Solvent‐ and catalysts‐free immobilization of tannic acid and polyvinylpyrrolidone onto PMMA surface by DBD plasma

Abstract

Polyvinylpyrrolidone (PVP) and tannic acid (TAN) macromolecules were attached to polymethyl methacrylate (PMMA) surface in a two-step approach in order to establish a tailored tissue-friendly surface layer. First PMMA surface was activated by an air diffuse coplanar surface barrier discharge plasma and subsequently coated with these macromolecules. PVP and TAN which has antibacterial effects are widely used in food and drug industry, however have never applied for polymer surface modification. Throughout characterization measurements confirm that during plasma treatment oxygen containing functional groups (-OH, -C=O, -COOH) incorporate in the surface. 1HNMR spectroscopy verified the strong H-bonds between PVP and TAN, which rendered the layer-by-layer as- Many researches have been carried out to overcome this shortcoming of polymers including PMMA.A common approach to make the surface more hydrophilic is to modify the surface chemistry. Due to the chemical inertness of the polymeric materials their surface modification means that first they shall undergo surface activation before subsequent covalent functionalisation (Fig.1.). It was found that a hydrophilic surface created by surface modification and formation of new functional groups on the surface by oxygen plasma treatment greatly inhibited bacterial adhesion to PMMA surface [8].The hydrophilic properties, however, usually does not last long due to the ageing effect of such treatment [9]. The speed of ageing is affected by several operating factors of the treatment, includ-

Aminomethylation of spruce tannins and their application as coagulants for water clarification

“…The C1s spectrum for the tannin samples presented in Fig. 4 clearly revealed two main peaks at 284.8 eV and at 286.5 eV, which can be assigned to C-C, C=C and C-H (C1 component) and C-OH and C-O (C2 component), respectively [29]. A minor peak was observed at ~288.0 eV with the spruce tannin 14 samples (Fig.…”

Effects of Tree Harvesting Time and Tannin Cold-/Hot-Water Extraction Procedures on the Performance of Spruce Tannin Biocoagulant for Water Treatment

“…3a, the C1s peaks can be fitted into three components centred at 284.8 eV, 286.5 eV and 288.1 eV assigned to C-C/C=C/C-H (C1), C-OH/C-O (C2) and C=O (C3) functional groups, respectively (Fig. S2) [30]. Furthermore, the overlaid C1s spectra for the summer samples displayed visible doublet peaks at 292.8 eV and 295.6 eV and were ascribed to K2p 3/2 and K2p 1/2 of potassium [31,32].…”

Chemical remediation of Aflatoxin B1 using encapsulated polyvinylpyrrolidone as an environmental-friendly control.

“…The percentage of unbounded TA (three water washes) in the formulation was determined by the Folin-Ciocalteu assay using spectrophotometric detection at 700 nm (Safire Tecan 2 plate reader). Folin-Ciocalteu assay was prepared according to Blainski et al [29].…”