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Preferred‐handedhelical conformation in organic–inorganic hybrid block copolymers with well‐controlledstereoregularity

Authors :
Kometani, Satoshi
Kato, Tomoki
Manabe, Kei
Seko, Tamio
Chang, Yu‐Ning
Luo, Huai‐Rou
Agata, Yoshihiro
Ohta, Noboru
Hayakawa, Teruaki
Fujii, Syuji
Nakamura, Yoshinobu
Li, Ming‐Chia
Hirai, Tomoyasu
Source :
Journal of Polymer Science; March 2022, Vol. 60 Issue: 5 p766-773, 8p
Publication Year :
2022

Abstract

A novel block copolymer containing polyhedral oligomeric silsesquioxanes (POSS) features a well‐controlled stereoregularity, that is, isotactic polymethacrylate‐functionalized POSS‐b‐polymethyl methacrylate (it‐PMAPOSS‐b‐PMMA), was prepared via controlled‐anionic polymerization. The stereoregularity of each segment in the it‐PMAPOSS‐b‐PMMA is evaluated using nuclear magnetic resonance (NMR) spectroscopy, which reveals an isotactic configuration in both the PMAPOSS and PMMA segments. The secondary structure of it‐PMAPOSS‐b‐PMMA in a mixture with a small chiral dopant is clarified with electronic circular dichroism and vibrational circular dichroism measurements. By adding a chiral dopant, a controlled preferential helical conformation of the unilateral segment in achiral it‐PMAPOSS‐b‐PMMA is achieved.

Details

Language :
English
ISSN :
26424150 and 26424169
Volume :
60
Issue :
5
Database :
Supplemental Index
Journal :
Journal of Polymer Science
Publication Type :
Periodical
Accession number :
ejs59054969
Full Text :
https://doi.org/10.1002/pol.20210761