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首页> 外文期刊>Journal of Applied Polymer Science >Effect of the Pressure on the Crystallization Behavior of Polyamide 66
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Effect of the Pressure on the Crystallization Behavior of Polyamide 66

机译：压力对聚酰胺66结晶行为的影响

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摘要

The crystallization behavior of polyamide 66 under high pressure up to 2500 bar was investigated by the use of dilatometric and calorimetric techniques in nonisotherrnal and isothermal conditions. The solid-solid Brill transition is detected from the evolution of the specific volume in the PVT diagram. The variation of super- cooling was examined under different pressures and temperatures. In nonisothermal f conditions, when the same cooling rate is applied, the crystallization supercooling is not changed for different pressures. In isothermal conditions, for a given temperature, a pressure increase extends the crystallization supercooling. By the analysis of melting peaks of samples crystallized in different conditions of pressure and temperature, we can conclude that the increasing of the crystallization supercooling leads to a decrease of the lamellae thickness. Finally, the evolution of the thermodynamic equilibrium melting temperature according to pressure was examined.
机译：通过在非等温和等温条件下使用膨胀和量热技术，研究了聚酰胺66在高达2500 bar的高压下的结晶行为。从PVT图中特定体积的变化可以检测出固-固布里尔相变。在不同的压力和温度下检查过冷度的变化。在非等温条件下，采用相同的冷却速度时，对于不同的压力，结晶过冷不会改变。在等温条件下，对于给定的温度，压力增加会延长结晶过冷度。通过分析在不同压力和温度条件下结晶的样品的熔融峰，我们可以得出结论，结晶过冷度的增加导致薄片厚度的减小。最后，研究了热力学平衡熔化温度根据压力的变化。

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