Advanced

Phase behaviour and structure of amphiphilic poly(ethylene oxide)-poly(propylene oxide) triblock copolymers ((EO)(4)(PO)(59)(EO)(4) and (EO)(17)(PO)(59)(EO)(17)) in ternary mixtures with water and xylene

Kipkemboi, P; Khan, Ali LU ; Lindman, Björn LU and Alfredsson, Viveka LU (2003) In Canadian Journal of Chemistry 81(8). p.897-908
Abstract (Swedish)
Abstract in French

Opérant à 25 °C, on a étudié le comportement de la phase ternaire isotherme et de la structure des systèmes copolymère–eau–xylène amphiphiles de deux copolymères à trois blocs de poly(oxyde d'éthylène)–poly(oxyde de propylène) (PEO–PPO), (EO)4(PO)59(EO)4 et (EO)17(PO)59(EO)17. On a identifié les barrières des phases par RMN du 2H et par inspection sous de la lumière polarisée. On a déterminé la microstructure et les échelles de longueur dans des phases de cristaux liquides lyotropes et on les a caractérisées par diffraction des rayons X à angle faible. Les quantités et les proportions relatives de solvants choisis peuvent moduler les microstructures qui en résultent, même si la séquence de phase qui est... (More)
Abstract in French

Opérant à 25 °C, on a étudié le comportement de la phase ternaire isotherme et de la structure des systèmes copolymère–eau–xylène amphiphiles de deux copolymères à trois blocs de poly(oxyde d'éthylène)–poly(oxyde de propylène) (PEO–PPO), (EO)4(PO)59(EO)4 et (EO)17(PO)59(EO)17. On a identifié les barrières des phases par RMN du 2H et par inspection sous de la lumière polarisée. On a déterminé la microstructure et les échelles de longueur dans des phases de cristaux liquides lyotropes et on les a caractérisées par diffraction des rayons X à angle faible. Les quantités et les proportions relatives de solvants choisis peuvent moduler les microstructures qui en résultent, même si la séquence de phase qui est observée dépend du rapport relatif des blocs PEO–PPO. Une variété de phases de cristaux liquides lyotropes (LLC) sont thermodynamiquement stables dans le système ave le copolymère (EO)17(PO)59(EO)17 de morphologie tant normale (huile dans l'eau) qu'inversée (eau dans l'huile). Toutefois, le contenu hydrophobe élevé du copolymère (EO)4(PO)59(EO)4 favorise les structures LLC inversées avec de faibles courbures interfaciales. Il n'y a pas de phases LLC normales qui se forment dans ce système. (Less)
Abstract
The isothermal ternary phase behaviour and structure of amphiphilic copolymer-water-xylene systems was investigated for two poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) triblo

k copolymers, (EO)(4)(PO)(59)(EO)(4) and (EO)(17)(PO)(59)(EO)(17), at 25degreesC. The phase boundaries were identified using H-2 NMR and inspection under polarized light. The microstructure and structural length scales in the lyotropic liquid crystalline phases were determined and characterized by small-angle X-ray scattering. The amounts and relative proportions of the selective solvents can modulate the resulting microstructures, although the phase sequence observed depends on the relative PEO-PPO block ratio. A variety of lyotropic liquid... (More)
The isothermal ternary phase behaviour and structure of amphiphilic copolymer-water-xylene systems was investigated for two poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) triblo

k copolymers, (EO)(4)(PO)(59)(EO)(4) and (EO)(17)(PO)(59)(EO)(17), at 25degreesC. The phase boundaries were identified using H-2 NMR and inspection under polarized light. The microstructure and structural length scales in the lyotropic liquid crystalline phases were determined and characterized by small-angle X-ray scattering. The amounts and relative proportions of the selective solvents can modulate the resulting microstructures, although the phase sequence observed depends on the relative PEO-PPO block ratio. A variety of lyotropic liquid crystalline (LLC) phases are thermodynamically stable in the system with copolymer (EO)(17)(PO)(59)(EO)(17), both of the normal ("oil-in-water") and of the reverse ("water-in-oil") morphology. The high hydrophobic content of copolymer (EO)(4)(PO)(59)(EO)(4), however, favours reverse LLC structures with low interfacial curvature. No normal LLC phases are formed by this system. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Canadian Journal of Chemistry
volume
81
issue
8
pages
897 - 908
publisher
NRC Research Press
external identifiers
  • wos:000185319000003
  • scopus:0142106299
ISSN
0008-4042
DOI
10.1139/V03-102
language
English
LU publication?
yes
id
9395fe18-5c5e-4d55-a64a-341340039fe5 (old id 122045)
date added to LUP
2007-07-11 14:30:44
date last changed
2018-05-29 11:19:35
@article{9395fe18-5c5e-4d55-a64a-341340039fe5,
  abstract     = {The isothermal ternary phase behaviour and structure of amphiphilic copolymer-water-xylene systems was investigated for two poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) triblo<br/><br>
k copolymers, (EO)(4)(PO)(59)(EO)(4) and (EO)(17)(PO)(59)(EO)(17), at 25degreesC. The phase boundaries were identified using H-2 NMR and inspection under polarized light. The microstructure and structural length scales in the lyotropic liquid crystalline phases were determined and characterized by small-angle X-ray scattering. The amounts and relative proportions of the selective solvents can modulate the resulting microstructures, although the phase sequence observed depends on the relative PEO-PPO block ratio. A variety of lyotropic liquid crystalline (LLC) phases are thermodynamically stable in the system with copolymer (EO)(17)(PO)(59)(EO)(17), both of the normal ("oil-in-water") and of the reverse ("water-in-oil") morphology. The high hydrophobic content of copolymer (EO)(4)(PO)(59)(EO)(4), however, favours reverse LLC structures with low interfacial curvature. No normal LLC phases are formed by this system.},
  author       = {Kipkemboi, P and Khan, Ali and Lindman, Björn and Alfredsson, Viveka},
  issn         = {0008-4042},
  language     = {eng},
  number       = {8},
  pages        = {897--908},
  publisher    = {NRC Research Press},
  series       = {Canadian Journal of Chemistry},
  title        = {Phase behaviour and structure of amphiphilic poly(ethylene oxide)-poly(propylene oxide) triblock copolymers ((EO)(4)(PO)(59)(EO)(4) and (EO)(17)(PO)(59)(EO)(17)) in ternary mixtures with water and xylene},
  url          = {http://dx.doi.org/10.1139/V03-102},
  volume       = {81},
  year         = {2003},
}