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Thermoreversible gels of hydrophobically modified hydroxyethyl cellulose cross-linked by amylose

Chronakis, IS; Egermayer, Monica LU and Piculell, Lennart LU (2002) In Macromolecules 35(10). p.4113-4122
Abstract
Aqueous mixtures of hydrophobically modified hydroxyethyl cellulose (HMHEC) or unmodified hydroxyethyl cellulose (HEC), with amylose (AM) or potato amylopectin (PAP), have been investigated by rheology, turbidity, and H-1 NMR measurements. It is concluded that the AM molecules cross-link HMHEC chains by forming helical inclusion complexes with the hydrophobic side chains of HMHEC, leading to thermoreversible, elastic, and thixotropic gels at ambient temperatures. The complexation ability, the setting-melting temperature of the AM-HMHEC complexes, the strength of the association, and the viscoelastic behavior of the gels vary with the polymer concentrations, the pH, and the preparation method. AM-HMHEC complexes were obtained at a pH range... (More)
Aqueous mixtures of hydrophobically modified hydroxyethyl cellulose (HMHEC) or unmodified hydroxyethyl cellulose (HEC), with amylose (AM) or potato amylopectin (PAP), have been investigated by rheology, turbidity, and H-1 NMR measurements. It is concluded that the AM molecules cross-link HMHEC chains by forming helical inclusion complexes with the hydrophobic side chains of HMHEC, leading to thermoreversible, elastic, and thixotropic gels at ambient temperatures. The complexation ability, the setting-melting temperature of the AM-HMHEC complexes, the strength of the association, and the viscoelastic behavior of the gels vary with the polymer concentrations, the pH, and the preparation method. AM-HMHEC complexes were obtained at a pH range of 7-12.5, but a maximum storage modulus was observed at pH approximate to 10. The AM-HMHEC complexation is modified or completely abolished by the addition of surfactant. A weak synergistic interaction was found for mixtures of PAP with HNIHEC. No complexation was observed between HEC and either AM or PAP. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Macromolecules
volume
35
issue
10
pages
4113 - 4122
publisher
The American Chemical Society
external identifiers
  • wos:000175378600049
  • scopus:0037035679
ISSN
0024-9297
DOI
10.1021/ma011980q
language
English
LU publication?
yes
id
c60eb2f2-a6f5-4fa2-8faa-1af3f5942684 (old id 338534)
date added to LUP
2007-08-14 15:59:03
date last changed
2017-03-12 03:29:37
@article{c60eb2f2-a6f5-4fa2-8faa-1af3f5942684,
  abstract     = {Aqueous mixtures of hydrophobically modified hydroxyethyl cellulose (HMHEC) or unmodified hydroxyethyl cellulose (HEC), with amylose (AM) or potato amylopectin (PAP), have been investigated by rheology, turbidity, and H-1 NMR measurements. It is concluded that the AM molecules cross-link HMHEC chains by forming helical inclusion complexes with the hydrophobic side chains of HMHEC, leading to thermoreversible, elastic, and thixotropic gels at ambient temperatures. The complexation ability, the setting-melting temperature of the AM-HMHEC complexes, the strength of the association, and the viscoelastic behavior of the gels vary with the polymer concentrations, the pH, and the preparation method. AM-HMHEC complexes were obtained at a pH range of 7-12.5, but a maximum storage modulus was observed at pH approximate to 10. The AM-HMHEC complexation is modified or completely abolished by the addition of surfactant. A weak synergistic interaction was found for mixtures of PAP with HNIHEC. No complexation was observed between HEC and either AM or PAP.},
  author       = {Chronakis, IS and Egermayer, Monica and Piculell, Lennart},
  issn         = {0024-9297},
  language     = {eng},
  number       = {10},
  pages        = {4113--4122},
  publisher    = {The American Chemical Society},
  series       = {Macromolecules},
  title        = {Thermoreversible gels of hydrophobically modified hydroxyethyl cellulose cross-linked by amylose},
  url          = {http://dx.doi.org/10.1021/ma011980q},
  volume       = {35},
  year         = {2002},
}