No abstract available

[en] During the last decade radiation cured polymers have continued to grow in importance not only by expansion within existing coatings applications but also by extension into new fields of application such as ceramics, ink-jet inks and fibres. To provide a further update on the rapidly growing science and technology of radiation curing the Third International Symposium was held. Apart from providing an update on the application, chemistry and control aspects of the radiation curing the aim of the meeting was also to provide the newcomer with a basic insight into radiation curing applications. Accordingly the proceedings contained in this special publication which follow closely the format of the meeting, has five sections covering the background/trends, applications, initiator chemistry, substrate chemistry and analytical, physical chemical and health and safety aspects. There are twenty-five papers all told, three of which are indexed separately. (Author)

[en] A high sensitivity lyoluminescence dosimetry system is being developed, in which pure water is replaced by a solution of a sensitizer. As yet, three sensitizers have been used: luminol, lucigenin and lophin. Luminol (3-aminophthalhydrazide) enhances the amount of light by many orders of magnitude, thus, in principle, obviating the need to use a photomultiplier in the reader, in favour of a photodiode, which can be used instead. However, at this moment there are considerable difficulties in eliminating the self-glow of luminol solution, cause by the oxidation by atmospheric oxygen dissolved in water. With the use of luminol it is expected to obtain sensitivity of an order of 50 - 100 millirads

[en] Published in summary form only

[en] The consolidation and restoration of a variety of wooden agricultural and farmer's tools like rakes, pitchforks, scythes, wagon shafts, a dung-fork and a baker's peel is described. The partly quite spreading objects caused some problems during impregnation and the following curing by gamma radiation. The solution of these problems is as well discussed as the restoration of the fragmented tools. (Author)

[en] In comparing radiation cure versus conventional heat cure systems, the factors are considered in this studies i.e. environmental laws - includes the future regulations concerning volatile organic emissions and waste disposal may weigh heavily in the decision

[en] Compositions comprising an impermeable acrylate-terminated oligomer, at least one reactive diluent, and 2-hydroxycyclo-hexylphenone, diethoxyacetophenone, 1-(4-dodecylphenyl)-2-hydroxy-2-methylpropan-1-one, or 2-hydroxy-2-methyl-1-phenyl-propan-1-one as a photoinitiator, are disclosed. These compositions have utility in optical coatings

[en] Investigations using environmental simulation are designed to reveal cause-and-effect mechanisms in ageing and weathering processes. Issues of artificial ageing and timelapsing play an important role. The 29 contributions to the 21st Annual Conference deal in particular with the topics: strategies in environmental simulation, irradiation and exposure testing of polymers, atmospheric influences and air ingredients, and mechanical environmental influences. (orig./DG)

[en] The equipment consists of sources of ionizing radiation and low-energy electromagnetic radiation. The material being irradiated is positioned such as to be exposed to both types of radiation. Shielding materials, collimation systems or mirrors for directing the radiation can be inserted between the irradiated material and the sources. (E.J.). 2 figs

[en] In the beginning of the seventies the two types of radiation sources applied in industrial processes, electron radiation and UV, had been given rather optimistic forecasts. While UV could succeed in the field of panel and film coating, electron radiation curing seems to gain success in quite new fields of manufacturing. The listing of the suggested applications of radiation curing and a comparison of both advantages and disadvantages of this technology are followed by a number of case studies emphasizing the features of these processes and giving some examplary calculations. The data used for the calculations should provide an easy calculation of individual manufacturing costs if special production parameters, investment or energy costs are employed. (Author)