Mechanical characterisation and modelling of a thermoreversible superamolecular polyurethane over a wide range of rates
Mechanical characterisation and modelling of a thermoreversible superamolecular polyurethane over a wide range of rates
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热可逆超分子聚氨酯在各种速率下的机械表征和建模
DOI：
10.1016/j.polymer.2021.123607
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发表时间：
2021
期刊：
影响因子：
4.6
通讯作者：
Chen H
中科院分区：
文献类型：
--
作者：
Chen H
了解热恢复弹性体在不同应变速率和温度下对施加变形的机械响应，对于在工业应用中更有效地开发这些可重复使用材料至关重要。本文的研究旨在了解可愈合的弹性体超分子聚氨酯的热响应和机械响应，研究从低应变率到高应变率的形态、流变学和机械响应。特别是，测量低模量或低强度材料的高应变率响应是具有挑战性的，目前的论文通过结合基于低速率表征的建模框架来解决这个问题。为了支持这项研究，已经进行了重要的表征实验，这也首次表明了聚合物的良好可重复使用性。采用核磁共振波谱、凝胶渗透色谱和x射线小角散射对不同热史试样的结构进行了表征。差示扫描量热法和流变法用于研究加热和冷却循环过程中的热力学性能，同时在商用螺旋驱动测试架、液压加载系统和分离式霍普金森压力棒上进行大应变压缩表征。为了描述聚合物的力学响应，建立了粘弹性软化模型并进行了表征。该模型采用proony序列中的时间-温度叠加原理，结合非线性大应变响应和恢复，结合流变学和动态力学分析数据。该模型能够描述单调加载和循环加载下的低应变率行为，并预测在40至1220 s−1的中高应变率下单调加载的响应。因此，本文证明了使用粘弹性理论及其分析模型来校准和进一步预测聚合物在不同应变速率下的机械行为的有效性：这对于低模量材料特别有用，因为高应变速率表征具有挑战性。
Understanding the mechanical response of thermo-recoverable elastomers to applied deformation at different strain rates and temperatures is crucial for more effective exploitation of these reusable materials in industrial applications. The research presented in this paper aims to understand the thermal and mechanical responses of a healable, elastomeric supramolecular polyurethane, examining morphology, rheology and mechanical responses from low to high strain rates. In particular, measurement of the high strain rate response of low modulus, or low strength, materials is challenging, and the current paper addresses this by incorporating a modelling framework based on low-rate characterization. To support this research, significant characterization experiments have been performed, which also show, for the first time, the excellent reusability of the polymer. The structure of specimens with different thermal histories was characterized using nuclear magnetic resonance spectroscopy, gel permeation chromatography and small angle X-ray scattering. Differential scanning calorimetry and Rheometry were used to investigate thermomechanical performance during heating and cooling cycles, whilst large strain compression characterization was performed on a commercial screw-driven test frame, a hydraulic loading system and a split-Hopkinson pressure bar. To describe the mechanical response of the polymer, a viscoelastic softening model was developed and characterized. The model incorporates data from rheometry and dynamic mechanical analysis using the principle of time-temperature superposition in a Prony series, combined with a non-linear large strain response, and recovery. The model was able to describe low strain rate behaviour under monotonic and cyclic loading, as well as predicting the response to monotonic loading at medium-to-high strain rates from 40 to 1220 s−1. The paper therefore demonstrates the effectiveness of using the viscoelastic theory and its analytical model to calibrate and further predict the mechanical behaviour of polymers at different strain rates: this is particularly useful for low modulus materials for which high strain rate characterization is challenging.
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DOI：
10.1098/rspa.2014.0012
发表时间：
2014-07-08
影响因子：
3.5
作者：
Kendall, Michael J.;Siviour, Clive R.
通讯作者：
Siviour, Clive R.
影响因子：
6
作者：
S. Salimi;L. Hart;A. Feula;D. Hermida-Merino;A. Touré;E. Kabova;L. Ruiz-Cantu;D. Irvine;R. Wildman;K. Shankland;W. Hayes
通讯作者：
S. Salimi;L. Hart;A. Feula;D. Hermida-Merino;A. Touré;E. Kabova;L. Ruiz-Cantu;D. Irvine;R. Wildman;K. Shankland;W. Hayes
高应变率拉伸试验中的样本惯性
影响因子：
--
作者：
M. Hockly;C. Siviour
通讯作者：
C. Siviour
影响因子：
3
作者：
Du, Pengfei;Wu, Meiyin;Zhang, Yuefan
通讯作者：
Zhang, Yuefan
影响因子：
5.5
作者：
P. Woodward;D. Merino;B. W. Greenland;I. Hamley;Zoe Light;A. Slark;W. Hayes
通讯作者：
P. Woodward;D. Merino;B. W. Greenland;I. Hamley;Zoe Light;A. Slark;W. Hayes