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Thermodynamic synthesis of solution processable ladder polymers.


ABSTRACT: The synthesis of a carbazole-derived, well-defined ladder polymer was achieved under thermodynamic control by employing reversible ring-closing olefin metathesis. This unique approach featured mild conditions and excellent efficiency, affording the ladder polymer backbone with minimum levels of unreacted defects. Rigorous NMR analysis on a 13C isotope-enriched product revealed that the main-chain contained less than 1% of unreacted precursory vinyl groups. The rigid conformation of the ladder-type backbone was confirmed by photophysical analysis, while the extended rod-like structure was visualized under scanning tunneling microscope. Excellent solubility of this polymer in common organic solvents allowed for feasible processing of thin films using solution-casting techniques. Atomic force microscopy and grazing incident X-ray scattering revealed a uniform and amorphous morphology of these films, in sharp contrast to the polycrystalline thin films of its small molecular counterpart.

SUBMITTER: Lee J 

PROVIDER: S-EPMC5530004 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature

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Thermodynamic synthesis of solution processable ladder polymers.

Lee Jongbok J   Rajeeva Bharath Bangalore BB   Yuan Tianyu T   Guo Zi-Hao ZH   Lin Yen-Hao YH   Al-Hashimi Mohammed M   Zheng Yuebing Y   Fang Lei L  

Chemical science 20151106 2


The synthesis of a carbazole-derived, well-defined ladder polymer was achieved under thermodynamic control by employing reversible ring-closing olefin metathesis. This unique approach featured mild conditions and excellent efficiency, affording the ladder polymer backbone with minimum levels of unreacted defects. Rigorous NMR analysis on a <sup>13</sup>C isotope-enriched product revealed that the main-chain contained less than 1% of unreacted precursory vinyl groups. The rigid conformation of th  ...[more]

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