TCI America 3-Ethynylaniline A1122

3-Ethynylaniline / 3-Aminophenylacetylene
Polyvinyl chloride and polyethylene polymers, which have long been the mainstay of industrial polymers, are now making way for new high performance polymers. Engineering plastics are polymers that have various properties designed into the polymer. For example, some polymers are designed for thermal resistance, such as polyamide, and polycarbonate, which are widely used these days. The thermal resistance of a polymer is determined by the softening point, as the softening point rises with the increase in the material strength. To make improvements in the softening points and material strength, the super engineering plastics such as polysulfone, polyether sulfone, polyarylate and polyimide have been developed. The softening points of these polymers are all above 150 °C, and these utilized in materials of ï¬reman uniform and ulletproof vest, and so on. Active R&D is continuing to take place to further improve the performance.1)
On the other hand, there have been active experiments in adding new functions to the polymers, such as the electrical, optical, medical and biological properties. For example, copolymers which are obtained by the polymerization of ï¬uorine containing monomers and variety of monomers have been utilized as photoresists, optical ï¬ber dressings, oxygen enrichment membranes, and membrane oxygenators. Polysilane has the maximum absorption in the ultraviolet region, and also has photosensitivity; therefore, it can be used as a positive type resist with excellent oxygen plasma resistance.2) Polylactic acid (PLA) has been commercialized as an environmentally-friendly polymer, being compatible with the natural environment. Furthermore, it can save fossil resources as it is made of biomass raw materials.3)
Further broad applications are expected to be made with functional polymers, thus R&D in this ï¬ eld is highly promising. The page below shows a wide variety of monomers and intermediates as building blocks for functional polymers. These are surely useful for the development of novel polymers.

3-Ethynylaniline / 3-Aminophenylacetylene
In 1977, Shirakawa and co-workers reported that thin films of the semi-conducting polymer polyacetylene show a dramatic increase in electrical conductivity when doped with controlled amounts of iodine.1) Their reports triggered intensive R&D into the electrical conductivity of plastic materials. Studies of conducting polymers began and, as a result, many Ï-conjugated polymers such as polypyrrole2), polythiophene3), polyaniline4) and polyphenylenevinylene5) have been developed. Among these polymers, many of them have been utilized practically. One example is an electrolytic condenser using polypyrrole. This condenser has characteristic features such as being compact and lightweight, as well as having high-capacity and high-frequency compliance. These features have achieved a downsizing and weight-saving in electronic devices, and are utilized currently in some mobile phones. Thereby, conducting polymers are widely used for electronic devices vital to our everyday life. These and many other achievements were the reasons Shirakawa received to the Nobel Prize Award in 2000.
Moreover, conducting polymers have been applied to solar cell materials. For instance, Kim et al. have reported the synthesis of the co-polymers 3 and 4, using 4,7-dibromo-2,1,3-benzothiadiazole (1) and 4,7-dibromo-2,1,3-benzoselenadiazole (2) as starting materials, respectively. According to their results, the bulk heterojunction solar cells composed of 3 or 4 with PC71BM give power conversion efficiencies of 1.12%6) and 1.34%7), respectively. Thus, further applications using conducting polymers can be fully expected in many areas.