摘要：3-Chloro-2-hydroxy propyl methacrylate (CHPMA) was prepared using methacrylic acid and epichlorohydrin. The effect of catalyst and temperature on the rate of conversion was studied. Benzyl trimethyl ammonium chloride was found to be very effecitve as a catalyst. The chloromethyl moiety on the resultant polymer was utilized for synthesizing ion excahne resins. Polymers of CHPMA cross linked with DVB were prepared, which were ten reacted with various amines to give ion exchange resins. Effect of dioxolane as a swelling agent, along with its recovery was also studied. The ion exchange resins were characterized by their capacity, consistency in capacity, void volume and water regain.
摘要：Ordered reactive ladderlkie polyallylsilsesquioxane (hereafter referred to as Allyl-T) and polyvinylsilsesquioxane (hereafter Vi-T) were synthesized via stepwise coupling polymerization. During this reaction, coupling agent p-phenyl-enediamine (PDA) is supposed to act as a template which enables silane molecules to self-assemble through strong hydrogen-bonding interaction between Si-OH groups and N-H groups.
摘要：A polymeric mimic of chymotryspin is synthesized by grafting Co(II)-coordinated monomers-template assembly of N-methacryloy-L-serine, N-methacryloyl-L-aspartic acid, N-methacryloyl-L-histidine and thetemplate N-nicotinoyltyrosylbenzyl ester on corsslinked support poly(glycidylmethacrylate-co-ethylene glycol dimethacrylate). The polymeric mimic obtained after leaching out Co(II), temperate and ungrafted monomrs was found to be hydrolytically acive against substrate N-benzyloxycarbonyl-tyrosyl-para-nitrophenyl ester.
摘要：The poly(acrylaminophosphonic-carboxyl-hydrazide) chelating ion exchange fibre was prepared by the amination and phosphorization reaction of the hydrazine-modified polyacrylonitrile fibre. The structure fothe chelating fibre and the same fibre saturated by Cu(II) and Ag(I) ions was investigated by IR spectrometer in detail. In addition, the crystaline and surface characteristics of the chelating fibre were determined by X-ray diffraction and SEM. The higher binding capacities of the fibrous sorbent for Cu(II), Pb(II), Zn(II), Co(II), Hg(II), Cd(II), Mn(II), Cr(II) and Ag(I) and the effect of pH value on adsorption of the clelating fibre for Cu(II) and Hg(II) ions were examined.
摘要：Polypyrrole heparin compsite conducting polymers (PPy/heparin) have been electrochemically synthesised on a quartz crystal electrode. PPy/heparin is electro-active and shows cation exchange properties upon rduction/oxidation. The immobilised heparin can be determined using the toluidine blue assay. Electrochemical quartz crystal microbalance studies show that the heparin in the composite polymer is still active in binding thrombin. In contrast, PPy/heparin has no specific interaction with other test roteins such as BSA or HSA. The morphology of the PPy/heparin composite was investigated using atomic force microscopy.
摘要：A new mixed Schiff base N, N'-ethylenemono(3-carboxysaliclideneimine)mono(salicylideneimine) has been synthesized by the condensation of equimolar quantities of ethylenediamine, salicyladehyde and 3-formylsalicylic acid. A polymer supported Schiff base (PS-CH_2-LH_2) has been synthesized by the reasction of chloromethylated polystyrene (containing 3.9 mmol of chlorine per g of resin and 2/100 cross-linked with divinylbenzen) and the Schiff base N, N'-ethylenemono(3-carboxysalicylideneimine)mono(salicylideneimine).
摘要：Silica-supported hexaaldyguanidinium (SiGC1), tetraalkylammonium (SiNC1) tetraalkylphosphonium (SiPC1) chlorides were tested and compared for the obtention of choroalkanes from chloroformates through a S_N-2 pathway. The superiority of SiGC1 appears clearly from the collected data. Conversion times are largely dependent upon the morphology of the silica, but conditions quite close to those obtained with the hexabutylguanidinium chloride could be obtaiend; the decomposition of the 2-chlorooctyl choloroformate with SiGC1 is apart, since there is a competition between the thermal S_Ni and the catalytic S_N2 routes which could not be totally avoided.
摘要：The paper shows the splicability of IR spectroscopy to investgate the ionization of sorbates in the resin phase. Amino acids sorbed by sulphuric polystyrene-divinylbenzene cation-exchange resin were used as example. Charge changes in the resin phase accompanies sorption of amino acid ions. The average charge of the ions in the cation-exchanger pahse is more positive than in the surrounding colution. Only the sorption of the most postitively charged ions is not accomparnied with recharging.
摘要：The hydrolysis of comb-like polymers with polythiirane main chains and PEO side chains linked with monothioacetl function or ester function was studied in various conditions. The monothioacetal link exhibited a rather good stability except in very acidic conidtions. In a buffered medium, acidic as well as basic, the hydrolysis of the ester link was degenerated first order. In basic stoichiometric conditions the kinetics is second order and a ionic strength effect was evidenced. The energy of activation was also evaluated in these conditions.
摘要：The electrodilytic water dissociation process employing bipolar membranes has been used successfully for obtaining acids and alklies from salts. Earlier reports by us described the preparation of bipolar membranes and their applications in converting sodium sulphate into sulphuric acid and sodium hydroxide; sodium acetate into acid and soidium hydroxide [G.S. Trivedi et al., React. Funct. polym. 28 (1996) 243; Ibid: 32 (1997) 209]. In this paper as an extension of our earlier published works the experimental results on the conversion of sodium phosphate to phosphoric acid and soidum hydroxide under different expermental conditions are described.
