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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

 
Title
Ring-Opening Metathesis Polymerization and Hydrogenation of Ethyl-substituted Tetracyclododecene
Author
Oh Joon Kwon, Huyen Thanh Vo, Sul Bee Lee, Tae Kyung Kim, Hoon Sik Kim, Hyunjoo Lee,*,
Keywords
Ring-opening metathesis polymerization (ROMP), Hydrogenation, 2D NMR technique, Tetracyclododecene
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 oC 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.
Page
2737 - 2742
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