Determination of interfacial energies in the aminomethylpropanediol-neopentylglycol organic alloy

The grain boundary groove shapes for solid aminomethylpropanediol in equilibrium with eutectic aminomethylpropanediol-neopentylglycol liquid were directly observed by using a horizontal temperature gradient stage. From the observed grain boundary groove shapes, the Gibbs–Thomson coefficient, solid–liquid interfacial energy and grain boundary energy of solid aminomethylpropanediol in equilibrium with eutectic aminomethylpropanediol-neopentylglycol liquid have been determined to be (5.3 ± 0.5) × 10−8 K m, (8.5 ± 1.3) × 10−3 J m−2 and (16.8 ± 2.9) × 10−3 J m−2, respectively.