Yang Bo, Yuan Zhen, Dong Xia, Liu Guoming, Wang Dujin
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Rev Sci Instrum. 2024 Aug 1;95(8). doi: 10.1063/5.0202404.
A compact and versatile tensile apparatus for polymer materials is designed and fabricated. Three distinct stretching modes are developed: constant speed, cyclic, and sinusoidal, with adjustable speeds ranging from 0.001 to 120 mm/s. To capture the true strain of the central region, a high-speed camera has been integrated into the apparatus. The temperature of the sample chamber is controlled by flowing air, enabling a homogeneous temperature in the range of RT ∼200 °C. The apparatus is particularly suitable for a synchrotron beamline. The structural evolution of natural rubber during sinusoidal stretching is investigated by in situ wide-angle x-ray scattering. Scattering patterns, force, clamp position, and sample images are saved simultaneously during stretching. Notably, the results reveal a sinusoidal variation in the crystallinity of crosslinked natural rubber when a sinusoidal strain was applied to the sample. The integration of advanced measurement techniques and controlled experimental conditions ensures the acquisition of reliable and accurate data, providing valuable insights into the structural evolution of materials under dynamic deformation conditions.
设计并制造了一种用于聚合物材料的紧凑且多功能的拉伸装置。开发了三种不同的拉伸模式：恒速、循环和正弦模式，速度可在0.001至120毫米/秒范围内调节。为了捕捉中心区域的真实应变，该装置集成了一台高速摄像机。样品腔的温度通过流动的空气进行控制，可在室温至200°C范围内实现均匀温度。该装置特别适用于同步加速器光束线。通过原位广角X射线散射研究了天然橡胶在正弦拉伸过程中的结构演变。在拉伸过程中同时保存散射图案、力、夹具位置和样品图像。值得注意的是，结果表明，当对样品施加正弦应变时，交联天然橡胶的结晶度呈正弦变化。先进测量技术与受控实验条件的结合确保了可靠准确数据的获取，为动态变形条件下材料的结构演变提供了有价值的见解。
