This work presents an alternative for the determination of the torsion modulus, G, of polymers. These materials may be subjected to shear stresses in some structural applications; thereby, the knowledge of G is of great interest. For this purpose, a mechanical system featuring a simplified torsion pendulum version and a rotational motion sensor (RMS) coupled to it was used to establish an angular position as a function of time. The applied technique is considered non-destructive and makes it possible to obtain G without the Poisson’s ratio through an equation derived from mechanical spectroscopy and material strength. The main goal is to present and validate the employment of this method for polymers. Therefore, circular cross-sectional samples of extruded polytetrafluoroethylene (PTFE) were subjected to torsional stresses, in which a physical and quantitative explanation is given for the frequency and G curves as a function of the prefixed rotational inertia (I), length (L), and diameter (d). Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were also made to ensure the reliability of data. It is possible to establish an L/d ratio, which explains why G converges to a single value when the sample dimensions are different from each other. It was found that G is approximately 350 MPa for an L/d ratio equivalent to 10.64. Such a value is within limits found in the literature, opening the possibility of assessing other polymers.

这项工作为确定聚合物的扭转模量 G 提供了一种替代方法。这些材料在某些结构应用中可能会受到剪切应力；因此，G 的知识非常有趣。为此，使用具有简化扭摆版本和与其耦合的旋转运动传感器 (RMS) 的机械系统来建立作为时间函数的角位置。所应用的技术被认为是非破坏性的，并且可以通过从机械光谱和材料强度导出的方程获得没有泊松比的 G。主要目标是展示并验证该方法在聚合物中的应用。因此，挤压聚四氟乙烯 (PTFE) 的圆形横截面样品受到扭转应力，其中对作为前缀转动惯量 (I)、长度 (L) 和直径 (d) 的函数的频率和 G 曲线给出了物理和定量解释。还进行了差示扫描量热法（DSC）和动态力学分析（DMA），以确保数据的可靠性。可以建立 L/d 比率，这解释了为什么当样本维度彼此不同时 G 会收敛到单个值。发现对于相当于 10.64 的 L/d 比，G 约为 350 MPa。这样的值在文献中发现的限度内，开启了评估其他聚合物的可能性。还进行了差示扫描量热法（DSC）和动态力学分析（DMA），以确保数据的可靠性。可以建立 L/d 比率，这解释了为什么当样本维度彼此不同时 G 会收敛到单个值。发现对于相当于 10.64 的 L/d 比，G 约为 350 MPa。这样的值在文献中发现的限度内，开启了评估其他聚合物的可能性。还进行了差示扫描量热法（DSC）和动态力学分析（DMA），以确保数据的可靠性。可以建立 L/d 比率，这解释了为什么当样本维度彼此不同时 G 会收敛到单个值。发现对于相当于 10.64 的 L/d 比，G 约为 350 MPa。这样的值在文献中发现的限度内，开启了评估其他聚合物的可能性。