Five novel carbazole-containing polymers, i.e., poly (3,6-di-tert-butyl-9-prop-2-ynylcarbazole) [poly(t-Bu2CzPr)], poly(9-but-2-ynylcarbazole) [poly(CzBu)], poly (3,6-di-tert-butyl-9-but-2-ynylcarbazole) [poly(t-Bu2CzBu)], poly(9-(4-ethynylphenyl)carbazole) [poly(p-CzPA)], and poly(9-(4-prop-1-ynylphenyl)carbazole) [poly(p-CzPPr)] were synthesized by the polymerization of the corresponding carbazolecontaining acetylene monomers using [(norbornadiene)RhCl]2-Et3N, WCl6, MoCl5, TaCl5, and NbCl5 in conjunction with Sn, Bi, Sb, and Si cocatalysts and W(CO)6-hν/CCl4 catalysts. The UV-vis absorption band edge wavelengths of poly(t-Bu2CzPr) and poly(p-CzPA) were longer than those of the corresponding polymers substituted by methyl group at the main chain, poly(t-Bu2CzBu) and poly(p-CzPPr), respectively. The band edge wavelengths of phenylene-spacer-containing polymers, poly(p-CzPA) and poly(p-CzPPr), were longer than those of methylene-spacer-containing polymers, poly(t-Bu2CzPr) and poly(t-Bu2CzBu), respectively. Poly(p-CzPA) obtained by WCl6-n-Bu4Sn-catalyzed polymerization exhibited UV-vis absorption apparently at a longer wavelength than the MoCl5-n-Bu4Sn-based counterpart did. Poly-(t-Bu2CzPr) showed photoconductivity. The temperatures for 5% weight loss of the polymers were around 300-350 °C under air.

The polymerization of isobutyl vinyl ether (IBVE) and tert‐butyl vinyl ether (TBVE) was carried out with metallocene and nonmetallocene catalysts, and the stereoregularity of the formed polymers was examined with 13C NMR spectroscopy. IBVE afforded polymers with 63–68% dyad isotacticity by polymerization with mixtures of metallocene catalysts and methyl aluminoxane as a cocatalyst in toluene as a solvent. However, TBVE yielded polymers with 47–52% dyad isotacticity (21–28% triad isotacticity) under the same conditions, the isotacticity being lower than that of poly(isobutyl vinyl ether) (PIBVE). Nonmetallocene catalysts, including Ti, Zr, and Hf complexes with two phenoxy imine chelate ligands, provided PIBVE and poly(tert‐butyl vinyl ether) with 63–68 and 45–51% dyad isotacticity, respectively. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3938–3943, 2002