Synthesis of side group liquid crystal-coil triblock copolymers with cyanobiphenyl moieties and PEG as coil segments by atom-transfer radical polymerization and their thermotropic phase behavior

Xiaohua He; Hailiang Zhang; Xiayu Wang

doi:10.1007/s00289-002-0042-y

Synthesis of side group liquid crystal-coil triblock copolymers with cyanobiphenyl moieties and PEG as coil segments by atom-transfer radical polymerization and their thermotropic phase behavior

Xiaohua He^*
, Hailiang Zhang
, Xiayu Wang

^*Corresponding author for this work

XiangTan University

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

7 Scopus citations

Abstract

A series of side group liquid crystal-coil(SGLC-coil) triblock copolymers with narrow polydispersity was synthesized by atom transfer radical polymerization (ATRP), which was designed to have LC conformation of poly(11-(4′-cyanophenyl-4"-phenoxy)undecyl methacrylate) and coil-conformation of polyethylene glycol (PEG) (Mn=6000) segment. The SGLC block was prepared with a rang of molecular weights from 3.5×10³ to 1.4×10⁴. The macro-initiator PEG6000-Br was synthesized with PEG and 2-Bromo-2-methylpropionyl bromide by reaction of acid bromide. Their characterization was investigated using proton nuclear magnetic resonance (¹H NMR), Fourier Transform Infrared (FT-IR) spectra, gel permeation chromatograph (GPC), differential scanning calorimetry (DSC) and polarized optical microscope (POM). All the block polymers exhibited a smectic A mesophase. The phase transition temperatures of the smectic to isotropic (T_S-T_I) phase increased and the crystallizability of PEG depressed with increasing of the molecular weight of the LC block.

Original language	English
Pages (from-to)	337-344
Number of pages	8
Journal	Polymer Bulletin
Volume	48
Issue number	4-5
DOIs	https://doi.org/10.1007/s00289-002-0042-y
State	Published - 2002
Externally published	Yes

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@article{aca8958ffe814360963439ee02132b69,

title = "Synthesis of side group liquid crystal-coil triblock copolymers with cyanobiphenyl moieties and PEG as coil segments by atom-transfer radical polymerization and their thermotropic phase behavior",

abstract = "A series of side group liquid crystal-coil(SGLC-coil) triblock copolymers with narrow polydispersity was synthesized by atom transfer radical polymerization (ATRP), which was designed to have LC conformation of poly(11-(4′-cyanophenyl-4{"}-phenoxy)undecyl methacrylate) and coil-conformation of polyethylene glycol (PEG) (Mn=6000) segment. The SGLC block was prepared with a rang of molecular weights from 3.5×103 to 1.4×104. The macro-initiator PEG6000-Br was synthesized with PEG and 2-Bromo-2-methylpropionyl bromide by reaction of acid bromide. Their characterization was investigated using proton nuclear magnetic resonance (1H NMR), Fourier Transform Infrared (FT-IR) spectra, gel permeation chromatograph (GPC), differential scanning calorimetry (DSC) and polarized optical microscope (POM). All the block polymers exhibited a smectic A mesophase. The phase transition temperatures of the smectic to isotropic (TS-TI) phase increased and the crystallizability of PEG depressed with increasing of the molecular weight of the LC block.",

author = "Xiaohua He and Hailiang Zhang and Xiayu Wang",

year = "2002",

doi = "10.1007/s00289-002-0042-y",

language = "英语",

volume = "48",

pages = "337--344",

journal = "Polymer Bulletin",

issn = "0170-0839",

publisher = "Springer Verlag",

number = "4-5",

}

TY - JOUR

T1 - Synthesis of side group liquid crystal-coil triblock copolymers with cyanobiphenyl moieties and PEG as coil segments by atom-transfer radical polymerization and their thermotropic phase behavior

AU - He, Xiaohua

AU - Zhang, Hailiang

AU - Wang, Xiayu

PY - 2002

Y1 - 2002

N2 - A series of side group liquid crystal-coil(SGLC-coil) triblock copolymers with narrow polydispersity was synthesized by atom transfer radical polymerization (ATRP), which was designed to have LC conformation of poly(11-(4′-cyanophenyl-4"-phenoxy)undecyl methacrylate) and coil-conformation of polyethylene glycol (PEG) (Mn=6000) segment. The SGLC block was prepared with a rang of molecular weights from 3.5×103 to 1.4×104. The macro-initiator PEG6000-Br was synthesized with PEG and 2-Bromo-2-methylpropionyl bromide by reaction of acid bromide. Their characterization was investigated using proton nuclear magnetic resonance (1H NMR), Fourier Transform Infrared (FT-IR) spectra, gel permeation chromatograph (GPC), differential scanning calorimetry (DSC) and polarized optical microscope (POM). All the block polymers exhibited a smectic A mesophase. The phase transition temperatures of the smectic to isotropic (TS-TI) phase increased and the crystallizability of PEG depressed with increasing of the molecular weight of the LC block.

AB - A series of side group liquid crystal-coil(SGLC-coil) triblock copolymers with narrow polydispersity was synthesized by atom transfer radical polymerization (ATRP), which was designed to have LC conformation of poly(11-(4′-cyanophenyl-4"-phenoxy)undecyl methacrylate) and coil-conformation of polyethylene glycol (PEG) (Mn=6000) segment. The SGLC block was prepared with a rang of molecular weights from 3.5×103 to 1.4×104. The macro-initiator PEG6000-Br was synthesized with PEG and 2-Bromo-2-methylpropionyl bromide by reaction of acid bromide. Their characterization was investigated using proton nuclear magnetic resonance (1H NMR), Fourier Transform Infrared (FT-IR) spectra, gel permeation chromatograph (GPC), differential scanning calorimetry (DSC) and polarized optical microscope (POM). All the block polymers exhibited a smectic A mesophase. The phase transition temperatures of the smectic to isotropic (TS-TI) phase increased and the crystallizability of PEG depressed with increasing of the molecular weight of the LC block.

UR - https://www.scopus.com/pages/publications/0036936917

U2 - 10.1007/s00289-002-0042-y

DO - 10.1007/s00289-002-0042-y

M3 - 文章

AN - SCOPUS:0036936917

SN - 0170-0839

VL - 48

SP - 337

EP - 344

JO - Polymer Bulletin

JF - Polymer Bulletin

IS - 4-5

ER -

Synthesis of side group liquid crystal-coil triblock copolymers with cyanobiphenyl moieties and PEG as coil segments by atom-transfer radical polymerization and their thermotropic phase behavior

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