Heat-curable vulcanizate

HCV heat-curable vulcanizate H-NBR hydrogenated nitrile rubber... 

A 96-4 TMO-AGE copolymer prepared under conditions to make it reasonably uniform gave an interesting sulfur-curable elastomer. Preliminary vulcanizate data on this elastomer show good tensile and tear properties, a low Tg (-75 C.), high resilience, and good heat resistance. Further development of this family of interesting elastomers requires a lower cost route to TMO. Copolymerizations of TMO with other epoxides and oxetanes as well as the polymerization of other oxetanes are also described. 

If this is the case, it would be necessary to remove all the water present in order to force the equilibrium completely toward diimine formation and the establishment of permanent cross-links. Experimental evidence for this proposition is that a full state of cure is not attained if the long heating process is carried out in the mould, i.e. in a virtually closed system. Hydrolysis is also demonstrated by the fact that much of the diamine present in a vulcanizate can be extracted by treatment with water. It may be noted here that vinylidene fluoride-hexafluoropropylene copolymers which are peroxide-curable do not lead to water formation and so give vulcanizates with reduced porosity. 

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See also in sourсe #XX -- [ ]

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