Selfvulcanizing mixtures of elastomers
Basing on the literature data the scope of investigations, the known mixtures of reactive elastomers, the proposed mechanisms of selfvulcanization as well as the main properties of vulcanizates were discussed. In the absence of the conventional low-molecular-weight crosslinking agents in such mixtures, the functional groups of one component are able to selfvulcanize the other component. The selfvulcanizing elastomer mixtures comprise two-component systems of ENR—XNBR, ENR—CSM, ENR—CR, CSM—XNBR, CR—XNBR, C1IIR—XNBR, three-component systems of ENR—XNBR—CR and ENR—CSM—XNBR as well as the elastomer—plastomer systems such as CR—PAA [symbols of elastomers — see the text; PAA — poly(acrylic acid)]. Depending on the composition, such systems can be either compatible in the thermodynamic sense (e.g., ENR—XNBR, ENR25—CSM,ENR50—CR, ENR50—XNBR—CR and ENR50—CSM—XNBR systems) or they can form microheterogeneous mixtures (e.g., ENR50—CSM, CR—PAA and CSM—NBR systems). In the case of three component mixtures, one of the components of the system plays the role of a reactive compatibilizer in respect to the other two immiscible components: such role plays, e.g., ENR50 in XNBR—CR mixture or XNBR in ENR50—CSMmixture. Basing on the results of own work, the possibility of using chlorinated rubber for crosslinking of ENR, SBR, NBR and HNBR was investigated and some properties of such vulcanizates characterized.
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