Search results

This paper presents an eco-friendly method for wool fabrics to improve printing characteristics without thermal fixation via a UV/ozone pre-treatment. Such treatment causes surface morphological changes and oxidizes wool fabric surfaces. In this study, the changes in surface composition and chemistry induced by this treatment were followed by measuring changes in electron spin resonance (ESR) intensity values and mechanical properties, including tensile strength, elongation percentage and air permeability of the treated wool fabric samples. The pre-treated fabrics were printed and their colour strength (K/S) values with all colour parameters were measured. Fastness properties, such as colour fastness to light, washing and perspiration, were evaluated. Printability of the pre-treated fabrics was compared with that of the printed fabrics by conventional methods. The results showed that the UV/ozone treatment improved printing fixation of dye without energy consumption which is required by conventional methods. The UV/ozone treatment imparts highly printed shades of woolen fabrics at reduced energy with excellent fastness properties of the pre-treated printed fabrics.

Reviews the various physical methods available for the detection of irradiated foods in the areas of: measuring changes in physical properties; luminescent detection; and electron spin resonance. Concludes that many of the techniques hold great potential as simple screening methods.

Molybdenum dithiocarbamate (MoDDC) has good antiwear and friction‐reducing properties in lubricants, and can be protected against thermo‐oxidative degradation. However, MoDDC‐containing lubricants may lose their ability to reduce friction over time, which may result from its concentration in oils below a critical concentration owing to oxidative degradation of MoDDC. Thus, in order to enhance the durability of the low friction performance of MoDDC, the paper aims to investigate good synergistic antioxidants with MoDDC.

The antioxidation properties of molybdenum dialkyldithiocarbamate (M 807) – and p,p‐dioctyldiphenylalmine (V 81) – or mixed octylated and butylated diphenylalmines (V 961)‐containing poly‐α‐olefin (PAO)‐derived lubricants were evaluated by differential scanning calorimetry (DSC) and modified penn state micro‐oxidation test (PMOT). DSC test measures incipient oxidation temperature (OT) and oxidation induction time (IT) of the lubricant at high temperatures and the oxidation stability of oil weight loss is measured by PMOT. Moreover, the oxidized samples were analyzed by Fourier transform infrared (FTIR) and electron spin resonance (ESR).

A DSC test shows that OT and IT of V 81‐ or V 961‐containing PAO were improved significantly by M 807 addition. A PMOT indicates that when combining with V 81 antioxidants, M 807 can also effectively reduce the increase in weight loss of PAO and deposits formed in oils. These results suggest that the M 807 shows a good antioxidative synergism with alkylated diphenylamine antioxidants. In addition, FTIR results from a PMOT confirm that the addition of M 807 can significantly enhance the oxidation IT of oils containing V 81 and inhibit formation of oxidation products including carbonyl bonds or hydroxyl group. ESR analysis from a PMOT indicates that M 807 may form stable radicals with arylamine by the coordination effect.

This paper provides simple and quick methods to evaluate synergistic antioxidation properties between different types of additives, and a mechanism of the inhibition involving a synergy was proposed. They can offer practical help in industrial applications and to an individual starting out on an academic career.

Despite public unease, certain irradiated foods will be legally on sale in the UK in 1990. The irradiation process is outlined and its applications described. At present 36 countries have legalised the process and more than 40 different foods are treated. Although the process has as yet no detection method, all products so treated will be identified. The main initial application in the UK will probably be spices and herbs, whose decontamination is currently problematic.

The purpose of this study to investigate the synthesis of new Cr(III), Fe(III), Ni(II) and Cu(II) Schiff base complexes by a simple technique (microwave technique). The evaluation of the prepared complexes as pigments as corrosion resistant was also explored.

The Schiff base complexes were prepared by using microwave method (green chemistry), and then, the physico-chemical requirements according to standards for the synthesised pigments were investigate.

The prepared complexes exhibit good physical, mechanical and corrosion properties as pigments in paint formulations.

The simple technique used for synthesis of metal complex pigments will significantly increase the cost saving for the manufacturing of such pigments category. Also, the used technique is considered a green method (eco-friendly), as there no organic solvent was used.

The evaluation of the prepared complex pigments as corrosion resistants was also studied.

It is a simple technique, green synthesis (no solvent used) is involved and high yield is obtained.

A review of the common photodegradation processes in polymeric coatings is presented, and the photoactivity of titanium dioxide and its consequences are discussed. Experimental work which explores the durability implications of the use of titanium dioxide in coatings is presented. This includes the effects of pigment flocculation, film thickness and photostability of the pigment. The importance of the correct selection of light source for accelerated weathering is stressed. Finally, results are presented from a recent study of the influence of geographical location on the weathering of titanium dioxide pigmented paint films.