4-Vinylphenylboronic acid polymers

Covalent interactions (Fig. 7) this approach involves the formation of an easily cleavable functionalised monomer-template complex [61, 18]. The first example of an imprinted polymer network was prepared by Wulff s group and used the reversible formation of an ester bond between a diol and 4-vinylphenylboronic acid [15]. The reaction rates to reach equilibrium between the ester and boronic acid are comparable to those obtained with... 

By removing water under a reduced pressure at 40 °C, the ester of 4-vinylphenylboronic acid (0.30 g, 2.0 mmol) and sialic acid (0.62 g, 2.0 mmol) were prepared in dry pyridine (200 mL). The product was directly used for the polymerization (the covalent conjugate did not have to be isolated, since its formation was almost quantitative). This ester, ethylene glycol dimethacrylate (5.6 g, 28.2 mmol) and ADVN were dissolved in DMF (3.2 mL), and the polymerization was initiated by irradiating with UV light at 4 °C. After 12 h, the polymer was ground, and treated with 1 1 mixture of 0.01 M hydrochloric acid and methanol. By this post-treatment, the boronic acid esters were hydrolyzed and the sialic acids were removed from the polymer [2],... 

To clarify the second topic, boronic acids with strongly enhanced reactivity were prepared [6]. It was found that by the introduction of e.g. an o-dimethyl-aminomethylene group, an enhancement resulted in the kinetics of the transesterification as well as of the esterification and hydrolysis by 6-8 orders of magnitude. Therefore in monomer (1) the 4-vinylphenylboronic acid moiety was replaced by that of (2) [7] and crosslinked polymers were prepared from this monomer as described above. After splitting off the template, these polymers were also investigated by liquid chromatography. However, there was only some enhancement in mass transfer [8]. Similarly, chromatographic results were somewhat improved by the addition of piperidine or ammonia to the mobile phase. 

Polymer (B) poly(7V-isopropylacrylamide-co-p-vinylphenylboronic acid) 2005CIM... 

In this study, we synthesized a new water-soluble phospholipid polymer containing a p-vinylphenylboronic acid unit, that is, poly[MPC-co- -BMA-co-/ -vinylphenylboronic acid (VPBA)](PMBV). Also, we reported the synthesis and characterization of the polymer, formation and properties of polymeric hydrogel with PVA, and behavior of fibroblast cells in the hydrogel. 

Several other polymers containing 3-aminophenylboronic acid and vinylphenylboronic acid groups have been evaluated as electrochemical saccharide sensors. 

Pt-M catalysts (M = Ru, Ni, Co, Sn and Au) based on polymer-MWNT nanocomposites were prepared using one-step y-irradiation. Two different types of functional polymers, poly(vinylphenylboronic acid) (PVPBAc) and polyvinylpyrrolidone (PVP), were used to prepare nanocomposites. The Pt-M catalysts obtained based on polymer-MWNT nanocomposites were then characterized by XRD, TEM and elemental analysis. The catalytic efficiency of the Pt-M catalysts based on polymer-MWNT nanocomposites was also examined for CO stripping and MeOH oxidation for use in a DMFC. The catalytic efficiency of the Pt-M catalyst based on polymer-MWNT nanocomposites for MeOH oxidation followed the order Pt-Sn > Pt-Co > Pt-Ru >Pt-Au>Pt-Ni catalysts. The CO adsorption capacity of the Pt-M catalyst based on polymer-MWNT nanocomposites for CO stripping decreased in the order Pt-Ru > Pt-Sn > Pt-Au > Pt-Co > Pt-Ni catalysts. 

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