Solid-state NMR studies of cis-1,4-polyisoprene crosslinked with dicumyl peroxide in the presence of triallyl cyanurate
✍ Scribed by Sung Joon Oh; Jack L. Koenig
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 168 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0887-6266
No coin nor oath required. For personal study only.
✦ Synopsis
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 T 2 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 T 2 relaxation experiments. Decreases in long T 2 (T 2L ) values from the mobile non-network structures and short T 2 (T 2S ) values from the rigid network structures were observed with an increase in peroxide or coagent concentration. The percentage of T 2S in T 2 relaxation, which is related to network density, was observed to increase with peroxide and coagent addition.