Ring-opening metathesis polymerization and hydrogenation of ethyl-substituted tetracyclododecene
- Ring-opening metathesis polymerization and hydrogenation of ethyl-substituted tetracyclododecene
- 권오준; 휴엔; 이슬비; 김태경; 김훈식; 이현주
- Ring-opening metathesis polymerization (ROMP); Hydrogenation; 2D NMR technique; Tetracyclododecene
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 32, NO 8, 2737-2742
- Ring-opening metathesis polymerization (ROMP) of an ethyl-substituted tetracyclododecene (8-ethyltetracyclo[
18.104.22.168,5.17,10] dodec-3-ene, Et-TCD) was carried out in the presence of a ternary catalyst system
consisting of WCl6, triisobutyl aluminium (iso-Bu3Al), and ethanol. The optimal molar ratio of Et-TCD/WCl3/
iso-Bu3Al/ethanol was found as 500/1/3/2 at which the yield of ring-opened polymer was 100%. 1-Hexene was
shown to be an effective molecular weight controlling agent for ROMP reaction of Et-TCD. The hydrogenation
of the ring opened polymer (p-Et-TCD) was conducted successfully using Pd(5 wt %)/γ-Al2O3 at 80 ℃ for 1 h.
Chemical structures of p-Et-TCD and its hydrogenated product(H2-p-Et-TCD) were characterized using 2D
NMR techniques (1H-1H COSY and 1H-13C HSQC). The changes of physical properties such as thermal
stability, glass transition temperature and light transmittance after the hydrogenation were also investigated
using TGA, DSC, and UV.
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