Poly(1,6-heptadiyne) derivatives with phenoxy and 3,7-dimethyloctyloxyphenoxy substituents were synthesized using metathesis polymerization. Polymerizations using MoCl 5 as the sole catalyst gave high yields and the resulting polymers were completely soluble in organic solvents. The polymers' structures and thermal properties were characterized using NMR and UV-Vis spectroscopy, as well as with TGA and DSC thermograms. From the analysis of the high-resolution 13 C-NMR spectra, we was found that these polymers contain six-membered rings.The number-average molecular weights and polydispersities of the polymers were ca. 7.0~20 Ý10 3 and 3.1~5.8, respectively. The glass transition temperatures of the polymers were found to be in the range 91~159 o C.
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