有機多硫化物の研究-6-
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概要
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The authors who have described the reaction bewteen organic polysulphides and several chemical reagents, describe in this paper the reaction between polysulphides and metallic oxides, making organic polysulphides and mercaptan react on metallic oxides (ZnO, PbO) for 6 hours at 135°C, and then isolating and identifying the reaction products.<BR>Organic polysulphides and mercaptans used are benzyl type and tolyl type mono-, di-, tri-, tetra-sulphides and mercaptans.<BR>These mercaptans react easily with ZnO and PbO and give mercaptides. Formation of disulphides was also observed, probably due to oxidation, but metallic sulphides were not formed under these reaction conditions.<BR>The authors formed that mono- and disulphides did not react with ZnO and PbO. Tri- and tetrasulphides react with ZnO and PbO and produce zinc sulphide and lead sulphide. In the reaction with PbO there occurred devulcanisation reaction, and tri-, tetrasulphides changed themselves into disulphides, while in the reaction with it was observed that tolyl tri- and tetrasulphides showed no effect, but that benzyl tri- and tetrasulphides changed themselves into stilben and benzaldehyde.<BR>It is supposed that there occurs not forming reaction due to combined sulphur when polysulphide type synthetic rubber is vulcanised with ZnO or PbO, but in the reactions between organic polysulphides and metallic oxides, no formation of such compound was seen. Thus the authors have reached a conclusion that vulcanisation of polysulphide type synthetic rubber means that -SH radical in the terminal group makes captide- or sulphide-reaction and the polymerisation degree is raised.
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