7-O-Methyl-luteone was metabolized in a buffer solution by resting cells of Botrytis cinerea which is known as a fungus detoxifying prenylated isoflavones into further oxygenated meta­ bolites, and we could isolate an unstable epoxy-intermediate. The epoxy-intermediate was easily cyclized under acidic conditions to yield the corresponding isoflavone with a hydroxychroman part structure (= dihyd...

The article is concerned with hybrid amorphous polymers synthesized basing on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol that was cured by polyethylene polyamine and lithium perchlorate salt. Structural peculiarities of organic-inorganic polymer composites were studied by differential scanning calorimetry, wide-angle X-ray spectra, infrared spectroscopic, scanning electr...

Polymerization of β-phenyl glutaconic diethyl ester (GE) with various diamines (DA) at 1:2 molar ratios in 1,4dioxane solvent was carried out at reflux temperature. The resultant amino terminated unsaturated oligomers (ATUP) were characterized by elemental analysis, number of terminal amino groups, IR spectral studies, number average molecular weight estimated by non-aqueous conductometric titr...

Back Cover: In article number 2000466 by Sandra Schlögl and co-workers, the introduction of photolabile o-nitrobenzyl ester chromophores endows epoxy-anhydride vitrimers with spatially controlled solubility properties. Positive-tone microstructures are inscribed photolithography patterns thermally erased via catalyzed transesterifications.

Esterification of rosin with pentaerythritol produces ester (RPE) which is widely used in paint, coating, and pressure-sensitive hot-melt adhesive industries. Although RPE has excellent valuable applications been industrially produced, studies on the reaction kinetics have not reported present literature. This work proposed a kinetic study synthesis by including series consecutive reactions for...

Abstract In the paper, five quaternary ammonium salts derived from rosin were synthesized, characterized and their antifungal activities against different molds studied. Choline salt tetramethylammonium hydroxide synthesized dehydroabietic acid ethanolamine ester which are new compounds propylene pimaric acid. Their structures confirmed by FTIR, 1 HNMR, 13 CNMR, high resolution mass spectrometr...

Two series of rosin quaternary ammonium salts (QAS) were synthesized using the same path. The structure of the target products was characterized by HPLC, MS, IR, and 1 HNMR, and the bioactivity was determined by filter paper method using Trametes versicolor (white-rot fungus) and Gloeophyllum trabeum (brown-rot fungus), which are two kinds of general wood decay fungi in nature. The results show...

The effect of nanoclay on various material properties like damping and strength of typical thermoset polymers, such as epoxy and vinyl ester, was investigated. Different environmental conditions typical for high-voltage transmission pylons made of composite materials were taken into account. Resin samples were prepared with various clay weight fractions ranging from 0% to 3%. Scanning electron ...

sizing of paperboard has a distinctive position in packaging grade paperboard material. optimization of sizing by alum-rosin at neutral ph in 4 layered paperboard (330 g/m2) wereevaluated in this study to find the optimum ratio of alum- rosin loading in the process. fixed amount of 1% cationic dispersed rosin together with alum as a fixing agent at 5 different levels of 1, 1.5, 2, 3, and 4% (ba...