The discovery of polyurethane [PU] dates back to the year 1937 by Otto Bayer and his coworkers at the laboratories of I.G. Farben in Leverkusen, Germany. The initial works focussed on PU products obtained from aliphatic diisocyanate and diamine forming polyurea, till the interesting properties of PU obtained from an aliphatic diisocyanate and glycol, were realized. Polyisocyanates became commer...

SIR,-Following the recent report by Drs P J Toghill and R G Wilcox (28 February, p 502) we would like to recount a similar case in this hospital The patient was a 54-year-old housewife who developed aplastic anaemia of undetermined aetiology. As in the case reported, she had been using a new hair dye prior to this. This contained para-toluene diamine sulphate. She showed no response to predniso...

Many strong and extreme sensitizing chemicals, such as para-phenylenediamine (PPD), toluene-2,5-diamine (TDA) and other aromatic amines or cross-reacting substances, are ingredients in hair dye products. The chemistry of hair dyeing and the immunological reactions to the potent sensitizing hair dye components are complex and have not been fully clarified up until now. Recently 2-methoxymethyl-p...

The pressure swing distillation in different batch column configurations is investigated by rigorous simulation calculations. The calculations are made by a professional flow-sheet simulator for the separation of a minimum (ethanol–toluene) and a maximum boiling (water– ethylene-diamine) azeotropic mixture. Besides studying the well known configurations (rectifier, stripper) we also investigate...

Monoliths functionalized with ethylene diamine-derived ligands were synthetized within micro-sized channels as highly permeable catalytic supports for the immobilization of in-situ generated gold nanoparticles. The as-obtained hybrids, essentially differing on grafted amine-containing compared, notably regarding immobilized nanoparticles morphology and their dispersion at monolith pore surface....

Diamine bis(phenolate) ligand precursors 6,6'-(2-(dimethylamino)ethylazanediyl) bis(methylene)bis(2,4-di-tert-butylphenol) (H2L, 1) and (S)-6,6'-((1-ethylpyrrolidin-2-yl) methylazanediyl) bis(methylene)-bis(2,4-di-tert-butylphenol) (H2L, 2) were used to prepare titanium and vanadium complexes. The compounds, with formulas [VOL(OPr)] (3), [TiLCl(THF)] (4), [TiLCl]2(μ-O) (5), [TiL(OPr)2] (6) and ...

Utilization of multivariate data analysis in catalysis research has extraordinary importance. The aim the MIRA21 (MIskolc RAnking 21) model is to characterize heterogeneous catalysts with bias-free quantifiable from 15 different variables standardize catalyst characterization and provide an easy tool compare, rank, classify catalysts. present work introduces mathematically validates by identify...

Humans are exposed to toluene diisocyanate (TDI) primarily through inhalation in workplaces where TDI is produced or used. It is classified as a possible human carcinogen, based primarily on increased tumor incidences in rodents treated with TDI by oral gavage. We used the hypothesis-based weight-of-evidence (HBWoE) method to evaluate whether the available data support the hypothesis that TDI i...