azomethine) are indicative of the ON donor behaviour of the polymer-anchored ligand. The complexes PSLNi(CH₃COO)·3S, PSLCo(CH₃COO)·S, PSLFeCl₂·2S, and PSLCu(CH₃COO)₂·S are paramagnetic while PSLZn(CH₃COO)·S, PSLZnCl·S, PSLMoO₂(acac), and PSLUO₂(CH₃COO)·S are diamagnetic. The force constant and UO bond distance of the polymer-anchored uranium(VI) complexes are 7.03 mdyn/Å and 1.73 Å, respectively. The copper(II)- and cobalt(II)-bound polymers exhibit a square planar structure, nickel(II), iron(III), molybdenum(VI) and uranium(VI) complexes are octahedral, and zinc(II) complexes are tetrahedral.

A series of β-cyclodextrin (β-CyD) was immobilized onto the crosslinked styrene/divinylbenzene copolymer which embedded polyglycidylmethacrylate. The resulting β-CyD polymeric adsorbent possesses a specific inclusion recognition with the aromatic compounds. The structures and properties of the grafted copolymer were characterized in detail. Their application for the adsorption of phenol and its derivatives was also assessed.

Carboxyl group containing hydrazine-modified polyacrylonitrile (PAN) fibre was prepared by a modified method of T. Miyamatsu and N. Oguchi. The first investigation of this modified ion exchange fibre (IEF) revealed that the maximum capacities of the modified PAN fibre for the heavy metal ions Cu²⁺, Cd²⁺, Zn²⁺, Co²⁺, Pb²⁺, Cr³⁺, Ni²⁺ and Hg²⁺ were 1.33, 1.30, 1.03, 1.02, 0.98, 0.96, 0.95 and 0.63 mmol/g (dry weight), respectively. According to the distribution coefficients the order of decreasing selectivity of the cation exchanger for the various metal ions was Cu²⁺ > Zn²⁺ > Cr³⁺ > Hg²⁺ > Cd²⁺ > Pb²⁺ > Ni²⁺ > Co²⁺. The product could be reused after regeneration with diluted nitric acid. The high exchange capacity for copper, which offers possibilities for the application of the material for industrial purposes, was examined in additional experiments.