Ring-opening metathesis polymerization and hydrogenation of ethyl-substituted tetracyclododecene

Title
Ring-opening metathesis polymerization and hydrogenation of ethyl-substituted tetracyclododecene
Authors
권오준휴엔이슬비김태경김훈식이현주
Keywords
Ring-opening metathesis polymerization (ROMP); Hydrogenation; 2D NMR technique; Tetracyclododecene
Issue Date
2011-08
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 32, NO 8, 2737-2742
Abstract
Ring-opening metathesis polymerization (ROMP) of an ethyl-substituted tetracyclododecene (8-ethyltetracyclo[ 4.4.0.12,5.17,10] 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.
URI
http://pubs.kist.re.kr/handle/201004/45638
ISSN
0253-2964
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KIST Publication > Article
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