Naslov
Phase behavior of surfactant-polymer mixtures in relation to polymer charge

Autori
Bujan, Marija ; Vinceković, Marko ; Tomašić, Vlasta

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

Izvornik
Abstract Book / Baglioni, Piero - Firenza : München : University of Florence, 2003, 238-238

Skup
17th ECIS Conference

Mjesto i datum
Firenca, Italija, 21.09.2003. - 26.09.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
carrageenans; dodecylammonium chloride; phase behavior

Sažetak
The phase behavior of dodecylammonium chloride (DDACl) and differently charged carrageenans (CAR) was examined at 303K by conductometry, potentiometry, surface tension, static light scattering and microelectrophoretic measurements. The complex interactions between DDACl and CAR starting at very low concentration are accompanied by the formation of single and coexisting phases, differently structured soluble polymer-surfactant monomer complexes, surfactant micelles, polymer-micelle complexes, and solid crystalline and gel phases. The multistep mechanism of DDACl and CAR interactions was discussed in terms of successive electrostatic, hydrophobic, and intra- and interpolymer interactions. It was shown how the increase of carrageenans charge density (the three main forms of carrageenans differ in the number of sulfate groups per disaccharide ; k-CAR has one, i-CAR has two, and l-CAR has three, respectively) lead to a wide variation in surfactant monomers adsorption to polymer chains and phase separation properties. The increase of CAR charge density improved the degree of ordering in various carrageenan-surfactant species. Giant vesicles were found as single and/or coexisting phases.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Prehrambena tehnologija

POVEZANOST RADA