Structural and thermal study of mesomorphic dodecylammonium carrageenates |
| |
Authors: | M Vinceković A Pustak Lj Tušek-Božić F Liu G Ungar M Bujan I Šmit N Filipović-Vinceković |
| |
Institution: | 1. Department of Chemistry, Faculty of Agronomy, Ru?er Bo?kovi? Institute, Zagreb, Croatia;2. Department of Materials Chemistry, Ru?er Bo?kovi? Institute, Zagreb, Croatia;3. Department of Physical Chemistry, Ru?er Bo?kovi? Institute, Zagreb, Croatia;4. Department of Engineering Materials, University of Sheffield, Sheffield, United Kingdom |
| |
Abstract: | Structural characteristics and thermal stability of a series of dodecylammonium carrageenates formed by stoichiometric complexation of dodecylammonium chloride and differently charged carrageenans (κ-, ι- and λ-carrageenan, respectively) were investigated. IR spectral analysis confirmed the electrostatic and hydrogen bond interactions between the dodecylammonium and carrageenan species. X-ray diffraction experiments show increased ordering in the complexes compared to that in the parent carrageenans. Dodecylammonium carrageenates have a layer structure, in which a polar sublayer contains layers of carrageenan chains and a nonpolar sublayer consists of conformationally disordered dodecylammonium chains electrostatically attached to the carrageenan backbone. The major factor that determines the dodecylammonium carrageenate structure is cationic surfactant, while the carrageenans moiety plays a major role in determining thermal properties. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|