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Synthesis of thermotropic liquid crystalline polycarbosiloxanes and manifestation of nonclassical conjugation in polymer backbone
Author(s) -
Skorokhodov S.S.,
Osadchev A.Yu.,
Shamanin V.V.
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200110)175:1<239::aid-masy239>3.0.co;2-h
Subject(s) - thermotropic crystal , mesogen , polymer , carbon atom , methylene , atom (system on chip) , materials science , phenylene , polymer chemistry , conjugated system , photochemistry , chemistry , liquid crystalline , organic chemistry , ring (chemistry) , composite material , computer science , embedded system
Polysiloxanearylenes gain mesogenic ability by introduction of methylene joint group between Si‐atom and phenylene core of rigid section as it was shown previously. The investigation of model compounds showed the existence of electronic interaction between Si‐atom and β‐carbon atom of the backbone known in siliconorganic chemistry as β‐effect. The effect is considered as an example of nonclassical conjugation. An attempt to synthesize the polymer built from such segments led to obtaining of a nonclassicaly polyconjugated backbone. Preliminary characterization of polydimethylsilylxylilidene obtained as first example of nonclassicaly polyconjugated polymer is presented and mechanism of polyconjugation is proposed.