Figure 6. Proposed mechanism of UV prevulcanization.A comparison of the 13C NMR spectrum of the latex mixture
after irradiation for 1 h (spectrum d, Figure 5) with the spectra of the nonirradiated latex mixture (spectrum c, Figure 5) and the pure NR latex (spectrum b, Figure 5) showed an absence of the previously mentioned signals of C1 and C2 of the coagent.Cross-linking did not produce new signals, but this occurs commonly in cross-linking of NR. In addition, the UV irradiation for 1 h did not produce any new NMR signals, but it did decrease slightly the 13C NMR intensity ratio of the C19 signal to the C20 signal (Figure 5). Furthermore
Figure 6. Proposed mechanism of UV prevulcanization.A comparison of the 13C NMR spectrum of the latex mixtureafter irradiation for 1 h (spectrum d, Figure 5) with the spectra of the nonirradiated latex mixture (spectrum c, Figure 5) and the pure NR latex (spectrum b, Figure 5) showed an absence of the previously mentioned signals of C1 and C2 of the coagent.Cross-linking did not produce new signals, but this occurs commonly in cross-linking of NR. In addition, the UV irradiation for 1 h did not produce any new NMR signals, but it did decrease slightly the 13C NMR intensity ratio of the C19 signal to the C20 signal (Figure 5). Furthermore
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