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Synthesis of Thermo-Responsive Fluorinated Star-Shaped Polymers by Living Cationic Polymerization

Published online by Cambridge University Press:  01 February 2011

Tomomi Irita ,
Katsuhiko Imoto ,
Takabumi Nagai  and
Sadahito Aoshima
Tomomi Irita*
Affiliation:
Chemical R&D Center, Daikin Industries, Ltd., 1-1 Nishi Hitotsuya, Settsu-shi, Osaka, 566-8585, Japan
Katsuhiko Imoto
Affiliation:
Chemical R&D Center, Daikin Industries, Ltd., 1-1 Nishi Hitotsuya, Settsu-shi, Osaka, 566-8585, Japan
Takabumi Nagai
Affiliation:
Chemical R&D Center, Daikin Industries, Ltd., 1-1 Nishi Hitotsuya, Settsu-shi, Osaka, 566-8585, Japan
Sadahito Aoshima
Affiliation:
Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
*
*e-mail address [email protected]
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Abstract

Well-controlled fluorinated star-shaped polymers with oxyethylene units were designed and synthesized by living cationic polymerization. These fluorinated star-shaped polymers were prepared using successive fluorinated initiators to generate fluorinated, end-functionalized and hydrophilic segments with oxyethylene. Poly(vinyl ether)s with oxyethylene units are known to be thermo-responsive polymers that exhibit a lower critical solution temperature (LCST) in aqueous solutions. These novel fluorine-containing star-shaped polymers with oxyethylene were also thermo-responsive, as expected. In addition, the hetero-fluorinated star-shaped polymers with oxyethylene segments and different fluorine compositions were synthesized with various bifunctional initiators by living cationic polymerization having narrow molecular weight distributions (Mw/Mn=1.23−1.29) and contained very little, if any, presence of the linear homopolymer precursor, as evidenced by GPC. The LCST of this polymer depended on the end group fluorine composition and significant changes in cloud points were observed in water, as confirmed by static light scattering (SLS) measurements. As an example, aqueous solutions the star-shaped polymers without fluorine terminal groups showed no cloud point below up to 60 ºC in aqueous solution. After the fluoro-functionality was incorporated into the terminal groups, the cloud point of the aqueous solutions decreased to almost 20 ºC.

Keywords

polymerizationchemical synthesisnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1312: Symposium HH/II/JJ – Polymer-Based Materials and Composites—Synthesis, Assembly and Applications , 2011 , mrsf10-1312-jj05-19
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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