用一种新型扭轴复合流变仪表征复泊松比的温度和频率依赖性

IF 3 2区 工程技术 Q2 MECHANICS Journal of Rheology Pub Date : 2023-11-01 DOI:10.1122/8.0000675
José Alberto Rodríguez Agudo, Jan Haeberle, Michael Müller-Pabel, Alexander Troiss, Abhishek Shetty, Joachim Kaschta, Christopher Giehl
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引用次数: 0

摘要

本文讨论了用扭轴复合流变仪间接测量基于剪切模量和杨氏模量的复泊松比的可行性。为此,在相同的环境条件下,对同一圆柱形试样依次进行扭转和拉伸等温频率扫描。该方法在两种非晶聚合物、半结晶聚合物、聚合物共混物和共聚物上进行了测试。本文包括广泛的文献综述和方法的不确定度评估,为后续与现有研究的数据比较提供基础。实验数据表明,除非晶态聚合物外,所有样品的复泊松比随温度接近α-弛豫均呈单调增长,最大可达0.5。复泊松比在α-弛豫温度附近有局部最小值,在α-弛豫温度以上退火后消失。复泊松比的实部和虚部还可以通过计算扭向和张向测量的相移角来确定。所有聚合物在玻璃态的扭相移角和张相移角之间都存在一定的偏移,随着温度接近α-弛豫而逐渐减小。复泊松比计算结果与现有方法得到的文献数据吻合较好。这证实了该方法适用于高达α-弛豫温度的聚合物,由于非破坏性方法而节省了大量时间。考虑到文献中数据的有限可用性,这是特别有趣的。
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Characterization of the temperature and frequency dependency of the complex Poisson’s ratio using a novel combined torsional-axial rheometer
This study discusses the feasibility of using a combined torsional-axial rheometer to indirectly measure the complex Poisson’s ratio based on shear and Young’s modulus. For this purpose, isothermal frequency sweeps in torsion and extension are performed sequentially on the same cylindrical specimen and under the same environmental conditions. The method is tested on two amorphous polymers, a semicrystalline polymer, a polymer blend, and a copolymer. The article includes an extensive literature review and an uncertainty assessment of the method to provide a basis for subsequent data comparison with existing research. The experimental data show a monotonic increase in the complex Poisson’s ratio up to 0.5 as the temperature approaches α-relaxation for all samples, except for the amorphous polymer. The latter shows a local minimum in the complex Poisson’s ratio observed near α-relaxation, which disappears after thermal annealing of the sample above the α-relaxation temperature. The real and imaginary parts of the complex Poisson’s ratio are additionally determined by evaluating both phase shift angles from torsional and extensional measurements. All polymers show a certain offset between the torsional and extensional phase shift angles in the glassy state, which gradually decreases as the temperature approaches α-relaxation. The complex Poisson’s ratio results are in good agreement with the literature data obtained by existing methods. This confirms that the method is applicable to polymers up to α-relaxation temperatures with significant time savings due to the nondestructive approach. This is of particular interest, given the limited availability of data in the literature.
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来源期刊
Journal of Rheology
Journal of Rheology 物理-力学
CiteScore
6.60
自引率
12.10%
发文量
100
审稿时长
1 months
期刊介绍: The Journal of Rheology, formerly the Transactions of The Society of Rheology, is published six times per year by The Society of Rheology, a member society of the American Institute of Physics, through AIP Publishing. It provides in-depth interdisciplinary coverage of theoretical and experimental issues drawn from industry and academia. The Journal of Rheology is published for professionals and students in chemistry, physics, engineering, material science, and mathematics.
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