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Thermoresponsive poly(2-oxazoline) block copolymers exhibiting two cloud points: complex multistep assembly behavior

Loan TT Trinh, Hanneke ML Lambermont-Thijs, Ulrich S Schubert, Richard Hoogenboom UGent and Anna-Lena Kjøniksen (2012) MACROMOLECULES. 45(10). p.4337-4345
abstract
Aqueous solutions of poly(2-oxazoline) block copolymers consisting of a 2-ethyl-2-oxazoline block and a block consisting of a random copolymer of 2-ethyl-2-oxazoline and 2-n-propyl-2-oxazoline (PEtOx-block-P(EtOx-stat-PropOx)) have been studied by dynamic light scattering (DLS), static light scattering (SLS), and turbidimetry. Even at temperatures significantly below the lower critical solution temperature (LCST), polymer unimers are found to coexist with a few large aggregates with an open structure. When heated, the systems exhibit an intricate transmittance behavior whereby the samples becomes visually clear again after an initial cloud point and then exhibit a second cloud point at even higher temperatures. The DLS data indicate that the aggregates formed around the first cloud point restructure and fragment into smaller micelle-like structures ascribed to further dehydration of the more hydrophobic PPropOx containing block, causing the samples to become optically clear again. The observed fragmentation is confirmed by the SLS experiments. At even higher temperatures, both blocks become hydrophobic, causing the formation of large, compact aggregates, resulting in a second cloud point.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
RADICAL POLYMERIZATION, AQUEOUS-SOLUTIONS, RESPONSIVE POLYMERS, DIBLOCK COPOLYMERS, MESOGLOBULAR PHASE, DRUG-RELEASE, TEMPERATURE, POLY(N-ISOPROPYLACRYLAMIDE), TRANSITION, DELIVERY
journal title
MACROMOLECULES
Macromolecules
volume
45
issue
10
pages
4337 - 4345
Web of Science type
Article
Web of Science id
000304224700036
JCR category
POLYMER SCIENCE
JCR impact factor
5.521 (2012)
JCR rank
3/82 (2012)
JCR quartile
1 (2012)
ISSN
0024-9297
DOI
10.1021/ma300570j
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2912880
handle
http://hdl.handle.net/1854/LU-2912880
date created
2012-06-20 08:54:07
date last changed
2012-07-05 15:16:29
@article{2912880,
  abstract     = {Aqueous solutions of poly(2-oxazoline) block copolymers consisting of a 2-ethyl-2-oxazoline block and a block consisting of a random copolymer of 2-ethyl-2-oxazoline and 2-n-propyl-2-oxazoline (PEtOx-block-P(EtOx-stat-PropOx)) have been studied by dynamic light scattering (DLS), static light scattering (SLS), and turbidimetry. Even at temperatures significantly below the lower critical solution temperature (LCST), polymer unimers are found to coexist with a few large aggregates with an open structure. When heated, the systems exhibit an intricate transmittance behavior whereby the samples becomes visually clear again after an initial cloud point and then exhibit a second cloud point at even higher temperatures. The DLS data indicate that the aggregates formed around the first cloud point restructure and fragment into smaller micelle-like structures ascribed to further dehydration of the more hydrophobic PPropOx containing block, causing the samples to become optically clear again. The observed fragmentation is confirmed by the SLS experiments. At even higher temperatures, both blocks become hydrophobic, causing the formation of large, compact aggregates, resulting in a second cloud point.},
  author       = {Trinh, Loan TT and Lambermont-Thijs, Hanneke ML and Schubert, Ulrich S and Hoogenboom, Richard and Kj{\o}niksen, Anna-Lena},
  issn         = {0024-9297},
  journal      = {MACROMOLECULES},
  keyword      = {RADICAL POLYMERIZATION,AQUEOUS-SOLUTIONS,RESPONSIVE POLYMERS,DIBLOCK COPOLYMERS,MESOGLOBULAR PHASE,DRUG-RELEASE,TEMPERATURE,POLY(N-ISOPROPYLACRYLAMIDE),TRANSITION,DELIVERY},
  language     = {eng},
  number       = {10},
  pages        = {4337--4345},
  title        = {Thermoresponsive poly(2-oxazoline) block copolymers exhibiting two cloud points: complex multistep assembly behavior},
  url          = {http://dx.doi.org/10.1021/ma300570j},
  volume       = {45},
  year         = {2012},
}

Chicago
Trinh, Loan TT, Hanneke ML Lambermont-Thijs, Ulrich S Schubert, Richard Hoogenboom, and Anna-Lena Kjøniksen. 2012. “Thermoresponsive Poly(2-oxazoline) Block Copolymers Exhibiting Two Cloud Points: Complex Multistep Assembly Behavior.” Macromolecules 45 (10): 4337–4345.
APA
Trinh, L. T., Lambermont-Thijs, H. M., Schubert, U. S., Hoogenboom, R., & Kjøniksen, A.-L. (2012). Thermoresponsive poly(2-oxazoline) block copolymers exhibiting two cloud points: complex multistep assembly behavior. MACROMOLECULES, 45(10), 4337–4345.
Vancouver
1.
Trinh LT, Lambermont-Thijs HM, Schubert US, Hoogenboom R, Kjøniksen A-L. Thermoresponsive poly(2-oxazoline) block copolymers exhibiting two cloud points: complex multistep assembly behavior. MACROMOLECULES. 2012;45(10):4337–45.
MLA
Trinh, Loan TT, Hanneke ML Lambermont-Thijs, Ulrich S Schubert, et al. “Thermoresponsive Poly(2-oxazoline) Block Copolymers Exhibiting Two Cloud Points: Complex Multistep Assembly Behavior.” MACROMOLECULES 45.10 (2012): 4337–4345. Print.