Depolymerized liquid natural rubber

Liquid natural rubber, SBR, acrylonitrile elastomers, neoprene, and chlorosulfonated polyethylene are also used as sealant compositions. Filled depolymerized natural rubber and SBR latex are readily cured at room temperature by the incorporation of ultraaccelerators. 

Explosive, Flexible of Kegler. It may be prepd by mixing an expl with an elastometer (depolymerized natural or synthetic rubber) and a vulcanizing agent. Vulcanization is cmried out simultaneously with formation of the product. For example, 500g dry PETN of particle size natural rubber(such as... 

Hydroxy-terminated natural rubber (HTNR) It is a honey-colored viscous liquid and is prepared by the depolymerization of masticated natural rubber (NR) in the presence of H202 in toluene. Similar to other polyols, it is curable with TDI/MDI. Some important attributes of HTNR are ... 

Polymeric sulfur is produced commercially as insoluble sulfur (IS) and is used in the rubber industry [56] for the vulcanization of natural and synthetic rubbers since it avoids the blooming out of sulfur from the rubber mixture as is observed if Ss is used. The polymeric sulfur (trade-name Crys-tex [57]) is produced by quenching hot sulfur vapor in liquid carbon disulfide under pressure, followed by stabilization of the polymer (against spontaneous depolymerization), filtration, and drying in nitrogen gas. Common stabilizers [58] are certain olefins R2C=CH2 like a-methylstyrene which obviously react with the chain-ends (probably -SH) of the sulfur polymer and in this way hinder the formation of rings by a tail-bites-head reaction. In this industrial process the polymer forms from reactive small sulfur molecules present in sulfur vapor [59] which are unstable at ambient temperatures and react to a mixture of Ss and on quenching. 

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