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hyperbranched polyarylenes from Copolycyclotrimerization

Journal of Wuhan University of Technology(Materials Science) 2002年第2期17卷 86-89页

作者： LUOJing-dong JackyWYL TANGBen-zhong 程琳 PENGHan WuhanInstituteofChemicalTechnologe HongKongUniversityofScienceandTechnology

High molecular weight hyperbranched polyarylenes were synthesized in high yields by one-pot copolycyclotrimerizations of 2,5-diethynylthiophene (1), 4,4' -biphenyldiyne (2) and 2,7-diethynylfluorenes (3) with l-heptyne (4) and 1-dodecyne (5) using TaCl5·Ph4Sn catalysts in toluene. The structures and properties of the polymers were characterized and evaluated by 1R, NMR, TGA, UV, fluorescence and optical limiting analyses. All the polymers possess high thermal stability and emit strong blue light upon UV irradiation, whose intensities are higher than that from poly( 1 -phenyl-1 -octyne) ( PPO) , a well-known highly luminescent disubstitut-ed polyacetylene. Little aggregation-induced red shift in the photoluminescence is observed in the thin films of the polymers.

关键词： hyperbranched polyarylenes synthesis light emission light limiting

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Advanced Polymeric Materials for High-tech Innovations

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Chemical Research in Chinese Universities 2001年第Z1期17卷 59-页

作者： TANG BenZhong Department of Chemistry Hong Kong University of Science Technology Clear Water Bay Kowloon

High technology is advancing our society and modernizing our life and advanced materials play an important role in the technological innovations. My research group has been working on the development of advanced polymeric materials and in this talk I will report our recent work on the creation of new conjugated polymers with novel molecular structures and unique materials properties.1-18 Our work include the design of molecular structures of monomeric building blocks, development of stable, effective and environmentally benign "green” polymerization catalysts, discovery of new polymerization reactions, synthesis of functional macromolecules, fabrication of nanodimensional composites, assembly and control of hierarchical structures, and construction of electrooptical devices. We have revealed the liquid crystallinity, light emission, photoconductivity, optical limiting, nano-hybridization, solvatochromism, optical activity, self-organization, and biological activity of the linear polyacetylenes and hyperbranched polyarylenes. The utilization of the advanced polymers and their interesting materials properties for high-tech innovations will be discussed.

关键词： molecular structures hyperbranched polyarylenes hierarchical structures environmentally benign polymeric materials conjugated polymers biological activity advanced materials building blocks

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