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Demixing and remixing kinetics of poly(2-isopropyl-2-oxazoline) (PIPOZ) aqueous solutions studied by modulated temperature differential scanning calorimetry

Jun Zhao, Richard Hoogenboom UGent, Guy Van Assche and Bruno Van Mele (2010) MACROMOLECULES. 43(16). p.6853-6860
abstract
The demixing and remixing kinetics of aqueous solutions of poly(2-isopropyl-2-oxazoline) (PIPOZ) with four different chain lengths (number-average molar mass of 3300-13000 g mol-1) is studied by means ofmodulated temperature differential scanning calorimetry(MTDSC) in both nonisothermal and quasiisothermal modes. The nonisothermal measurements show that the aqueous solutions of all four PIPOZ samples follow the lower critical solution temperature (LCST) phase behavior. Both the LCST and the corresponding polymer weight fraction (fw) decreasewith increasingmolarmass: 33.8 +/- 0.1 degrees C at 29.8 wt % for 3300 g mol-1 shifts to 26.2 ( 0.1 degrees C at 19.8 wt % for 13000 g mol-1. This typical type I phase behavior of aqueous solutions of PIPOZ is in contrast to the typical type II phase behavior of poly(N-isopropylacrylamide) (PNIPAM) which has isomeric repeat units. The demixing and remixing kinetics throughout the phase transition is studied by quasi-isothermal heat capacity measurements. Overall, the response for PIPOZ solutions is markedly faster than for PNIPAM solutions.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
poly(2-oxazoline), Responsive polymer, smart material, INDUCED PHASE-SEPARATION, COIL-GLOBULE TRANSITION, PRESSURE PERTURBATION CALORIMETRY, ZERO CRITICAL CONCENTRATIONS, POLYMER-WATER INTERACTION, CHAIN SEGMENT MOBILITY, HIGH MOLAR MASSES, POLY(VINYL METHYL-ETHER), POLYDISPERSE POLYMERS, MOLECULAR-DYNAMICS
journal title
MACROMOLECULES
Macromolecules
volume
43
issue
16
pages
6853 - 6860
Web of Science type
Article
Web of Science id
000280855000041
JCR category
POLYMER SCIENCE
JCR impact factor
4.837 (2010)
JCR rank
5/78 (2010)
JCR quartile
1 (2010)
ISSN
0024-9297
DOI
10.1021/ma1012368
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1025887
handle
http://hdl.handle.net/1854/LU-1025887
date created
2010-08-19 09:31:34
date last changed
2011-07-26 11:38:39
@article{1025887,
  abstract     = {The demixing and remixing kinetics of aqueous solutions of poly(2-isopropyl-2-oxazoline) (PIPOZ) with four different chain lengths (number-average molar mass of 3300-13000 g mol-1) is studied by means ofmodulated temperature differential scanning calorimetry(MTDSC) in both nonisothermal and quasiisothermal modes. The nonisothermal measurements show that the aqueous solutions of all four PIPOZ samples follow the lower critical solution temperature (LCST) phase behavior. Both the LCST and the corresponding polymer weight fraction (fw) decreasewith increasingmolarmass: 33.8 +/- 0.1 degrees C at 29.8 wt \% for 3300 g mol-1 shifts to 26.2 ( 0.1 degrees C at 19.8 wt \% for 13000 g mol-1. This typical type I phase behavior of aqueous solutions of PIPOZ is in contrast to the typical type II phase behavior of poly(N-isopropylacrylamide) (PNIPAM) which has isomeric repeat units. The demixing and remixing kinetics throughout the phase transition is studied by quasi-isothermal heat capacity measurements. Overall, the response for PIPOZ solutions is markedly faster than for PNIPAM solutions.},
  author       = {Zhao, Jun and Hoogenboom, Richard and Van Assche, Guy and Van Mele, Bruno},
  issn         = {0024-9297},
  journal      = {MACROMOLECULES},
  keyword      = {poly(2-oxazoline),Responsive polymer,smart material,INDUCED PHASE-SEPARATION,COIL-GLOBULE TRANSITION,PRESSURE PERTURBATION CALORIMETRY,ZERO CRITICAL CONCENTRATIONS,POLYMER-WATER INTERACTION,CHAIN SEGMENT MOBILITY,HIGH MOLAR MASSES,POLY(VINYL METHYL-ETHER),POLYDISPERSE POLYMERS,MOLECULAR-DYNAMICS},
  language     = {eng},
  number       = {16},
  pages        = {6853--6860},
  title        = {Demixing and remixing kinetics of poly(2-isopropyl-2-oxazoline) (PIPOZ) aqueous solutions studied by modulated temperature differential scanning calorimetry},
  url          = {http://dx.doi.org/10.1021/ma1012368},
  volume       = {43},
  year         = {2010},
}

Chicago
Zhao, Jun, Richard Hoogenboom, Guy Van Assche, and Bruno Van Mele. 2010. “Demixing and Remixing Kinetics of Poly(2-isopropyl-2-oxazoline) (PIPOZ) Aqueous Solutions Studied by Modulated Temperature Differential Scanning Calorimetry.” Macromolecules 43 (16): 6853–6860.
APA
Zhao, J., Hoogenboom, R., Van Assche, G., & Van Mele, B. (2010). Demixing and remixing kinetics of poly(2-isopropyl-2-oxazoline) (PIPOZ) aqueous solutions studied by modulated temperature differential scanning calorimetry. MACROMOLECULES, 43(16), 6853–6860.
Vancouver
1.
Zhao J, Hoogenboom R, Van Assche G, Van Mele B. Demixing and remixing kinetics of poly(2-isopropyl-2-oxazoline) (PIPOZ) aqueous solutions studied by modulated temperature differential scanning calorimetry. MACROMOLECULES. 2010;43(16):6853–60.
MLA
Zhao, Jun, Richard Hoogenboom, Guy Van Assche, et al. “Demixing and Remixing Kinetics of Poly(2-isopropyl-2-oxazoline) (PIPOZ) Aqueous Solutions Studied by Modulated Temperature Differential Scanning Calorimetry.” MACROMOLECULES 43.16 (2010): 6853–6860. Print.