拉应力退火提高聚酰亚胺/颗粒复合膜最大应变的研究

Study on Improving the Maximum Strain of Polyimide/Particle Composite Films via Tensile Stress Annealing

摘要: 本文系统地分析了不同退火温度、退火应力以及退火时间对聚酰亚胺/颗粒复合膜最大应变的影响。实验结果表明，在130℃退火温度下，复合膜的最大应变达到峰值；适当增加退火应力同样可以显著提升样品的最大应变，改善其延展性；此外，长时间(480分钟)退火有助于分子链的深度松弛及沿应力方向取向，形成更规整的非晶区结构，从而进一步提高材料的最大应变。这些发现为优化聚酰亚胺复合材料的力学性能提供了理论依据和技术支持。

Abstract: This paper systematically analyzes the effects of different annealing temperatures, annealing stresses, and annealing times on the maximum strain of polyimide/particle composite films. The experimental results show that the maximum strain of the composite film reaches a peak value at an annealing temperature of 130˚C; appropriately increasing the annealing stress can also significantly enhance the maximum strain of the sample and improve its ductility. Additionally, long-term annealing (480 minutes) facilitates the deep relaxation of molecular chains and their orientation along the stress direction, leading to the formation of a more regular amorphous region structure, thereby further improving the maximum strain of the polyimide composite film. These findings provide a theoretical basis and technical support for optimizing the mechanical properties of polyimide composite materials.