| Abstract: | Trans-1-(3-vinyl-9-carbazolyl)-2-(9-carbazolyl)cyclobutane(I) was synthesized. Homopolymerization of I and copolymerization with 9-ethyl-3-vinylcarbazole(II) were conducted cationically. It was found that I polymerized to high molecular weight polymers (< 105) with good yields, although its polymerizability was lower than that of II. Copolymer composition was determined by gel permeation chromatology (GPC) analysis, based on the remaining monomer ratio. Fluorescence spectroscopy indicated that poly(I) did not form excimer. Excimer emission gradually appeared with increasing II content in poly(I-co-II) to the homopolymer of II. This difference between poly(I) and poly(II) was attributed to the crowded and sterically distorted chromophore assemblies in poly(I). 1H- and 13C-NMR spectroscopy of cyclobutane groups in poly(I) compared with that in the monomer model compound supported the conclusion derived from fluorescence study. |
