Polymer architecture via abstraction of a hydrogen, can create a mid-chain growth site. Branching can be quantified by the branching index. An effect related to branching is chemical crosslinking - the formation of covalent bonds between chains. Crosslinking tends to increase T and increase strength and toughness. Among other applications, this process is used to strengthen rubbers in a process known as vulcanization, which is based on crosslinking by sulfur. Car tires, for example, are highly crosslinked in order to reduce the leaking of air out of the tire and to toughen their durability. Eraser rubber, on the other hand, is not
The Sulphur Institute Symposium. The symposia are attended by producers, consumers, and traders in sulfur, as well as industry service providers, and feature speakers discussing a range of topics relating to sulfur. The 2010 Sulphur World Symposium was held in Doha, Qatar, from April 12 through April 15, 2010. The 2010 symposium featured a tour of the Ras Laffan Industrial City, which is not normally available to the public. Publications by The Sulphur Institute include market studies, industrial publications, general brochures about sulfur, and brochures on the agricultural uses of sulfur. Symposium proceedings are also available. Most publications are available in English, with