negative maximum
5.A variation of complex viscosity of PTT/PBT blends with composition shows positive-negative deviations from the log-additivity rule and the viscosity-composition curves reveal an S shape. The minimum and maximum complex viscosity are found when PBT content is 10% and 90% weight fraction, respectively.
7.Based on the atomicity and molecularity (negative deviation of activities, minimum 6G and OHof mixing at certain composition,abruptly going up of excess stability as well as maximum resistivity at compound formation composition and phase diagrams) the coexistence theory of metallic melts structure involving compound formation has been suggested.

