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- Chronakis, IS (author)
Thermoreversible gels of hydrophobically modified hydroxyethyl cellulose cross-linked by amylose
- Article/chapterEnglish2002
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- 2002-04-05
- American Chemical Society (ACS),2002
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- LIBRIS-ID:oai:lup.lub.lu.se:c60eb2f2-a6f5-4fa2-8faa-1af3f5942684
- https://lup.lub.lu.se/record/338534URI
- https://doi.org/10.1021/ma011980qDOI
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- Language:English
- Summary in:English
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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 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.
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- Egermayer, MonicaLund University,Lunds universitet,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fk1-meg (author)
- Piculell, LennartLund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fk1-lpi (author)
- Kemiska institutionenInstitutioner vid LTH (creator_code:org_t)
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- In:Macromolecules: American Chemical Society (ACS)35:10, s. 4113-41220024-92971520-5835
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