In nonirradiated films, the coagent and the photoinitiator in the different samples did not generate chemical cross-linking.
Thus, within a few hours of the swelling test, the films became gels and could not retain their shape. Furthermore, the tensile
strength of the nonirradiated films containing the coagent and the photoinitiator was comparable to the green strength of the
NR film (tensile strength = 1.57 MPa),24 as shown in Figure 3e.In view of these results, the reduction in the intensity ratio of
the CC signal (Figure 5) upon irradiation is indicative of a loss of some CC in isoprene units through cross-linking.
In nonirradiated films, the coagent and the photoinitiator in the different samples did not generate chemical cross-linking.Thus, within a few hours of the swelling test, the films became gels and could not retain their shape. Furthermore, the tensilestrength of the nonirradiated films containing the coagent and the photoinitiator was comparable to the green strength of theNR film (tensile strength = 1.57 MPa),24 as shown in Figure 3e.In view of these results, the reduction in the intensity ratio ofthe CC signal (Figure 5) upon irradiation is indicative of a loss of some CC in isoprene units through cross-linking.
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