Neue Materialien zur Beseitigung von Ölverschmutzungen

Der Beitrag berichtet von der Entwicklung eines als Absorptionsmittel geeigneten Kompositmaterials auf der Basis von verschiedene Zellulosestrukturen aufweisenden Ausgangsstoffen und einem Bindemittel. Solche Absorptionsmittel sind einsetzbar für die Aufnahme von Mineralölprodukten aus wässrigen Phasen, beispielsweise aus belasteten Oberflächengewässern. Hierzu wurden geeignete biogene Ausgangsstoffe identifi ziert sowie ein Verfahren zur Herstellung von Sorptionsmitteln entwickelt und dessen prinzipielle Eignung demonstriert.In this paper we report on the development of composite materials applicable as absoption agent based on cellulose of special structures and a binder. Such agents may used for the take-up of mineral oils from aqueous phases like contaminated suface water. To this end, suitable raw materials and processing parameters were established to demonstrate the properties and performance of the products

Synthesis of a dipyrromethane functionalized monomer and optoelectrochromic properties of its polymer

A dipyrromethane functionalized monomer; 5-(4-tert-butylphenyl)dipyrromethane (BPDP) was synthesized. The structure of the monomer was characterized by nuclear magnetic resonance (1H NMR and 13C NMR) and Fourier transform infrared (FTIR) spectroscopies. Electrochemical polymerization of BPDP was performed in acetonitrile (AN)/LiClO4. The resulting conducting polymer was characterized by FTIR spectroscopy and electrical conductivity measurements. Spectroelectrochemical behavior and switching ability of P(BPDP) film were investigated by UV-Vis spectroscopy. P(BPDP) revealed color changes between yellow and blue in the reduced and oxidized states, respectively. In order to investigate electrochromic properties and stability of the P(BPDP) in electrochromic device (ECDs) application, dual type polymer ECD based on P(BPDP) and poly(ethylene dioxythiophene) (PEDOT) were constructed. Spectroelectrochemistry, switching ability and stability of the devices were investigated by UV-Vis spectroscopy and cyclic voltammetry

Complex Formation Between Lysozyme and Stabilized Micelles with a Mixed Poly(ethylene oxide)/Poly(acrylic acid) Shell

The electrostatic complexation between lysozyme and stabilized polymeric micelles (SPMs) with a poly­(acrylic acid) (PAA) or a mixed poly­(ethylene oxide)/poly­(acrylic acid) (PEO/PAA) shell (SPMs with a mixed shell, SPMMS) and a temperature-responsive poly­(propylene oxide) (PPO) core was investigated by means of dynamic, static, and electrophoretic light scattering. The SPMs and different types of SPMMS used resulted from the self-assembly of PAA–PPO–PAA triblock copolymer chains, or PAA–PPO–PAA and PEO–PPO–PEO triblock copolymer chain mixtures (with varying chain lengths and molar ratios) in aqueous solutions at pH 10 and the subsequent cross-linking of their PPO cores via loading and photo-cross-linking of pentaerythritol tetraacrylate (PETA). The solution behavior, structure and properties of the formed complexes at pH 7 and 0.01 M ionic strength, were studied as a function of the protein concentration in the solution (the concentration of the stabilized micelles was kept constant) or equivalently the ratio of the two components. The complexation process and properties of the complexes proved to be dependent on the protein concentration, while of particular interest was the effect of the structure of the shell of the SPMs on the stability/solubility of the complexes. Finally, the fluorescence and mid infrared spectroscopic investigation of the structure of the complexed protein showed that, although a small stretching of the protein molecules occurred in some cases, no protein denaturation takes place upon complexation