Abstract
Star polymers with a hydrophobic cholane core and four poly(ethylene glycol) (PEG) arms, CA(EGn)4, have been synthesized by anionic polymerization. Pulsed-gradient spin-echo NMR spectroscopy was used to study the diffusion behavior of the star polymers, ranging from 1000 to 10,000g/mol, in aqueous solutions and gels of poly(vinyl alcohol) (PVA) at 23°C. The star polymers have a lower self-diffusion coefficient than linear PEGs at equivalent hydrodynamic radius. In water alone, the star polymers and their linear homologues have a similar diffusion behavior in the dilute regime, as demonstrated by the similar concentration dependence of the self-diffusion coefficients. In the semidilute regime, the star polymers tend to aggregate due to their amphiphilic properties, resulting in lower self-diffusion coefficients than those of linear PEGs. 1H NMR T1 measurements at 10-70°C revealed that the PEG arms of the star polymers are more mobile than the core, suggesting the star polymers in solution have a conformation similar to that of poly(propylene imine) dendrimers.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2345-2350 |
| Number of pages | 6 |
| Journal | Polymer |
| Volume | 51 |
| Issue number | 11 |
| DOIs | |
| State | Published - May 2010 |
| Externally published | Yes |
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Keywords
- Diffusion
- NMR spectroscopy
- Star polymers
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
Cite this
Effect of molecular architecture on the self-diffusion of polymers in aqueous systems : A comparison of linear, star, and dendritic poly(ethylene glycol)s. / Wang, Y. J.; Therien-Aubin, H.; Baille, W. E.; Luo, J. T.; Zhu, X. X.
In: Polymer, Vol. 51, No. 11, 05.2010, p. 2345-2350.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of molecular architecture on the self-diffusion of polymers in aqueous systems
T2 - A comparison of linear, star, and dendritic poly(ethylene glycol)s
AU - Wang, Y. J.
AU - Therien-Aubin, H.
AU - Baille, W. E.
AU - Luo, J. T.
AU - Zhu, X. X.
PY - 2010/5
Y1 - 2010/5
N2 - Star polymers with a hydrophobic cholane core and four poly(ethylene glycol) (PEG) arms, CA(EGn)4, have been synthesized by anionic polymerization. Pulsed-gradient spin-echo NMR spectroscopy was used to study the diffusion behavior of the star polymers, ranging from 1000 to 10,000g/mol, in aqueous solutions and gels of poly(vinyl alcohol) (PVA) at 23°C. The star polymers have a lower self-diffusion coefficient than linear PEGs at equivalent hydrodynamic radius. In water alone, the star polymers and their linear homologues have a similar diffusion behavior in the dilute regime, as demonstrated by the similar concentration dependence of the self-diffusion coefficients. In the semidilute regime, the star polymers tend to aggregate due to their amphiphilic properties, resulting in lower self-diffusion coefficients than those of linear PEGs. 1H NMR T1 measurements at 10-70°C revealed that the PEG arms of the star polymers are more mobile than the core, suggesting the star polymers in solution have a conformation similar to that of poly(propylene imine) dendrimers.
AB - Star polymers with a hydrophobic cholane core and four poly(ethylene glycol) (PEG) arms, CA(EGn)4, have been synthesized by anionic polymerization. Pulsed-gradient spin-echo NMR spectroscopy was used to study the diffusion behavior of the star polymers, ranging from 1000 to 10,000g/mol, in aqueous solutions and gels of poly(vinyl alcohol) (PVA) at 23°C. The star polymers have a lower self-diffusion coefficient than linear PEGs at equivalent hydrodynamic radius. In water alone, the star polymers and their linear homologues have a similar diffusion behavior in the dilute regime, as demonstrated by the similar concentration dependence of the self-diffusion coefficients. In the semidilute regime, the star polymers tend to aggregate due to their amphiphilic properties, resulting in lower self-diffusion coefficients than those of linear PEGs. 1H NMR T1 measurements at 10-70°C revealed that the PEG arms of the star polymers are more mobile than the core, suggesting the star polymers in solution have a conformation similar to that of poly(propylene imine) dendrimers.
KW - Diffusion
KW - NMR spectroscopy
KW - Star polymers
UR - http://www.scopus.com/inward/record.url?scp=77954862635&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77954862635&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2010.03.047
DO - 10.1016/j.polymer.2010.03.047
M3 - Article
AN - SCOPUS:77954862635
VL - 51
SP - 2345
EP - 2350
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 11
ER -