Synthesis and characterization of elastomeric polyurea foam,Journal of Applied Polymer Science

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Synthesis and characterization of elastomeric polyurea foam
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2019-12-18 , DOI: 10.1002/app.48839
Nathan Reed ₁ , Nha Uyen Huynh ₁ , Brooke Rosenow ₁ , Kristoffer Manlulu ₁ , George Youssef ₁

Affiliation

Polymeric foams are ubiquitous in impact mitigation for civilian and military applications; the performance in such loading scenarios can be elucidated through quasi‐static and dynamic mechanical testing. The present study reports on the complex microstructure of newly synthesized polyurea foams exhibiting a hierarchical structure consisting of large perforated semi‐closed spherical cells with a mean diameter of 370 ± 162 μm surrounded by smaller closed, spherical cells with size distribution of 69 ± 18 μm. The stress–strain curves were used to calculate the basic mechanical properties and to predict the dynamic behavior of the foams. Nonlinear regression and finite element analyses were used to calibrate the Ogden hyperfoam model to explicate the hyperelastic behavior. The performance of the polyurea foam was found to outperform a benchmark foam in nearly all the elastic and energy absorbing properties. For example, one variation of the newly synthesized foam stored nearly doubled the energy of the benchmark foam while being 12% lighter. Low‐density polyurea foam was found to decelerate an incoming impact mass with a minimum G‐level that was nearly one third lower than the higher density polyurea and benchmark foams. In all, the behavior of the foam is dependent on the parameters of the fabrication process. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48839.

中文翻译：

弹性聚脲泡沫的合成与表征

聚合物泡沫在减轻民用和军事应用的冲击方面无处不在。通过准静态和动态机械测试可以阐明这种负载情况下的性能。本研究报告了新合成的聚脲泡沫的复杂微观结构，该泡沫表现出分层结构，该结构由平均直径为370±162μm的大型穿孔半封闭球形泡孔和尺寸为69±18μm的较小的封闭球形泡孔所包围。应力-应变曲线用于计算基本力学性能并预测泡沫的动态行为。使用非线性回归和有限元分析来校准Ogden超泡沫模型，以阐明超弹性行为。发现在几乎所有的弹性和能量吸收性能上，聚脲泡沫的性能都优于基准泡沫。例如，新合成泡沫的一种变型所存储的能量几乎是基准泡沫的两倍，而重量却轻了12％。发现低密度聚脲泡沫可降低进入的冲击质量，其最低G含量比高密度聚脲和基准泡沫低近三分之一。总之，泡沫的行为取决于制造过程的参数。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学发现低密度聚脲泡沫可降低进入的冲击质量，其最低G含量比高密度聚脲和基准泡沫低近三分之一。总之，泡沫的行为取决于制造过程的参数。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学发现低密度聚脲泡沫可降低进入的冲击质量，其最低G含量比高密度聚脲和基准泡沫低近三分之一。总之，泡沫的行为取决于制造过程的参数。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2020，137，48839。

更新日期：2020-03-27

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