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首页> 外文期刊>Journal of Applied Polymer Science >Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates
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Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

机译：刚性聚氨酯泡沫纳米结构用细菌纳米纤维素处于低和中等应变率的压缩性能

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摘要

Nanocellulose reinforced foams are lightweight with improved mechanical properties; however, the strain-rate effect on their mechanical response is not yet fully understood. In this work, rigid polyurethane foams (PUFs) nanostructured with bacterial nanocellulose at 0.2 wt % (BNCF) and without it (PUF) are synthesized and subjected to compression tests at different strain rates. The BNC acts as a nucleation agent, reducing the cell size but maintaining a similar apparent density of 40.4 +/- 3.3 kg m(-3). Both BNCF and PUF exhibit strain-rate effect on yield stress and densification strain. The BNCF exhibits localized progressive crushing and reduced friability, causing a remarkable recovery in the transverse direction. Numerical simulations show that functionally graded foams subjected to impact could be designed using different layers of PUF and BNCF to vary energy absorption and acceleration rate. The results presented herein warrant further research of the mechanical properties of nanostructured foams for impact applications. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48701.
机译：纳米纤维素增强泡沫具有改善的机械性能的重量轻;然而，尚未完全理解对其机械反应的应变率效应。在这项工作中，用细菌纳米纤维素在0.2wt％（BNCF）和不含其（PUF）的刚性聚氨酯泡沫（PUF）纳米结构，并以不同的应变率进行压缩试验。 BNC用作成核剂，降低细胞尺寸，但保持相似表观密度为40.4 +/- 3.3kg m（-3）。 BNCF和PUF均表现出对屈服应力和致密化应变的应变率影响。 BNCF表现出局部渐进式破碎和减少的脆性，在横向方向上引起显着的恢复。数值模拟表明，可以使用不同的PUF和BNCF层设计撞击的功能分级泡沫，以改变能量吸收和加速率。本文提出的结果需要进一步研究纳米结构泡沫的机械性能，用于抗冲击应用。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48701。

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