Interactions between ethyl(hydroxyethyl) cellulose and lysine-based surfactants in aqueous media

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Maria Teresa Calejo (Autor) Outra; Anna Lena Kjoniksen (Autor) Outra; Eduardo F Marques (Autor) FCUP; Maria J Araujo (Autor) FCUP; Sverre Arne Sande (Autor) Outra; Bo Nystroem (Autor) Outra

Revista

Título: European Polymer Journal

Vol. 48

Páginas: 1622-1631

ISSN: 0014-3057

Editora: Elsevier

Indexação

ISI Web of Knowledge - 12 Citações

Scopus - 13 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-002-6KB

DOI: 10.1016/j.eurpolymj.2012.06.009

Abstract (EN): In this work, the interaction between ethyl(hydroxyethyl) cellulose (EHEC) and three dimeric lysine-based surfactants of distinct chain length (C-6, C-8 and C-10) have been assessed and the system was evaluated in terms of its temperature-dependent gelling capacity. The viscosity profile depends on the specific surfactant, its concentration and temperature. The observed profiles reflected polymer-polymer associations at elevated temperatures and polymer-surfactant interactions, implying the formation of micellartype associations. The systems induce gelation at higher temperatures. Longer chain-length surfactants induce gelation at lower concentrations due to their stronger tendency to selfassemble. The thermo-responsive gels showed gel strength generally lower than 20 Pa.s(n) and a fractal dimension of 2.3-2.4, respectively, indicating the formation of soft gels comprising a tight and homogeneous network. The weakest gel was produced in the presence of the C-6 surfactant. 2D Small-Angle Light Scattering patterns showed a pronounced effect of temperature in terms of the evolution of large hydrophobic clusters, an event precluded when high concentrations of the longer chain surfactants were used.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10