Plasticizer Effect on Dielectric and Relaxation Parameters of Xanthan

Hubina, A., Lobko, E., Fomenko, A., Klepko, V. (2013). Plasticizer Effect on Dielectric and Relaxation Parameters of Xanthan. French-Ukrainian Journal of Chemistry, 1(1), 121–124.

The dielectric and relaxation properties of pure and plasticized (with water, glycerol and PPG-200) xanthan were studied by  broadband dielectric relaxation spectroscopy. Within frequency range 10–107 Hz, a solid xanthan and its gels demonstrated two relaxation processes: the β-relaxation and relaxation of gel fragments formed due to xanthan/plasticizer interaction. The relaxation time decreased in the raw of plasticizers: PPG-200 > water > glycerol; the segmental dynamics of xanthan respectively grow. The ionic conductivity of gel samples increased in the following sequence:  water < PPG-200 < glycerol.