Surface segregation of chain ends in α,ω-fluoroalkyl-terminated polystyrenes films

Keiji Tanaka, Daisuke Kawaguchi, Yasuyuki Yokoe, Tisato Kajiyama, Atsushi Takahara, Seiji Tasaki

研究成果: ジャーナルへの寄稿記事

36 引用 (Scopus)

抄録

α,ω-Fluoroalkyl-terminated polystyrenes (α,ω-PS(Rf)2) with various molecular weights were synthesized by an anionic polymerization. Then, chain end distribution in the surface region of the α,ω-PS(Rf)2 films was studied by angular-dependent X-ray photoelectron spectroscopy in conjunction with neutron reflectivity. The α,ω-PS(Rf)2 films annealed under vacuum exhibited surface localization of chain ends. Since the fluoroalkyl chain ends possess a lower surface free energy compared with the main chain part, they energetically prefer to partition to the surface. The extent to which the chain ends were segregated at the surface was examined as a function of molecular weight. Also, it was presented how surface orientation of the fluoroalkyl end groups was dependent on molecular weight. On the other hand, no segregation of the chain ends was observed at the surface of the α,ω-PS(Rf)2 film annealed in boiled water. This is because the chain ends with a lower surface free energy tend to stay away from the higher energy medium of the boiled water. This result reveals that the surface concentration of chain ends can be regulated by selecting an appropriate annealing condition based on surface thermodynamics.

元の言語英語
ページ(範囲)4171-4177
ページ数7
ジャーナルpolymer
44
発行部数15
DOI
出版物ステータス出版済み - 6 27 2003

Fingerprint

Surface segregation
Polystyrenes
Molecular weight
Free energy
Anionic polymerization
Water
Neutrons
X ray photoelectron spectroscopy
Thermodynamics
Vacuum
Annealing

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

これを引用

Surface segregation of chain ends in α,ω-fluoroalkyl-terminated polystyrenes films. / Tanaka, Keiji; Kawaguchi, Daisuke; Yokoe, Yasuyuki; Kajiyama, Tisato; Takahara, Atsushi; Tasaki, Seiji.

:: polymer, 巻 44, 番号 15, 27.06.2003, p. 4171-4177.

研究成果: ジャーナルへの寄稿記事

Tanaka, Keiji ; Kawaguchi, Daisuke ; Yokoe, Yasuyuki ; Kajiyama, Tisato ; Takahara, Atsushi ; Tasaki, Seiji. / Surface segregation of chain ends in α,ω-fluoroalkyl-terminated polystyrenes films. :: polymer. 2003 ; 巻 44, 番号 15. pp. 4171-4177.
@article{1f057e2fe97f4d1f812cfea26a75e6cd,
title = "Surface segregation of chain ends in α,ω-fluoroalkyl-terminated polystyrenes films",
abstract = "α,ω-Fluoroalkyl-terminated polystyrenes (α,ω-PS(Rf)2) with various molecular weights were synthesized by an anionic polymerization. Then, chain end distribution in the surface region of the α,ω-PS(Rf)2 films was studied by angular-dependent X-ray photoelectron spectroscopy in conjunction with neutron reflectivity. The α,ω-PS(Rf)2 films annealed under vacuum exhibited surface localization of chain ends. Since the fluoroalkyl chain ends possess a lower surface free energy compared with the main chain part, they energetically prefer to partition to the surface. The extent to which the chain ends were segregated at the surface was examined as a function of molecular weight. Also, it was presented how surface orientation of the fluoroalkyl end groups was dependent on molecular weight. On the other hand, no segregation of the chain ends was observed at the surface of the α,ω-PS(Rf)2 film annealed in boiled water. This is because the chain ends with a lower surface free energy tend to stay away from the higher energy medium of the boiled water. This result reveals that the surface concentration of chain ends can be regulated by selecting an appropriate annealing condition based on surface thermodynamics.",
author = "Keiji Tanaka and Daisuke Kawaguchi and Yasuyuki Yokoe and Tisato Kajiyama and Atsushi Takahara and Seiji Tasaki",
year = "2003",
month = "6",
day = "27",
doi = "10.1016/S0032-3861(03)00391-4",
language = "English",
volume = "44",
pages = "4171--4177",
journal = "Polymer",
issn = "0032-3861",
publisher = "Elsevier BV",
number = "15",

}

TY - JOUR

T1 - Surface segregation of chain ends in α,ω-fluoroalkyl-terminated polystyrenes films

AU - Tanaka, Keiji

AU - Kawaguchi, Daisuke

AU - Yokoe, Yasuyuki

AU - Kajiyama, Tisato

AU - Takahara, Atsushi

AU - Tasaki, Seiji

PY - 2003/6/27

Y1 - 2003/6/27

N2 - α,ω-Fluoroalkyl-terminated polystyrenes (α,ω-PS(Rf)2) with various molecular weights were synthesized by an anionic polymerization. Then, chain end distribution in the surface region of the α,ω-PS(Rf)2 films was studied by angular-dependent X-ray photoelectron spectroscopy in conjunction with neutron reflectivity. The α,ω-PS(Rf)2 films annealed under vacuum exhibited surface localization of chain ends. Since the fluoroalkyl chain ends possess a lower surface free energy compared with the main chain part, they energetically prefer to partition to the surface. The extent to which the chain ends were segregated at the surface was examined as a function of molecular weight. Also, it was presented how surface orientation of the fluoroalkyl end groups was dependent on molecular weight. On the other hand, no segregation of the chain ends was observed at the surface of the α,ω-PS(Rf)2 film annealed in boiled water. This is because the chain ends with a lower surface free energy tend to stay away from the higher energy medium of the boiled water. This result reveals that the surface concentration of chain ends can be regulated by selecting an appropriate annealing condition based on surface thermodynamics.

AB - α,ω-Fluoroalkyl-terminated polystyrenes (α,ω-PS(Rf)2) with various molecular weights were synthesized by an anionic polymerization. Then, chain end distribution in the surface region of the α,ω-PS(Rf)2 films was studied by angular-dependent X-ray photoelectron spectroscopy in conjunction with neutron reflectivity. The α,ω-PS(Rf)2 films annealed under vacuum exhibited surface localization of chain ends. Since the fluoroalkyl chain ends possess a lower surface free energy compared with the main chain part, they energetically prefer to partition to the surface. The extent to which the chain ends were segregated at the surface was examined as a function of molecular weight. Also, it was presented how surface orientation of the fluoroalkyl end groups was dependent on molecular weight. On the other hand, no segregation of the chain ends was observed at the surface of the α,ω-PS(Rf)2 film annealed in boiled water. This is because the chain ends with a lower surface free energy tend to stay away from the higher energy medium of the boiled water. This result reveals that the surface concentration of chain ends can be regulated by selecting an appropriate annealing condition based on surface thermodynamics.

UR - http://www.scopus.com/inward/record.url?scp=0037594132&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037594132&partnerID=8YFLogxK

U2 - 10.1016/S0032-3861(03)00391-4

DO - 10.1016/S0032-3861(03)00391-4

M3 - Article

AN - SCOPUS:0037594132

VL - 44

SP - 4171

EP - 4177

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 15

ER -