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Characteristics of liquid‐crystalline cholesteryl and cyanobiphenyl side chains pendent to trans ‐polypentenamer
Author(s) -
Cho Iwhan,
Chang Kyeongho
Publication year - 1997
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/marc.1997.030180107
Subject(s) - thermotropic crystal , mesophase , monomer , polymer , side chain , polymer chemistry , polymerization , liquid crystal , liquid crystalline , materials science , crystallography , chemistry , organic chemistry , optoelectronics
trans ‐Polypentenamers with thermotropic liquid‐crystalline side chains cholesteryl and cyanobiphenyl were prepared by ring‐opening polymerization of vinylcyclopropane monomers with proper substituents. Molecular weights of the polymers were in the range of 25000 to 80000 and the ratios of weight‐ to number‐average molecular weights M w / M n were between 3.3 and 3.8. The glass transition temperature values of the polymers were 35°C ( 4a ) and 39°C ( 4b ). Monomers 3a and 3b present cholesteric and smectic mesomorphism, respectively. On the other hand, polymers 4a and 4b present only a smectic mesophase.