ISSN:
1572-8927
Schlagwort(e):
Alkali metal acetate
;
alkali metal trifluoroacetate
;
Et4NX solution
;
glass-forming composition region
;
glass transition temperature
;
cationic effect
;
anionic effect
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Glass-forming composition regions of aqueous CH3COOM (M = Li, Na, K, Rb, Cs, and Tl), CF3COOM (M = Li, Na, K, Rb, and Cs), and Et4NX (Et4 = C2H5, X = OH, CH3COO, Cl, Br, NO3, and SCN) solutions are reported as a function of water concentration R (R = moles of water per moles of salt). Glass transition temperatures (T g) were measured by a simple differential thermal analysis (DTA) method with a cooling rate of about 600 K-min−1. The T g of all solutions decrease with increasing R (decreasing salt concentration). It is found that T g at the same R value decrease in the order Na+ 〉 Li+ 〉 K+ 〉 Rb+ 〉 Cs+ in all glass-forming composition regions of the alkali acetate salt and alkali trifluoroacetate salt solutions. T g for Et4NX solutions decrease in the order CH3COO− ~OH− 〉 Cl− 〉 Br− 〉 NO 3 − 〉 SCN−. The effects of the cation and anion on the glass-forming behavior in these aqueous solutions are discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1021751608253
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