Network Formation and Reinforcement Studies with Terminally Brominated Polybutadiene

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Abstract
1. It is possible to form essentially complete elastomeric network structures by the reaction of terminally functional polymers with multifunctional curative agents. The process occurs in two distinct rate steps: rapid reaction up to the region of the gel point, followed by much slower reaction of the remaining sites. 2. Reinforcement of such systems with carbon black, to provide strength properties similar to analogous conventional elastomers, is possible. Such reinforcement occurs in the absence of heat and of free-radical processes normally associated with the mastication and vulcanization of rubber. 3. Chemically inert particles (esterified silica) produce reinforcement effects similar to carbon black. When chemical interaction with the elastomer network is deliberately introduced, modulus increases and tensile strength declines. A slight degree of chemical interaction is not disadvantageous, but high levels of interaction result in severe loss of extensibility and strength.

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