Aqueous/brine solutions viscosity and surface properties of hydrophobically modified scleroglucans: Role of grafted chain length.
Alkyl chain length
Hydrophobic modification
Scleroglucan
Surface tension
Viscosity
Journal
Carbohydrate polymers
ISSN: 1879-1344
Titre abrégé: Carbohydr Polym
Pays: England
ID NLM: 8307156
Informations de publication
Date de publication:
01 Feb 2020
01 Feb 2020
Historique:
received:
28
08
2019
revised:
07
10
2019
accepted:
21
10
2019
entrez:
13
12
2019
pubmed:
13
12
2019
medline:
13
12
2019
Statut:
ppublish
Résumé
Acyl chlorides with different alkyl lengths (C6, C10 or C18) are grafted onto scleroglucan (Sclg) and aqueous/brine solutions viscosities of modified samples are studied at 25/90 °C. All modified Sclgs solutions show lower viscosities than those of the unmodified Sclg solutions, due to the helix-coil transition caused by the modification. The viscosity of the samples aqueous solutions at 25 °C is increased by increasing the grafted alkyl length. However, the viscosity profiles of the aqueous solutions of modified Sclgs are superimposable at 90 °C. The modified Sclg by C10 moieties exhibits the highest viscosity in the brine solution at 90 °C. The results are interpreted by a model depicting the effects of the alkyl lengths on the distances among the Sclg chains and the chains hydrophobic associations. Moreover, the surface and amphiphilic properties of the modified Sclgs in their aqueous solutions are correlated with their alkyl side chain length.
Identifiants
pubmed: 31826513
pii: S0144-8617(19)31187-7
doi: 10.1016/j.carbpol.2019.115519
pii:
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
115519Informations de copyright
Copyright © 2019 Elsevier Ltd. All rights reserved.