Densities, Viscosities of Pure 1-(2-Hydroxyethyl) Pyrrolidine, 3-Amino-1-Propanol, Water, and Their Mixtures at 293.15 to 363.15 K and Atmospheric Pressure.

For blends of the two amines, the V E show low negative values with a clear trend at lower temperatures ( T ≤ 303 K) but larger scatter at higher temperatures ( T > 303 K). 1-(2HE)PRLD has cyclic pyrrolidine and hydroxyethyl (-C 2 H 5 O) groups 26 and 3A1P has an aminopropanol group. 27 It may be the consequence of the mixture being favorable for geometric filling due to steric hindrances at lower temperatures but then to be an unfavorable structural geometric at higher temperatures due to molecular motion ( Figure 3 c).

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