Open AccessA bidirectional screw‐sense induction of poly(quinoxaline‐2,3‐diyl)s that depends on the degree of polymerization
Author(s) -
Nagata Yuuya,
Nishikawa Tsuyoshi,
Terao Ken,
Hasegawa Hirokazu,
Suginome Michinori
Publication year - 2019
Publication title -
journal of polymer science part a: polymer chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.768
H-Index - 152
eISSN - 1099-0518
pISSN - 0887-624X
DOI - 10.1002/pola.29224
Subject(s) - quinoxaline , cyclohexane , degree of polymerization , polymerization , copolymer , polymer , degree (music) , polymer chemistry , asymmetric induction , chemistry , materials science , organic chemistry , physics , catalysis , enantioselective synthesis , acoustics
Poly(quinoxaline‐2,3‐diyl)s containing ( S )‐3‐octyloxymethyl side chains with low degree of polymerization exhibited M ‐helical conformations in cyclohexane, while the polymers with high low degree of polymerization adopt P ‐helical conformations. This bidirectional screw‐sense induction can be rationalized based on a modified theoretical model, which includes the effect of the terminal groups. Furthermore, the authors also found that triblock copolymers that contain the chiral units either in the terminal groups or in the main chain adopted M ‐ or P ‐helical conformations, respectively.