Search results

In this study, two novel fluorescent dyes, based on naphthalimide derivatives have been synthesised from acenaphthene as a starting material. The ability of the dyes to graft to polymer chain was then demonstrated. The novel synthesised dyes and self-coloured polymers were characterised by a variety of techniques.

The novel dyes were prepared through by halogenation, oxidation, imidation and amination reactions. All steps of these processes were monitored by thin layer chromatography. The fluorescent dyes and their intermediates were characterised by differential scanning calorimeter, fourier transform infrared spectroscopy (FTIR), Proton Nuclear Magnetic Resonance (1H-NMR) and carbon-13 nuclear magnetic resonance (13-CNMR) spectroscopic techniques. The molar extinction coefficients and absorption maximum wavelength were obtained by examining the dyes and polymer solutions in Dimethylformamide (DMF) and toluene solvents. The fluorescency of novel dyes and self-coloured polymers was evaluated. Their quantum yields and Stokes shift values were determined as DMF and toluene solutions. The percentage of the covalently bounded dyes into the polymer chain was calculated.

The characterisation of the synthesised dyes and self-coloured polymers verified their structural correctness. The results of reaction dyes with resin demonstrated that the dyes were covalently bonded to the chain of an acrylic polymer (resin) containing carboxylic acid groups giving self-coloured polymers. The extent of fluorescence of the synthesised dyes and their polymers showed that compounds containing functional amino group in C-4 position of naphthalimide ring have high fluorescence properties.

This study is original. Self-coloured polymers based on acrylic were synthesised by novel naphthalimide dyes with acrylic resin for the first time, successfully. The novel dyes and their self-coloured polymers exhibit good and acceptable fluorescent activity.

In this work, A new 4–(2-aminoethylene) amino-N-(2-hydroxyethyl)-1,8-naphthalimide with intense green fluorescent was synthesized. This low molecular weight compound was immobilized by forming a covalent-bond with an acrylonitrile polymer containing carboxylic acid groups. The new prepared dye and self-coloured polymer were characterized by analytical techniques.

The synthesized compounds were characterized by TLC, DSC, FTIR, 1HNMR, 13CNMR, GPC, UV–visible and Fluorometery. The photophysical characteristics of the dye and polymer containing naphthalimide moiety in the side chain, were measured both in the absence and in the presence of Ag⁺, Cd⁺², Co⁺², Cr⁺³, Cu⁺², Fe⁺³, Hg⁺², Ni⁺², Pb⁺² and Zn⁺² cations.

The results showed that the characterization of the synthesized dye and its polymer verified their structural correctness. It is shown that dye and polymer are photo-induced electron transfer (PET) fluorescent sensors which exhibit fluorescence quenching in the presence of metal ions. Among the various metal ions, both dye and polymer are more sensitive to Fe⁺³ cations.

This study is original. A 4–(2-aminoethylene) amino-N-(2-hydroxyethyl)-1,8-naphthalimide and its self-coloured polymer were synthesized for the first time, successfully.

Presents an update on paints for plastics, including automotive industry components. Answers the questions: why do we need to paint plastics? What are the markets for them? What type of paint is used for which type of plastic? What are the typical problems and how can they be overcome?

GREAT BRITAIN Cathodic protection applications using platinum anodes. The commercial development of cathodic protection for industrial applications has been hindered by the choice of anode materials available to the corrosion engineer. Galvanic anode materials, such as zinc, magnesium and aluminium alloys, have been used successfully in marine applications, but, due to high cost, frequent renewal and large bulk, their use has been limited.

Mirage Inks develop ultraviolet cured flexographic and gravure inks to allow printers to avoid the high cost of meeting impending EPA and COSSH regulations on solvent retrieval.

IN RECENT issues (April, Stopwatch and Book Reviews, June) we referred to the possibility of a factory where the sole human was a person pressing buttons at a control centre. All else was done by automation.

The purpose of this paper is to modify the photostability of organic fluorescent dyes and to develop and evaluate a route of their derived polymeric fluorescent dyes.

A series of novel polymeric fluorescent dyes were prepared using 3-(2-benzimidazolyl)-7-(diethylamino)-coumarin (disperse yellow 8GFF, abbreviated as 8GFF) and polyethylene glycol (PEG) as raw materials. First, an intermediate of carboxyl functioned 8GFF was prepared by condensation reaction of 8GFF and pyromellitic dianhydride; and then the polymeric fluorescent dyes were synthesized by reacting PEG with the condensate intermediate.

FTIR, UV-vis, and PL showed that the polymeric fluorescent dyes had been successfully synthesised, and the photostability of organic fluorescent dyes was improved significantly.

In the present work, the polymeric fluorescent dyes had been successfully synthesized, and the photostability of organic fluorescent dyes was improved significantly. This methodology can be employed to prepare novel polymeric fluorescent materials and to improve the photostability of organic dyes for various applications.

Polycondensable dyes offer a new area of material science which can be widely used in coloured polymer materials production.

The method developed in the study reported in this paper provided a new strategy to develop new types of polycondensable dyes materials with fluorescent property.