Lu Yimin, Yang Erjie, Zhu Jianhe, Liu Shenghui, Cui Kunpeng, Guo Hang, Li Liangbin
National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China.
Key Laboratory of Precision and Intelligent Chemistry, CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Rev Sci Instrum. 2024 Sep 1;95(9). doi: 10.1063/5.0201598.
A stretching apparatus capable of conducting tensile tests over a broad strain rate range (10-3-250 s-1) and a wide temperature range (-75-250 °C) has been designed for polymeric materials, in particular the polymeric films. Specifically, this stretching apparatus can be combined with in situ ultrasmall-, small-, and wide-angle x-ray scattering (USAXS/SAXS/WAXS) measurements. The sample stretching is achieved through the synchronized rotation of rolls, powered by servo motors. The output electrical signal extracted from a torque sensor, when combined with the rotational speed of rolls and initial sample dimensions, enables the determination of the relationship between engineering stress (σ) and Hencky strain (ε). With the sample chamber and precise control loop, the prescribed temperature can be achieved using either hot airflow for heating or cold liquid nitrogen flow for cooling. By integrating this stretching apparatus with a high brilliance x-ray source at beamline BL10U1 in Shanghai Synchrotron Radiation Facility (SSRF) and detectors featuring ultrafast acquisition rates, it becomes possible to monitor multiscale structure evolutions of polymeric samples under harsh conditions involving high-speed loading combined with varying temperatures.
一种能够在较宽的应变率范围（10⁻³ - 250 s⁻¹）和较宽的温度范围（-75 - 250°C）内对聚合物材料，特别是聚合物薄膜进行拉伸试验的拉伸装置已被设计出来。具体而言，该拉伸装置可与原位超小角、小角和广角X射线散射（USAXS/SAXS/WAXS）测量相结合。样品的拉伸通过由伺服电机驱动的辊子同步旋转来实现。从扭矩传感器提取的输出电信号，与辊子的转速和初始样品尺寸相结合，能够确定工程应力（σ）与亨基应变（ε）之间的关系。借助样品室和精确的控制回路，使用热气流加热或冷液氮流冷却均可达到规定的温度。通过将该拉伸装置与上海同步辐射装置（SSRF）光束线BL10U1处的高亮度X射线源以及具有超快采集速率的探测器相结合，就有可能在涉及高速加载和温度变化的苛刻条件下监测聚合物样品的多尺度结构演变。
