The phase behavior of binary mixtures of non-crystallizable racemic poly (d, l-lactic acid) (PDLLA) and the mosquito-repellent/drug N,N-diethyl-3-methylbenzamide (DEET) was analyzed with respect to the effect of the polymer molar mass on the liquid-liquid (L–L) phase separation characteristics, by cloud-point measurements and differential scanning calorimetry. The PDLLA/DEET system shows a subambient upper critical solution temperature (UCST), with the critical temperature decreasing and critical polymer concentration increasing with decreasing molar mass of PDLLA. The obtained L–L phase separation curves were used to estimate the temperature-dependence of the interaction parameter, confirming that the enhanced miscibility of the system components in case of low molar mass PDLLA is due to increased entropy of mixing.
The aim of this article is to reclassify Setswana short stories according to their treatment of female characters. Critics such as Ranamane have classified Setswana literary works according to year of publication, without ...
Bergenholtz, Henning; Bothma, T.J.D. (Theodorus Jan Daniel); Gouws, Rufus H.(Buro van die WAT, 2015)
In the information society, it is much easier for someone to find relevant data if s/he has an information need because of the availability of databases and electronic information tools. In information science this topic ...
