Formation of helical phases in achiral block copolymers by simple addition of small chiral additives

Li Yao; Xuemin Lu; Shuangshuang Chen; James J. Watkins

doi:10.1021/ma501714g

Formation of helical phases in achiral block copolymers by simple addition of small chiral additives

Li Yao, Xuemin Lu, Shuangshuang Chen, James J. Watkins

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

Helical superstructures were induced in poly(ethylene oxide)-b-poly(tert-butyl acrylate) (PEO-b-PtBA) achiral diblock copolymers (BCPs) through the simple addition of pure enantiomers of tartaric acid. Hydrogen bond interactions between tartaric acid and poly(ethylene oxide) (PEO) block not only enhance the phase segregation strength of the PEO-based block copolymer but also transfer the chiral information from the additive into the achiral backbone to induce the conformational chirality. The helical phase was formed after thermal annealing with a pitch of ∼25 nm and confirmed by transmission electron microscopy (TEM) and TEM tomography. The handedness of helices can be easily selected by choice of the corresponding enantioisomer of tartaric acid.

Original language	English (US)
Pages (from-to)	6547-6553
Number of pages	7
Journal	Macromolecules
Volume	47
Issue number	19
DOIs	https://doi.org/10.1021/ma501714g
State	Published - Oct 14 2014

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© 2014 American Chemical Society.

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abstract = "Helical superstructures were induced in poly(ethylene oxide)-b-poly(tert-butyl acrylate) (PEO-b-PtBA) achiral diblock copolymers (BCPs) through the simple addition of pure enantiomers of tartaric acid. Hydrogen bond interactions between tartaric acid and poly(ethylene oxide) (PEO) block not only enhance the phase segregation strength of the PEO-based block copolymer but also transfer the chiral information from the additive into the achiral backbone to induce the conformational chirality. The helical phase was formed after thermal annealing with a pitch of ∼25 nm and confirmed by transmission electron microscopy (TEM) and TEM tomography. The handedness of helices can be easily selected by choice of the corresponding enantioisomer of tartaric acid.",

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T1 - Formation of helical phases in achiral block copolymers by simple addition of small chiral additives

AU - Yao, Li

AU - Lu, Xuemin

AU - Chen, Shuangshuang

AU - Watkins, James J.

PY - 2014/10/14

Y1 - 2014/10/14

N2 - Helical superstructures were induced in poly(ethylene oxide)-b-poly(tert-butyl acrylate) (PEO-b-PtBA) achiral diblock copolymers (BCPs) through the simple addition of pure enantiomers of tartaric acid. Hydrogen bond interactions between tartaric acid and poly(ethylene oxide) (PEO) block not only enhance the phase segregation strength of the PEO-based block copolymer but also transfer the chiral information from the additive into the achiral backbone to induce the conformational chirality. The helical phase was formed after thermal annealing with a pitch of ∼25 nm and confirmed by transmission electron microscopy (TEM) and TEM tomography. The handedness of helices can be easily selected by choice of the corresponding enantioisomer of tartaric acid.

AB - Helical superstructures were induced in poly(ethylene oxide)-b-poly(tert-butyl acrylate) (PEO-b-PtBA) achiral diblock copolymers (BCPs) through the simple addition of pure enantiomers of tartaric acid. Hydrogen bond interactions between tartaric acid and poly(ethylene oxide) (PEO) block not only enhance the phase segregation strength of the PEO-based block copolymer but also transfer the chiral information from the additive into the achiral backbone to induce the conformational chirality. The helical phase was formed after thermal annealing with a pitch of ∼25 nm and confirmed by transmission electron microscopy (TEM) and TEM tomography. The handedness of helices can be easily selected by choice of the corresponding enantioisomer of tartaric acid.

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Formation of helical phases in achiral block copolymers by simple addition of small chiral additives

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