By D. Bloor (auth.), Prof. D. Bloor, Dr. R. R. Chance (eds.)

The polydiacetylenes are a category of polymers which are attrac­ ting expanding consciousness around the globe. there are lots of purposes for this curiosity probably the most vital being the provision of many polydiacetylenes as macroscopic, prime quality, unmarried crystals. This truth was once first said within the pioneering paintings of Prof. G. Hegner at the solid-state polymerization of disub­ stituted diacetylenes within the overdue Nineteen Sixties. because then experiences of the polymerization procedure and the houses of monomers and polymers have complex realizing of solid-state reactivity and the physiCS of quasi-one-dimensional fabrics. extra lately paintings on soluble polydiacetylenes, gels and movies has been of curiosity for either educational and technological purposes. growth during this sector has required a mix of analysis disciplines starting from man made natural chemistry to reliable­ nation physics. The interdisciplinary attempt required for achievement­ ful study in polydiacetylenes used to be mirrored within the mixture of chemists, physicists and fabrics scientists who attended the Workshop. The rising strength for advertisement purposes of polydiacetylenes used to be additionally glaring within the approximately equivalent partici­ pation of educational and industrial/government scientists. The WOrkshop used to be the 1st significant foreign assembly to concentration completely on polydiacetylenes. It supplied a discussion board during which difficulties of mutual curiosity will be mentioned by way of scientists with varied backgrounds and pursuits. It additionally chuffed the necessity for a evaluate of the technology of those fabrics at a time while this easy knowing is resulting in technological applications.

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This interest was triggered largely by the work of Wegner(l) who identified the polymerization process as a 1,4-addition reaction. The Cl and C4 carbon atoms of adjacent diacetylene monomers link up to form fully-conjugated polymer chains. In many cases the reaction product is a single crystal of macroscopic dimensions with preservation of the structural order of the monomer single crystal. (2,3) Also, bond formation, for both initiation and propagation of the chains, involves a molecular rotation of the monomer molecules which has to overcome the repulsive forces of the lattice, thus providing an additional energy barrier associated with the initiation process.

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