Solid‐state NMR studies of cis‐1,4‐polyisoprene crosslinked with dicumyl peroxide in the presence of triallyl cyanurate |
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Authors: | Sung Joon Oh Jack L. Koenig |
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Abstract: | The network of dicumyl peroxide (DCP)/triallyl cyanurate (TAC) crosslinked cis‐1,4‐polyisoprene was studied by solid‐state NMR techniques such as direct‐polarization (DP), cross‐polarization (CP), and proton T2 experiments. Line broadening and cis/trans isomerization of mobile carbons were observed in the DP experiments. The information on rigid carbons of network structures was observed with the CP technique. Motional heterogeneity was examined by proton T2 relaxation experiments. Decreases in long T2 (T2L) values from the mobile non‐network structures and short T2 (T2S) values from the rigid network structures were observed with an increase in peroxide or coagent concentration. The percentage of T2S in T2 relaxation, which is related to network density, was observed to increase with peroxide and coagent addition. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 1417–1423, 2000 |
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Keywords: | solid‐state NMR relaxation elastomer peroxide coagent crosslinking |
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