21. Additionally, solid silicone rubber materials are processed at higher temperatures and require longer vulcanization times. 22. For example, the vulcanization of polyisoprene results when mercapto radicals couple forming disulfide and polysulfide crosslinks. 23. Hutchison had obtained a license in 1850 from fellow American Charles Goodyear's patented vulcanization process. 24. "' Sodium lignosulfonate "'( lignosulfonic acid, rubber vulcanization , organic polymerization. 25. It is also useful as a catalyst for transesterification and for the room temperature vulcanization of silicones. 26. Driven by software, a series of robots carry the tires right through construction to molding and vulcanization . 27. Elastomers are usually thermosets ( requiring vulcanization ) but may also be thermoplastic ( see thermoplastic elastomer ). 28. In the rubber and plastics industries, it is an antioxidant, vulcanization accelerator, and radical scavenger. 29. Western inventors discovered the properties of gutta-percha latex in 1842, although the people of its vulcanization . 30. As mentioned previously, vulcanization is a necessary step to prepare the uncured silicone mold for spin casting production.
