Naslov
Thermal Phase Transitions of Cationic Oligomeric Surfactants

Autori
Jurašin, Darija ; Pustak, Anđela ; Habuš, Ivan ; Šmit, Ivan ; Filipović-Vinceković, Nada

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts / Adamczyk, Zbigniew ; Barbasz, Jakub ; Nattich, Malgorzata, Szatkowska, Kataryna - Krakov : DEKA Printing Office, 2008, 305-305

ISBN
978-83-60514-08-5

Skup
22nd Conference of the European Colloid and Interface Society

Mjesto i datum
Kraków, Poljska, 31.08.2008. - 05.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
oligomeric surfactants; solid phase transitions

Sažetak
A series of cationic oligomeric surfactants (quaternary dodecyldimethylammonium ions with two, three or four alkyl chains connected with ethylene spacer at the headgroup level) were synthesized and characterized. The influence of the number of dodecyl chains, i.e. the degree of oligomerization on the structural and thermal properties of oligomeric surfactants was investigated by means of IR and NMR spectral analysis, X-ray diffraction, thermogravimetry, differential scanning calorimetry, and polarizing microscopy. The number of thermal phase transitions and the sequence of phases are markedly affected by the degree of oligomerization. Dimeric and trimeric surfactant exhibited a complex polymorphism and thermotropic mesomorphism from the crystalline form to the liquid crystalline phases of smectic type. In contrast, tetrameric surfactant displayed only one endothermic transition associated with melting and decomposition. The observed effects are explained by different chain packing in the solid phase.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA