Lower critical ordering transition of poly(ethylene oxide)-block-poly(2- vinylpyridine)

Chao Lin Yeh; Ting Hou; Hsin Lung Chen; Lin Ya Yeh; Fang Chyou Chiu; Alejandro J. Müller; N. Hadjichristidis

doi:10.1021/ma102322w

Lower critical ordering transition of poly(ethylene oxide)-block-poly(2- vinylpyridine)

Chao Lin Yeh, Ting Hou, Hsin Lung Chen^*, Lin Ya Yeh, Fang Chyou Chiu, Alejandro J. Müller, N. Hadjichristidis

^*Corresponding author for this work

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

25 Scopus citations

Abstract

A new diblock copolymer exhibiting the unconventional lower critical ordering transition (LCOT) behavior was investigated. The system is composed of a poly (ethylene oxide) (PEO) and a poly(2-vinylpyridine) (P2VP) block. The PEO-b-P2VP samples were synthesized by sequential anionic polymerization of 2-vinylpyridine and ethylene oxide. The number-average molecular weights (M _n) of both blocks in the symmetric diblock were ca. 40 000, which prescribed the volume fraction of PEO (f_PEO) as 0.49. The M _n of PEO and P2VP blocks in the asymmetric diblock were 20 000 and 100 000, respectively, and the corresponding fPEO was 0.16. The thermally induced phase transition of PEO-b-P2VP was detected by the temperature-dependent SAXS measurement. The intensity of this peak grew with increasing temperature, and a second-order peak was discernible above 160°C, signaling the formation of a microphase-separated lamellar morphology.

Original language	English (US)
Pages (from-to)	440-443
Number of pages	4
Journal	Macromolecules
Volume	44
Issue number	3
DOIs	https://doi.org/10.1021/ma102322w
State	Published - Feb 8 2011
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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@article{e07dcd5d9dab4a4895d7b80458d65924,

title = "Lower critical ordering transition of poly(ethylene oxide)-block-poly(2- vinylpyridine)",

abstract = "A new diblock copolymer exhibiting the unconventional lower critical ordering transition (LCOT) behavior was investigated. The system is composed of a poly (ethylene oxide) (PEO) and a poly(2-vinylpyridine) (P2VP) block. The PEO-b-P2VP samples were synthesized by sequential anionic polymerization of 2-vinylpyridine and ethylene oxide. The number-average molecular weights (M n) of both blocks in the symmetric diblock were ca. 40 000, which prescribed the volume fraction of PEO (fPEO) as 0.49. The M n of PEO and P2VP blocks in the asymmetric diblock were 20 000 and 100 000, respectively, and the corresponding fPEO was 0.16. The thermally induced phase transition of PEO-b-P2VP was detected by the temperature-dependent SAXS measurement. The intensity of this peak grew with increasing temperature, and a second-order peak was discernible above 160°C, signaling the formation of a microphase-separated lamellar morphology.",

author = "Yeh, {Chao Lin} and Ting Hou and Chen, {Hsin Lung} and Yeh, {Lin Ya} and Chiu, {Fang Chyou} and M{\"u}ller, {Alejandro J.} and N. Hadjichristidis",

year = "2011",

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doi = "10.1021/ma102322w",

language = "English (US)",

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journal = "Macromolecules",

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T1 - Lower critical ordering transition of poly(ethylene oxide)-block-poly(2- vinylpyridine)

AU - Yeh, Chao Lin

AU - Hou, Ting

AU - Chen, Hsin Lung

AU - Yeh, Lin Ya

AU - Chiu, Fang Chyou

AU - Müller, Alejandro J.

AU - Hadjichristidis, N.

PY - 2011/2/8

Y1 - 2011/2/8

N2 - A new diblock copolymer exhibiting the unconventional lower critical ordering transition (LCOT) behavior was investigated. The system is composed of a poly (ethylene oxide) (PEO) and a poly(2-vinylpyridine) (P2VP) block. The PEO-b-P2VP samples were synthesized by sequential anionic polymerization of 2-vinylpyridine and ethylene oxide. The number-average molecular weights (M n) of both blocks in the symmetric diblock were ca. 40 000, which prescribed the volume fraction of PEO (fPEO) as 0.49. The M n of PEO and P2VP blocks in the asymmetric diblock were 20 000 and 100 000, respectively, and the corresponding fPEO was 0.16. The thermally induced phase transition of PEO-b-P2VP was detected by the temperature-dependent SAXS measurement. The intensity of this peak grew with increasing temperature, and a second-order peak was discernible above 160°C, signaling the formation of a microphase-separated lamellar morphology.

AB - A new diblock copolymer exhibiting the unconventional lower critical ordering transition (LCOT) behavior was investigated. The system is composed of a poly (ethylene oxide) (PEO) and a poly(2-vinylpyridine) (P2VP) block. The PEO-b-P2VP samples were synthesized by sequential anionic polymerization of 2-vinylpyridine and ethylene oxide. The number-average molecular weights (M n) of both blocks in the symmetric diblock were ca. 40 000, which prescribed the volume fraction of PEO (fPEO) as 0.49. The M n of PEO and P2VP blocks in the asymmetric diblock were 20 000 and 100 000, respectively, and the corresponding fPEO was 0.16. The thermally induced phase transition of PEO-b-P2VP was detected by the temperature-dependent SAXS measurement. The intensity of this peak grew with increasing temperature, and a second-order peak was discernible above 160°C, signaling the formation of a microphase-separated lamellar morphology.

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U2 - 10.1021/ma102322w

DO - 10.1021/ma102322w

M3 - Article

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VL - 44

SP - 440

EP - 443

JO - Macromolecules

JF - Macromolecules

IS - 3

ER -

Lower critical ordering transition of poly(ethylene oxide)-block-poly(2- vinylpyridine)

Abstract

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