Hierarchical Assembly of a Series of Rod-Coil Block Copolymers: Supramolecular LC Phase in Nanoenviroment

Christopher Y. Li; Kishore K. Tenneti; Dong Zhang; Hailiang Zhang; Xinhua Wan; Er Qiang Chen; Qi Feng Zhou; Avila Orta Carlos; Sics Igos; Benjamin S. Hsiao

doi:10.1021/ma0354905

Hierarchical Assembly of a Series of Rod-Coil Block Copolymers: Supramolecular LC Phase in Nanoenviroment

Christopher Y. Li
, Kishore K. Tenneti
, Dong Zhang
, Hailiang Zhang
, Xinhua Wan
, Er Qiang Chen
, Qi Feng Zhou
, Avila Orta Carlos
, Sics Igos
, Benjamin S. Hsiao

Chemistry

Drexel University
Peking University
Stony Brook University

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

108 Scopus citations

Abstract

A series of narrowly distributed rod-coil diblock copolymers, poly(styrene-block-(2,5-bis-[4-methoxyphenyl]oxycarbonyl)styrene) (PS-PMPCS), were synthesized by 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated living free radical polymerization. Differential scanning calorimetry, wide-angle X-ray diffraction, small-angle X-ray scattering, polorized light microscopy, and transmission electron microscopy were used to study the phase structure of this series of rod-coil polymers. It was found that the block copolymers microphase separate into ordered structures at temperatures below ca. 240°C. PMPCS blocks form supramolecular columnar nematic phase (φ _N) within the microphase-separated block copolymers. LC columnar axes were identified to be parallel to the block copolymer lamellar normal. Two layers of LC columns are confined in each LC domain, and the hierarchical structure resembles the "bilayer smectic A" phase observed in small molecular liquid crystals and rod-coil oligomers.

Original language	English
Pages (from-to)	2854-2860
Number of pages	7
Journal	Macromolecules
Volume	37
Issue number	8
DOIs	https://doi.org/10.1021/ma0354905
State	Published - Apr 20 2004

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@article{43456776df564b1b9b455918d4058cba,

title = "Hierarchical Assembly of a Series of Rod-Coil Block Copolymers: Supramolecular LC Phase in Nanoenviroment",

abstract = "A series of narrowly distributed rod-coil diblock copolymers, poly(styrene-block-(2,5-bis-[4-methoxyphenyl]oxycarbonyl)styrene) (PS-PMPCS), were synthesized by 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated living free radical polymerization. Differential scanning calorimetry, wide-angle X-ray diffraction, small-angle X-ray scattering, polorized light microscopy, and transmission electron microscopy were used to study the phase structure of this series of rod-coil polymers. It was found that the block copolymers microphase separate into ordered structures at temperatures below ca. 240°C. PMPCS blocks form supramolecular columnar nematic phase (φ N) within the microphase-separated block copolymers. LC columnar axes were identified to be parallel to the block copolymer lamellar normal. Two layers of LC columns are confined in each LC domain, and the hierarchical structure resembles the {"}bilayer smectic A{"} phase observed in small molecular liquid crystals and rod-coil oligomers.",

author = "Li, \{Christopher Y.\} and Tenneti, \{Kishore K.\} and Dong Zhang and Hailiang Zhang and Xinhua Wan and Chen, \{Er Qiang\} and Zhou, \{Qi Feng\} and Carlos, \{Avila Orta\} and Sics Igos and Hsiao, \{Benjamin S.\}",

year = "2004",

month = apr,

day = "20",

doi = "10.1021/ma0354905",

language = "English",

volume = "37",

pages = "2854--2860",

journal = "Macromolecules",

issn = "0024-9297",

number = "8",

}

TY - JOUR

T1 - Hierarchical Assembly of a Series of Rod-Coil Block Copolymers

T2 - Supramolecular LC Phase in Nanoenviroment

AU - Li, Christopher Y.

AU - Tenneti, Kishore K.

AU - Zhang, Dong

AU - Zhang, Hailiang

AU - Wan, Xinhua

AU - Chen, Er Qiang

AU - Zhou, Qi Feng

AU - Carlos, Avila Orta

AU - Igos, Sics

AU - Hsiao, Benjamin S.

PY - 2004/4/20

Y1 - 2004/4/20

N2 - A series of narrowly distributed rod-coil diblock copolymers, poly(styrene-block-(2,5-bis-[4-methoxyphenyl]oxycarbonyl)styrene) (PS-PMPCS), were synthesized by 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated living free radical polymerization. Differential scanning calorimetry, wide-angle X-ray diffraction, small-angle X-ray scattering, polorized light microscopy, and transmission electron microscopy were used to study the phase structure of this series of rod-coil polymers. It was found that the block copolymers microphase separate into ordered structures at temperatures below ca. 240°C. PMPCS blocks form supramolecular columnar nematic phase (φ N) within the microphase-separated block copolymers. LC columnar axes were identified to be parallel to the block copolymer lamellar normal. Two layers of LC columns are confined in each LC domain, and the hierarchical structure resembles the "bilayer smectic A" phase observed in small molecular liquid crystals and rod-coil oligomers.

AB - A series of narrowly distributed rod-coil diblock copolymers, poly(styrene-block-(2,5-bis-[4-methoxyphenyl]oxycarbonyl)styrene) (PS-PMPCS), were synthesized by 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated living free radical polymerization. Differential scanning calorimetry, wide-angle X-ray diffraction, small-angle X-ray scattering, polorized light microscopy, and transmission electron microscopy were used to study the phase structure of this series of rod-coil polymers. It was found that the block copolymers microphase separate into ordered structures at temperatures below ca. 240°C. PMPCS blocks form supramolecular columnar nematic phase (φ N) within the microphase-separated block copolymers. LC columnar axes were identified to be parallel to the block copolymer lamellar normal. Two layers of LC columns are confined in each LC domain, and the hierarchical structure resembles the "bilayer smectic A" phase observed in small molecular liquid crystals and rod-coil oligomers.

UR - https://www.scopus.com/pages/publications/2342643484

U2 - 10.1021/ma0354905

DO - 10.1021/ma0354905

M3 - Article

AN - SCOPUS:2342643484

SN - 0024-9297

VL - 37

SP - 2854

EP - 2860

JO - Macromolecules

JF - Macromolecules

IS - 8

ER -

Hierarchical Assembly of a Series of Rod-Coil Block Copolymers: Supramolecular LC Phase in Nanoenviroment

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