Volumetric behaviour of maltose-water, maltose-glycerol and starch-sorbitol-water systems mixtures in relation to structural relaxation.
The densities of amorphous maltose-water, maltose-glycerol and starch-sorbitol-water mixtures were measured using a vibrating-tube density meter and pycnometry. The volumetric change on mixing was investigated through the calculation of the quantity DeltaV/V, the difference between (experimental) volume of the mixture and the linear composition weighted pure constituent volumes (ideal mixing). For all of the systems studied the quantity DeltaV/V was negative and approached a minimum of -0.03 and -0.015 at mass fractions of maltose in the region of 0.75 and 0.85 for the maltose-water and maltose-glycerol mixtures, respectively. Results are discussed in the context of volume change due to structural relaxation of vitreous materials and related to the phenomenon of antiplasticisation.
Lourdin
Denis
D
Institut National de la Recherche Agronomique, BP 71627, 44316 Nantes Cedex, France. lourdin@nantes.inra.fr
Colonna
Paul
P
Ring
Stephen G
SG
D002152:Calorimetry, Differential Scanning; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003720:Densitometry; D005990:Glycerol / Q000737:chemistry*; D008320:Maltose / Q000737:chemistry*; D044367:Phase Transition; D013012:Sorbitol / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
D014867:Water; D013012:Sorbitol; D008320:Maltose; D013213:Starch; D005990:Glycerol