We employed Flash DSC1 apparatus for fast-scan chip-calorimeter measurement in a broad temperature range to compare the isothermal crystallization rates among six polyamide (PA) samples, i.e. PA 46, PA 66, PA 610, PA 612, PA 1012 and PA 12. The double parabolic curves of crystallization half-time versus crystallization temperature revealed that PA 46 crystallizes relatively fast due to its high hydrogen-bonding density favoring thermodynamic driving forces for crystallization in the high temperature region, while PA 1012 and PA 12 crystallize relatively fast due to their low hydrogen-bonding densities favoring short-range diffusion for crystallization in the low temperature region. Furthermore, the cross-over temperatures between two parabolic curvatures of six samples follow their sequences in hydrogen-bonding density, and the Avrami indexes reveal a potential switching in the modes between heterogeneous and homogeneous crystal nucleation.

我们使用Flash DSC1仪器在较宽的温度范围内进行快速扫描芯片量热仪测量，以比较六个聚酰胺（PA）样品（即PA 46，PA 66，PA 610，PA 612，PA 1012和PA 12）的等温结晶速率。结晶半衰期与结晶温度的双抛物线曲线表明，由于PA 46的氢键密度高，因此结晶相对较快，这有利于高温区域内结晶的热力学驱动力，而PA 1012和PA 12结晶相对较快它们具有低的氢键密度，有利于在低温区域结晶的短程扩散。此外，六个样本的两个抛物线曲率之间的交叉温度遵循氢键密度的顺序，