Preparation and properties of azobenzene-containing amphiphilic miktoarm star polymers

Xiaojuan Liao; Hailiang Zhang; Jianfang Chen; Xiayu Wang

doi:10.1007/s00289-006-0723-z

Preparation and properties of azobenzene-containing amphiphilic miktoarm star polymers

Xiaojuan Liao
, Hailiang Zhang
, Jianfang Chen
, Xiayu Wang^*

^*Corresponding author for this work

XiangTan University

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

14 Scopus citations

Abstract

A series of novel miktoarm star polymers composed of a poly(ethylene oxide) (PEO) and two side-chain liquid crystalline azobenzene-containing polymethacrylate (PEO-(PMMAZO)₂) were prepared using atom transfer radical polymerization (ATRP). Bifunctional macroinitiator PEO-Br₂ was synthesized by condensation reaction in two steps and characterized by ¹H NMR, ¹³C NMR and IR. Kinetic study showed that it was a first order reaction referred to the monomer MMAZO, namely, 6-(4-methoxy-4'-oxy-azobenzene)hexyl methacrylate. The liquid crystalline behaviors of the miktoarm star polymers were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM). They exhibited smectic and nematic mesophases when Mn was beyond 9.4×10³ g/mol. The phase transition temperatures of the smectic and nematic phases increased while the melting temperature of PEO decreased with increasing molecular weight of the LC block. Compared with diblock polymer PEO-PMMAZO, the melting temperature of PEO in miktoarm star polymer decreased more rapidly.

Original language	English
Pages (from-to)	819-828
Number of pages	10
Journal	Polymer Bulletin
Volume	58
Issue number	5-6
DOIs	https://doi.org/10.1007/s00289-006-0723-z
State	Published - May 2007
Externally published	Yes

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@article{44bc81b06c184f8d8603475195276d93,

title = "Preparation and properties of azobenzene-containing amphiphilic miktoarm star polymers",

abstract = "A series of novel miktoarm star polymers composed of a poly(ethylene oxide) (PEO) and two side-chain liquid crystalline azobenzene-containing polymethacrylate (PEO-(PMMAZO)2) were prepared using atom transfer radical polymerization (ATRP). Bifunctional macroinitiator PEO-Br2 was synthesized by condensation reaction in two steps and characterized by 1H NMR, 13C NMR and IR. Kinetic study showed that it was a first order reaction referred to the monomer MMAZO, namely, 6-(4-methoxy-4'-oxy-azobenzene)hexyl methacrylate. The liquid crystalline behaviors of the miktoarm star polymers were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM). They exhibited smectic and nematic mesophases when Mn was beyond 9.4×103 g/mol. The phase transition temperatures of the smectic and nematic phases increased while the melting temperature of PEO decreased with increasing molecular weight of the LC block. Compared with diblock polymer PEO-PMMAZO, the melting temperature of PEO in miktoarm star polymer decreased more rapidly.",

author = "Xiaojuan Liao and Hailiang Zhang and Jianfang Chen and Xiayu Wang",

year = "2007",

month = may,

doi = "10.1007/s00289-006-0723-z",

language = "英语",

volume = "58",

pages = "819--828",

journal = "Polymer Bulletin",

issn = "0170-0839",

publisher = "Springer Verlag",

number = "5-6",

}

TY - JOUR

T1 - Preparation and properties of azobenzene-containing amphiphilic miktoarm star polymers

AU - Liao, Xiaojuan

AU - Zhang, Hailiang

AU - Chen, Jianfang

AU - Wang, Xiayu

PY - 2007/5

Y1 - 2007/5

N2 - A series of novel miktoarm star polymers composed of a poly(ethylene oxide) (PEO) and two side-chain liquid crystalline azobenzene-containing polymethacrylate (PEO-(PMMAZO)2) were prepared using atom transfer radical polymerization (ATRP). Bifunctional macroinitiator PEO-Br2 was synthesized by condensation reaction in two steps and characterized by 1H NMR, 13C NMR and IR. Kinetic study showed that it was a first order reaction referred to the monomer MMAZO, namely, 6-(4-methoxy-4'-oxy-azobenzene)hexyl methacrylate. The liquid crystalline behaviors of the miktoarm star polymers were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM). They exhibited smectic and nematic mesophases when Mn was beyond 9.4×103 g/mol. The phase transition temperatures of the smectic and nematic phases increased while the melting temperature of PEO decreased with increasing molecular weight of the LC block. Compared with diblock polymer PEO-PMMAZO, the melting temperature of PEO in miktoarm star polymer decreased more rapidly.

AB - A series of novel miktoarm star polymers composed of a poly(ethylene oxide) (PEO) and two side-chain liquid crystalline azobenzene-containing polymethacrylate (PEO-(PMMAZO)2) were prepared using atom transfer radical polymerization (ATRP). Bifunctional macroinitiator PEO-Br2 was synthesized by condensation reaction in two steps and characterized by 1H NMR, 13C NMR and IR. Kinetic study showed that it was a first order reaction referred to the monomer MMAZO, namely, 6-(4-methoxy-4'-oxy-azobenzene)hexyl methacrylate. The liquid crystalline behaviors of the miktoarm star polymers were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM). They exhibited smectic and nematic mesophases when Mn was beyond 9.4×103 g/mol. The phase transition temperatures of the smectic and nematic phases increased while the melting temperature of PEO decreased with increasing molecular weight of the LC block. Compared with diblock polymer PEO-PMMAZO, the melting temperature of PEO in miktoarm star polymer decreased more rapidly.

UR - https://www.scopus.com/pages/publications/33947642140

U2 - 10.1007/s00289-006-0723-z

DO - 10.1007/s00289-006-0723-z

M3 - 文章

AN - SCOPUS:33947642140

SN - 0170-0839

VL - 58

SP - 819

EP - 828

JO - Polymer Bulletin

JF - Polymer Bulletin

IS - 5-6

ER -

Preparation and properties of azobenzene-containing amphiphilic miktoarm star polymers

Abstract

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