摘要：Interpenetrating polymer networks (IPNs) were synthesized by irradiating acrylonitrile solutions of poly(N-vinyl-2-pyrrolidone) with ~(60)Co-γ rays. The conversion to insolube IPN structure was characterized using FT-IR abd thermal analysis methods. The amidoximation of polyacrylonitrile moieties of IPN was carried out in queous solutions of NH_2OH.HCI-NaOH at 50 deg C. The conversion of amidoximation was followed by using FT-IR spectrophotometer and conversion of nitrile groups to amidoxime was determined as percentage. The structure of amidoximated IPN was characterized by FT-IR and thermal methods as well.
摘要：A water-soluble polymer, carrying 0.16 mequ of lactose/g was prepared following the copolymerization of 2-nitro-4-(carboxyhydrazido-N-acryloy]benzyl 2,3,6,-tri-O-acteyl-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-β-D-glucopyrano-side and acrylamide. Subsequently, employing a sialytransferase-phosphatase system a NeuNAc-residue was transferred regio-and stereoselectively to the acceptor polymer, to yield, following photochemical release, the free G_(M3)-oligosaccharide NeuNAcα(2-3)Galβ(1-4)Glc].
摘要：Celluloses partially functionalized with chloroacetate groups were obtained by reaction of cellulose with chloroacetyl chloride using pyridine aa catalyst and the dimethylacetamide/LiCl system as solvent, ~(13)C NMR spectra at 75.4 MHz of partially modified celulose with chloroacetate groups were studed in order to evalute the selectivity of the raction of cellulose with chloroacetyl chloride inthe homogeneous phase. Analysis of the spectra of ring carbons in the anhydroglucose units shows that the reactivity of the individual hydroxyl groups decreases in the order C-6>C-3>C-2.
摘要：In aqueous alkaline media (e.g. water-borne metallic paints) aluminium pigments react by the evolution of hydrogen. This corrosion reaction can be inhibited by addition of different water-soluble polymers with carboxyl groups like polyacrylic acids, styrene-maleic acid or styrene-acrylate copolymers. As a rough empirical rule can be stated that the corrosion-inhibiting effect of polymers with carboxyl groups increases with decreasing molecular mass and decreasing acid number. Moreover, the isoelectric point (IEP) of aluminium oxide (pH≈9) seems to be an important factor controlling corrosion inhibition (and adsorption) of polymers with carboxyl groups.
摘要：Six new poly(styrene-p-hydroxamic acids) have been synthesised, characterised and their physico-chemical properties have been determined. These polymers are sued as chelating ion-exchange resins for the separation and determination of rare earths. The method is used for the determination of lanthanum, cerium, neodymium and yttrium in the synthetic, standard and environmental samples.
摘要：A process scheme for effecitively recovering uranium from dilute solutions, particularly from alkaline carbonate solutions, is developed. The uranyl quadrivalent complex anions [UO_2(CO_3)_3]~(4-) are made unstable at pH 6.5-8.5 so that they are partly converted into U_2O~(2-)_7 nions in resin pahse and mostly exist in the form of [UO_2(CO_3)_2]~(2-) in solution, exept for a certain amount of H_n[UO_2(CO_3)_3]~(n-4) (n=0-3). The conversion causes (1) greater than 2-fold of uranium loading capacity at pH 6.5-7.5 referred to that obtained from conventional ion-exchange mechanism, and (2) the minimum ratio between the moles of CO_2 relased from the reaction of hydrochloric acid with uranium loading resin and that of uranium loaded by the same amount of resin.
摘要：Pplymer-bound 2,2'-bipyridine-iron(II,III) complexes have been shown catalytically oxdize cyclic alkenes with atmospheric pressure of molecular oxygen or air in the absence of solvent at ～70 deg C. When cyclohexene are oxidized, the double bonds are maintained and 2-cyclohexen-1-ol as well as 2-cyclohexen-1-one is procuced with the selectivity to total alcohols and ketones in the range of 92.5-97.7/100. The catalytic activity and selectivity are influenced by the polymer supported ligands, monomeric ligands and additives. Complexes with mixed ligands or with coordinatively unsaturated structures exhibit higher catalytic activity compared with the reference complexes.
摘要：Amberlite XAD-4, the commecial form of poly(divinylbenzene-co-ethylvinylbenzene), was modified by bromohydration and bromination of its pendant vinylbenzene groups. The vinylbenzene groups were completely converted to (1,2,-dibromoethy)benzene groups, with a degree of functionalization of 35/100. Bromohydration of XAD-4 created a resin with (1-hydroxy-2-bromoethy)benzene groups, with a degree of functionalization of 24/100. Further modifications to the (1,2-dibromoethy)benzene groups of the brominated resin were done using throurea, which led to a resin with a mixture of functional groups, including isothiouronium bromide; and using N, N-dimethylthioformamide with subsequent methanolysis, which led to a resin with thiol groups.
摘要：The one-step reaction fo diethylenetriaminepentaacetic acid bisanhydride with polyvinyl alcohols of different molecular weights produces chelating resins containing aminocarboxylic acids as dunctionla groups. Metal sorption in different hydroxhloric acid concentrations media and desorption studies were carried out and the results compared according to the density of complexing groups. The resins show a great sorption affinity towards Au(III). The desorption of Au(III) from the resins carried out by applying perchloric aicd or thiourea as eluting agents led to the assumption that gold is strongly compexed indicating a particular mechanism of metal sorption.
摘要：Separation of close boiling point mixtures of alkylphenols, such as p-cresol/2,6-xylenol, m-cresol/2,6-xylenol and p-cresol/m-cresol has been attempted using commercially available ion-exchange resins. The basic resins selectively adsorb the cresol isomers from their mixtures wiht 2,6-xylenol. The separation seems to be decided by the thermodynamic selectivity in the ion-exchange resin framework with diffusional selectivity also contributing to the separation.