Influence of the loading rate on liquid‐crystalline epoxy resin systems
Influence of the loading rate on liquid‐crystalline epoxy resin systems
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负载率对液晶环氧树脂体系的影响
DOI：
10.1002/polb.20424
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Ochi
中科院分区：
文献类型：
--
作者：
M. Harada;K. Aoyama;M. Ochi
本文研究了具有多畴结构（畴尺寸约为40 μm）的液晶环氧树脂体系的断裂韧性随加载速率的变化。在该系统中，断裂韧性急剧下降，从1.96到0.22 MN/m3/2的加载速率增加（0.1-5 mm/min）。用偏光显微镜和偏振红外光谱研究了不同加载速率体系断裂面附近的网络取向。结果，在相对低的加载速率（0.1和0.5 mm/min）系统中，在断裂表面附近观察到介晶基团的大的取向区域，但在高加载速率（2和5 mm/min）系统中没有观察到这种现象。这些结果表明，在低加载速率下，该系统的高断裂韧性是由于在断裂过程中的介晶基团的重取向的幅度和区域，而不能实现高的韧性，在高加载速率下，因为加载速率太快，允许包含介晶基团的网络的取向。© 2005威利期刊有限公司聚合物科学杂志B部分：聚合物物理43：1296-1302，2005
The fracture toughness of liquid-crystalline epoxy systems, which had a nematic polydomain structure (domain size about 40 μm), with an increasing loading rate was evaluated. In this system, the fracture toughness dramatically decreased from 1.96 to 0.22 MN/m3/2 with an increasing loading rate (0.1–5 mm/min). The network orientation near the fracture surface of different loading rate systems was investigated with polarized optical microscopy and polarized infrared spectroscopy. As a result, a large oriented region of mesogenic groups was observed near the fracture surface in the relatively low loading rate (0.1 and 0.5 mm/min) systems, but such a phenomenon was not observed in the high loading rate (2 and 5 mm/min) systems. These results showed that the high fracture toughness of the system at the low loading rate was due to the magnitude and region of the reorientation of the mesogenic groups in the fracture process and that high toughness could not be achieved at a high loading rate because the loading rate was too fast to allow orientation of the networks containing the mesogenic groups. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1296–1302, 2005