Naslov
Thermal and Structural Study of Mesomorphic Dodecylammonium Carrageenates

Autori
Vinceković, Marko ; Pustak, Anđela ; Liu, F. ; Ungar, Goran ; Tušek-Božić, Ljerka ; Bujan, Marija ; Šmit, Ivan ; Filipović-Vinceković, Nada

Izvornik
Journal of colloid and interface science (0021-9797) 341 (2010), 1; 117-123

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
carrageenan ; dodecylammonium chloride ; complexation ; thermal analysis ; SAXS

Sažetak
Structural characteristics and thermal stability of a series of dodecylammonium carrageenates formed by stoichiometric complexation of dodecylammonium chloride and differently charged carrageenans (k-, i- 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 two layers of carrageenan chains and a nonpolar sublayer consists of fully interdigitated 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Poljoprivreda (agronomija)

POVEZANOST RADA