Communication

Gruber, M; Jm, Gruber

doi:10.1097/00001610-198901230-00008

Cited by 2 publications

(2 citation statements)

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“…In this context we also note that Gruber and coworkers found little effect of AM on a different type of HMHEC, where the hydrophobes contained more bulky aromatic moieties. 39 It is not clear why a less specific mode of association would be so sensitive to the nature of the hydrophobes. By contrast, it is well established that the development of inclusion complexes between AM and low-molecular-weight amphiphilic molecules is quite sensitive to the shape of the hydrophobic part of the molecule.…”

Section: Concluding Discussionmentioning

confidence: 99%

“…Moreover, Gruber and co-workers found that the rheology of their composites depended on the rate of cooling after hot mixing. 39 This indicates that the molecular organization of the network that develops on complexation is dependent on sample history. On the other hand, we cannot exclude that part of the differences found in the present study may be due to chemical degradation (depolymerization and/or detachment of hydrophobic side chains), since conditions favoring a molecular dissolution of AM (high temperature or pH) also increase the rate of degradation.…”

Section: Concluding Discussionmentioning

confidence: 99%

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Thermoreversible Gels of Hydrophobically Modified Hydroxyethyl Cellulose Cross-Linked by Amylose

2002

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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 1 H 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 ≈ 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 HMHEC. No complexation was observed between HEC and either AM or PAP.

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Section: Concluding Discussionmentioning

confidence: 99%

Section: Concluding Discussionmentioning

confidence: 99%