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[Visitor (112.21.*.*)]answers [Chinese ]Time :2022-01-31
The term "vulcanization" has its history, because the original natural rubber products with sulfur as a crosslinking agent for crosslinking and named, with the development of the rubber industry, can now be crosslinked with a variety of non-sulfur crosslinking agents. Therefore, the more scientific significance of vulcanization should be "crosslinking" or "bridging", that is, the process of linear polymers forming a network of polymers through crosslinking. Physically, it is the process of converting plastic rubber into elastic rubber or hard rubber. The meaning of "vulcanization" includes not only the process of actual crosslinking, but also the method by which it is produced.
Rubber macromolecules undergo a chemical reaction with the crosslinking agent sulfur under heating, and the process of crosslinking becomes a three-dimensional network structure. The rubber after vulcanization is called vulcanized rubber. Vulcanization is the last process in rubber processing, and it is possible to obtain a stereotyped rubber product with practical value. In the mesh structure of rubber, sulfur cross-linked bonds (wherein the atomic number of sulfur n≥1; The density of uncrossed sulfur atoms is Sx or Sy) determines the degree of vulcanization of rubber. The latter, in process practice, is judged by the macroscopic physical and mechanical properties of the rubber or the change of rubber viscosity.
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