中文摘要：

利用拉伸热台对尼龙6在不同温度下的拉伸性能进行了测试和分析.随着拉伸温度的升高,尼龙6样品的屈服强度和杨氏模量逐渐下降.采用了一个阿伦尼乌斯模型来描述尼龙6屈服强度与拉伸温度之间的关系,并描述了尼龙6样品黏度、玻璃化温度对屈服强度的影响.通过原位同步辐射广角衍射分析,我们发现未拉伸的尼龙6样品中的α相与γ相的相对比率随温度升高而下降.在拉伸条件下,随着拉伸温度的升高,样品的结晶部分容易产生滑移或晶区的熔融,有序程度下降,因而样品承载外力的能力下降,体现为屈服强度和杨氏模量的下降.

英文摘要：

The temperature dependent stress-strain curves of Nylon 6 were obtained via tensile hot stage,and the in situ WAXS experiments were measured simultaneously. The results indicated that the temperature related yield stress,breaking strength and modulus of Nylon 6 can be described by the Arrhenius equation. During the process of stretching Nylon 6 experienced elastic deformation,yield, strain hardening and fracture. The yielding on Nylon 6 stress-strain curves was unobvious with the low draw rate, meanwhile, the yielding turned to more unobvious gradually at higher stretching temperatures. The stress-strain curves of Nylon 6 are similar to each other within the measured temperature range. Nevertheless, the yield strength and modulus decreased with the increasing of stretching temperature. By analyzing the WAXS profile,it was found that the a-phase： T-phase ratio of undeformed Nylon 6 samples decreased along with the temperature increased. Also, at high temperatures, the crystalline phase of Nylon 6 slipped and/or melted during tensile deformation more easily. In the meantime, the relationship between the stretching temperature and mechanical properties was obtained after fitting the temperature dependent results. It was found that the temperature related relationship obeys the Arrhenius equation. In addition,the viscosity dependence of yield stress was given in the paper.