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Ktc/ktd)', when chain transfer is significant, or when unattached radicals are generated the calculation is more cumbersome, although conventional. Allowance must be made for initiator consumption during reaction, if this is significant. The relevant procedure has been described in earlier papers 4 ' 5 ; unfortunately, available data do not always allow corrections for consumption to be made with certainty, so that uncertainties in some network parameters are inevitable at present (cf. Table 1).

B) Schematic representation of network II (Table 4. X, Y represent PCP, PVTCA chains trapped in the 'wrong' phases). ~ PCP chains; PVTCA chains. The situation is naturally more complicated with network II {Table 4\ in which the crosslink density is much higher. Figure 8 suggests that the domain size is not very different (perhaps a little smaller), but the interdomain separation is greatly reduced. We believe that the basic domain structure is similar to that in Figure 9a, but that the domains must now be linked together, predominantly by PVTCA (see Figure 9b), but probably by some polychloroprene in addition (X, Figure 9b).

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