containing only one plasticizer, either water (0:1) or glycerol(1:0), showed much lower values than those where both plas-ticizers were used altogether. Interestingly, Gómez-Martínezet al. (2009) also obtained higher torque values for a samplecontaining a glycerol/water blend as plasticizer, if compared tosamples containing only one of them. With this regard, someauthors (Chen et al., 2009) have analyzed the hydrogen bond-ing of glycerol aqueous solutions by means of a moleculardynamics simulation method, finding that average numbersof hydrogen bonds per water and glycerol molecule and theirlifetime depend on the glycerol mole fraction. In our case,it is complicated to find detailed explanation to the resultsobtained, as the hydrogen bonds established between glyceroland