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New aromatic benzazole polymers, 3. Synthesis of rigid‐rod benzobisazole polymers with main‐chain 2,2'‐bipyridine‐5,5'‐diyl units
Author(s) -
Tan LoonSeng,
Burkett Jerald L.,
Simko Sharon R.,
Alexander, Jr. Max D.
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990101)20:1<16::aid-marc16>3.0.co;2-4
Subject(s) - polymer , monomer , bipyridine , polymer chemistry , materials science , 4,4' bipyridine , lyotropic , conductivity , chemistry , crystallography , molecule , crystal structure , organic chemistry , liquid crystalline , composite material , hydrogen bond
SUMMARY: Rigid‐rod benzobisthiazole ( Bipy‐PBZT) , benzobisoxazole ( Bipy‐PBO ) and benzobisimidazole ( Bipy‐PyBI ) polymers containing 2,2'‐bipyridine‐5,5'‐diyl moieties were synthesized from 2,2'‐bipyridine‐5,5'‐dicarbonyl dichloride and one of the following monomers: 2,5‐diamino‐1,4‐benzenedithiol, 4,6‐diamino‐1,3‐benzenediol, and 2,3,5,6‐tetraaminopyridine. Bipy‐PyBI is the first rigid‐rod benzobisimidazole polymer without any solubilizing pendants that exhibits lyotropic behavior. These polymers displayed thin‐film electrical conductivity of ≈10 –10 –10 –8 S/cm in pristine state; 10 –5 –10 –4 S/cm upon infiltration with AgNO 3 ; 25–42 S/cm after Ag + → Ag 0 reduction by NaBH 4 .