Tang Miao, Huang Gang, Zhang Huanhuan, Liu Yuling, Chang Haijian, Song Hongzan, Xu Donghua, Wang Zhigang
CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui Province 230026, P. R. China.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin Province 130022, P. R. China.
ACS Omega. 2017 May 22;2(5):2214-2223. doi: 10.1021/acsomega.7b00242. eCollection 2017 May 31.
In this study, three typical impact-protective materials, D3O, PORON XRD, and DEFLEXION were chosen to explore the dependences of rheological and compression mechanical properties on the internal cellular structures with polymer matrix characteristics, which were examined using Fourier transform infrared spectroscopy, thermogravimetric analyses, and scanning electron microscopy with energy dispersive spectroscopy. The rheological property of these three foaming materials were examined using a rheometer, and the mechanical property in a compression mode was further examined using an Instron universal tensile testing machine. The dependences of rheological parameters, such as dynamic moduli, normalized moduli, and loss tangent, on angular frequency, and the dependences of mechanical properties in compression, such as the degree of strain-hardening, hysteresis, and elastic recovery, on the strain rate for D3O, PORON XRD, and DEFLEXION can be well-correlated with their internal cellular structural parameters, revealing, for example, that D3O and PORON XRD exhibit simultaneously high strength and great energy loss in a high-frequency impact, making them suitable for use as soft, close-fitting materials; however, DEFLEXION dissipates much energy whether it suffers a large strain rate or not, making it suitable for use as a high-risk impact-protective material. The rheometry and compression tests used in this study can provide the basic references for selecting and characterizing certain impact-protective materials for applications.
在本研究中，选择了三种典型的抗冲击材料D3O、PORON XRD和DEFLEXION，以探究流变学和压缩力学性能对具有聚合物基体特性的内部细胞结构的依赖性，使用傅里叶变换红外光谱、热重分析以及带有能谱的扫描电子显微镜对这些特性进行了检测。使用流变仪检测了这三种泡沫材料的流变性能，并使用英斯特朗万能拉伸试验机进一步检测了压缩模式下的力学性能。D3O、PORON XRD和DEFLEXION的流变参数（如动态模量、归一化模量和损耗角正切）对角频率的依赖性，以及压缩力学性能（如应变硬化程度、滞后现象和弹性回复）对应变率的依赖性，都与其内部细胞结构参数具有良好的相关性，例如，这表明D3O和PORON XRD在高频冲击下同时表现出高强度和较大的能量损失，使其适合用作柔软、贴合的材料；然而，DEFLEXION无论应变率大小都会耗散大量能量，使其适合用作高风险抗冲击材料。本研究中使用的流变测量和压缩试验可为选择和表征某些应用中的抗冲击材料提供基本参考。
