Effect of chain end group hydrophobicity on surface aggregation structure of poly(styrene-block-4-vinylpyridine) symmetric diblock copolymer films

Xiqun Jiang, Keiji Tanaka, Atsushi Takahara, Tisato Kajiyama

研究成果: ジャーナルへの寄稿記事

14 引用 (Scopus)

抄録

Proton-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-H) and 3,3,3-trifluoropropyldimethylsilane-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-C 2 C F ) symmetric diblock copolymers were synthesized by a living anionic polymerization. Differential scanning calorimetry (DSC) measurements revealed that both diblock copolymers were in a microphase-separated state in the bulk. The results of X-ray photoelectron spectroscopy (XPS) measurements revealed that in the case of the P(St-b-4VP)-H film, the surface weight fraction of poly(4-vinylpyridine) (P4VP) decreased drastically on annealing at 432 K for 90 h in order to minimize the magnitude of the free energy at the air-polymer interface, whereas in the case of the P(St-b-4VP)-C 2 C F film, the surface P4VP weight fraction was almost the same as the bulk value even after annealing at 423 K for 90 h. Also, scanning force microscopy observations (SFM) were in good agreement with the XPS results. These results clearly indicate that the surface molecular aggregation state of the hydrophobic-hydrophilic diblock copolymer film can be controlled by the hydrophobicity of the chain end groups.

元の言語英語
ページ(範囲)2615-2620
ページ数6
ジャーナルpolymer
39
発行部数12
DOI
出版物ステータス出版済み - 1 1 1998

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Styrene
Hydrophobicity
Block copolymers
Agglomeration
Polystyrenes
X ray photoelectron spectroscopy
Annealing
Living polymerization
Anionic polymerization
Free energy
Protons
Differential scanning calorimetry
Atomic force microscopy
Polymers
Air
4-vinylpyridine
polystyrene-block-poly(4-vinylpyridine)
poly(4-vinylpyridine)

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

これを引用

Effect of chain end group hydrophobicity on surface aggregation structure of poly(styrene-block-4-vinylpyridine) symmetric diblock copolymer films. / Jiang, Xiqun; Tanaka, Keiji; Takahara, Atsushi; Kajiyama, Tisato.

:: polymer, 巻 39, 番号 12, 01.01.1998, p. 2615-2620.

研究成果: ジャーナルへの寄稿記事

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abstract = "Proton-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-H) and 3,3,3-trifluoropropyldimethylsilane-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-C 2 C F ) symmetric diblock copolymers were synthesized by a living anionic polymerization. Differential scanning calorimetry (DSC) measurements revealed that both diblock copolymers were in a microphase-separated state in the bulk. The results of X-ray photoelectron spectroscopy (XPS) measurements revealed that in the case of the P(St-b-4VP)-H film, the surface weight fraction of poly(4-vinylpyridine) (P4VP) decreased drastically on annealing at 432 K for 90 h in order to minimize the magnitude of the free energy at the air-polymer interface, whereas in the case of the P(St-b-4VP)-C 2 C F film, the surface P4VP weight fraction was almost the same as the bulk value even after annealing at 423 K for 90 h. Also, scanning force microscopy observations (SFM) were in good agreement with the XPS results. These results clearly indicate that the surface molecular aggregation state of the hydrophobic-hydrophilic diblock copolymer film can be controlled by the hydrophobicity of the chain end groups.",
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AU - Kajiyama, Tisato

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N2 - Proton-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-H) and 3,3,3-trifluoropropyldimethylsilane-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-C 2 C F ) symmetric diblock copolymers were synthesized by a living anionic polymerization. Differential scanning calorimetry (DSC) measurements revealed that both diblock copolymers were in a microphase-separated state in the bulk. The results of X-ray photoelectron spectroscopy (XPS) measurements revealed that in the case of the P(St-b-4VP)-H film, the surface weight fraction of poly(4-vinylpyridine) (P4VP) decreased drastically on annealing at 432 K for 90 h in order to minimize the magnitude of the free energy at the air-polymer interface, whereas in the case of the P(St-b-4VP)-C 2 C F film, the surface P4VP weight fraction was almost the same as the bulk value even after annealing at 423 K for 90 h. Also, scanning force microscopy observations (SFM) were in good agreement with the XPS results. These results clearly indicate that the surface molecular aggregation state of the hydrophobic-hydrophilic diblock copolymer film can be controlled by the hydrophobicity of the chain end groups.

AB - Proton-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-H) and 3,3,3-trifluoropropyldimethylsilane-terminated polystyrene-block-poly(4-vinylpyridine) (P(St-b-4VP)-C 2 C F ) symmetric diblock copolymers were synthesized by a living anionic polymerization. Differential scanning calorimetry (DSC) measurements revealed that both diblock copolymers were in a microphase-separated state in the bulk. The results of X-ray photoelectron spectroscopy (XPS) measurements revealed that in the case of the P(St-b-4VP)-H film, the surface weight fraction of poly(4-vinylpyridine) (P4VP) decreased drastically on annealing at 432 K for 90 h in order to minimize the magnitude of the free energy at the air-polymer interface, whereas in the case of the P(St-b-4VP)-C 2 C F film, the surface P4VP weight fraction was almost the same as the bulk value even after annealing at 423 K for 90 h. Also, scanning force microscopy observations (SFM) were in good agreement with the XPS results. These results clearly indicate that the surface molecular aggregation state of the hydrophobic-hydrophilic diblock copolymer film can be controlled by the hydrophobicity of the chain end groups.

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