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; Lindman, Björn; Alfredsson, Viveka

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

Mark

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

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)
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)

Please use this url to cite or link to this publication: https://lup.lub.lu.se/record/122045

author

Kipkemboi, P ; Khan, Ali ^LU ; Lindman, Björn ^LU and Alfredsson, Viveka ^LU

organization

Physical Chemistry

publishing date

2003

type

Contribution to journal

publication status

published

subject

Physical Chemistry

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

2016-04-01 17:09:57

date last changed

2022-01-29 00:50:02

@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}},
  doi          = {{10.1139/V03-102}},
  volume       = {{81}},
  year         = {{2003}},
}

Lund University Publications

LUND UNIVERSITY LIBRARIES

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