A stretching apparatus with broad strain rate and temperature ranges for in-situ x-ray scattering measurements of polymers

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-19 DOI:10.1063/5.0201598

Yimin Lu, Erjie Yang, Jianhe Zhu, Shenghui Liu, Kunpeng Cui, Hang Guo, Liangbin Li

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Abstract

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.

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用于聚合物原位 X 射线散射测量的拉伸装置，具有较宽的应变速率和温度范围

针对聚合物材料，特别是聚合物薄膜，我们设计了一种拉伸仪器，能够在较宽的应变速率范围（10-3-250 s-1）和较宽的温度范围（-75-250 °C）内进行拉伸试验。具体来说，这种拉伸仪器可与原位超小型、小型和广角 X 射线散射（USAXS/SAXS/WAXS）测量相结合。样品拉伸是通过伺服电机驱动的轧辊同步旋转实现的。从扭矩传感器提取的输出电信号与轧辊转速和样品初始尺寸相结合，可确定工程应力（σ）和亨斯基应变（ε）之间的关系。利用样品室和精确的控制回路，可以通过热气流加热或冷液氮流冷却来达到规定的温度。通过将这一拉伸装置与上海同步辐射设施（SSRF）BL10U1 光束线的高亮度 X 射线源和具有超快采集速率的探测器相结合，可以监测聚合物样品在高速加载和温度变化等苛刻条件下的多尺度结构演变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.