ポリカルボジイミド複合材料の開発と応用(<小特集>高分子材料小特集)

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The carbodiimide linkage is obtained by the condensation reaction of isocyanate groups. Conventional methods of preparing polycarbodiimides yield temperature-resistant polymers. However, due to crosslinked structures, processing of the polymers is very difficult. The authors have found a novel method of synthesizing high molecular weight polycarbodiimides having linear structure. Therefore, the resulting polycarbodiimide can be easily processed as a matrix resin for various composites. For instance, high temperature-resistant polymers can be prepared by the reaction of the polycarbodiimide with a triazine type crosslinking agent at an elevated temperature. Selfcrosslinking can occur at the same time to produce dimer and trimer of carbodiimide linkages. Two kinds of stampable sheet, G-sheet and M-sheet, have been developed by applying the resin to their matrix. G-sheet consisted of a needle-punched glass fiber mat impregnated from both surface side with the above polycarbodiimide and crosslinking agent. After stamp molding, this sheet showed superior-properties in temperature resistance and thermal insulation. So, the sheet can be applied to a variety of covering materials for electric parts which require temperature-resistant thermal insulation. Some application examples include control boxes for heaters, covering materials for heating elements of facsimiles and copy machines, automotive parts insulators for fuel tanks, engine rooms, generatos, and exhaust systems. On the other hand, M-sheet consisted of a melamine foam as the core material instead of a glass fiber mat in the case of G-sheet. This sheet is now being examined as noise absorbing and heat-insulating materials for automotives, such as hood-insulating and dash-silencers. All of these formed products can be produced by means of stamping.
社団法人日本材料学会の論文
1992-06-15

ポリカルボジイミド複合材料の開発と応用(<小特集>高分子材料小特集)

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