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Formation of internally nanostructured triblock copolymer particles

Bryskhe, Karin LU ; Schillén, Karin LU ; Olsson, Ulf LU ; Yaghmur, A and Glatter, O (2005) In Langmuir 21(19). p.8597-8600
Abstract
Particles with an internal structure have been found in dilute water solutions of a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), which has short hydrophilic PEO endblocks compared to the central hydrophobic PPO block (EO5PO68EO5, L121). The properties of the block copolymer particles (i.e., their structure, size, and time stability) have been investigated using cryogenic transmission electron microscopy (cryo-TEM) in combination with dynamic light scattering (DLS) and turbidity measurements. The particles were formed in dilute solutions by quenching the temperature to temperatures where the reversed hexagonal phase is in equilibrium with a solution of unaggregated L121 copolymers (L-1). From the DLS... (More)
Particles with an internal structure have been found in dilute water solutions of a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), which has short hydrophilic PEO endblocks compared to the central hydrophobic PPO block (EO5PO68EO5, L121). The properties of the block copolymer particles (i.e., their structure, size, and time stability) have been investigated using cryogenic transmission electron microscopy (cryo-TEM) in combination with dynamic light scattering (DLS) and turbidity measurements. The particles were formed in dilute solutions by quenching the temperature to temperatures where the reversed hexagonal phase is in equilibrium with a solution of unaggregated L121 copolymers (L-1). From the DLS measurements, a mean hydrodynamic radius of 158 mn was extracted. The time-scan turbidity measurements were found to be unchanged for about 46 h. At higher copolymer concentrations, a reversed hexagonal phase (H-2) exists in the L121/water system. SAXS was used to investigate the internal structure of the dispersed L121-based particles containing 15 wt % L121. It was found that the internal structure transforms from H2 to an inverse micellar system (L-2) as the temperature increases from 37 to 70 degrees C. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
21
issue
19
pages
8597 - 8600
publisher
The American Chemical Society
external identifiers
  • wos:000231789800009
  • scopus:25844496232
ISSN
0743-7463
DOI
10.1021/la051157d
language
English
LU publication?
yes
id
0647a475-b456-4327-b0b5-9cf5b027afd2 (old id 157228)
date added to LUP
2007-07-11 08:24:59
date last changed
2017-01-01 04:47:34
@article{0647a475-b456-4327-b0b5-9cf5b027afd2,
  abstract     = {Particles with an internal structure have been found in dilute water solutions of a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), which has short hydrophilic PEO endblocks compared to the central hydrophobic PPO block (EO5PO68EO5, L121). The properties of the block copolymer particles (i.e., their structure, size, and time stability) have been investigated using cryogenic transmission electron microscopy (cryo-TEM) in combination with dynamic light scattering (DLS) and turbidity measurements. The particles were formed in dilute solutions by quenching the temperature to temperatures where the reversed hexagonal phase is in equilibrium with a solution of unaggregated L121 copolymers (L-1). From the DLS measurements, a mean hydrodynamic radius of 158 mn was extracted. The time-scan turbidity measurements were found to be unchanged for about 46 h. At higher copolymer concentrations, a reversed hexagonal phase (H-2) exists in the L121/water system. SAXS was used to investigate the internal structure of the dispersed L121-based particles containing 15 wt % L121. It was found that the internal structure transforms from H2 to an inverse micellar system (L-2) as the temperature increases from 37 to 70 degrees C.},
  author       = {Bryskhe, Karin and Schillén, Karin and Olsson, Ulf and Yaghmur, A and Glatter, O},
  issn         = {0743-7463},
  language     = {eng},
  number       = {19},
  pages        = {8597--8600},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Formation of internally nanostructured triblock copolymer particles},
  url          = {http://dx.doi.org/10.1021/la051157d},
  volume       = {21},
  year         = {2005},
}