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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical properties and fracture behavior of high-performance epoxy nanocomposites modified with block polymer and core-shell rubber particles
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Mechanical properties and fracture behavior of high-performance epoxy nanocomposites modified with block polymer and core-shell rubber particles

机译：用嵌段聚合物和芯壳橡胶颗粒改性高性能环氧纳米复合材料的力学性能和断裂行为

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摘要

The mechanical properties, thermomechanical properties, and fracture mechanic properties of block-copolymer (BCP), core-shell rubber (CSR) particles, and their hybrids in bulk epoxy/anhydride system were investigated at 23 degrees C. The results show that fracture toughness was increased by more than 268% for 10 wt % BCP, 200% for 12 wt % of CSR particles, and 100% for hybrid systems containing 3 wt % of each, BCP and CSR. The volume content of nanoparticles influences the final morphology and thus influences the tensile properties and fracture toughness of the modified systems. The toughening mechanisms induced by the BCP and CSR particles were identified as (1) localized plastic shear-band yielding around the particles and (2) cavitation of the particles followed by plastic void growth in the epoxy polymer. These mechanisms were modeled using the Hsieh et al. approach and the values of GIc of the different modified systems were calculated. Excellent agreement was found between the predicted and the experimentally measured fracture energies. (c) 2019 Wiley Periodicals, Inc.
机译：在23摄氏度下研究了嵌段共聚物（BCP），核 - 壳橡胶（CSR）颗粒的机械性能，热机械性能和骨折机械性能及其在本体环氧/酐系统中的杂种。结果表明骨折韧性10wt％BCP的增长超过268％，200％占CSR颗粒的12wt％，含有每种，BCP和CSR的3wt％的杂化系统100％。纳米粒子的体积含量影响最终的形态，从而影响改性系统的拉伸性能和断裂韧性。由BCP和CSR颗粒诱导的增韧机制被鉴定为（1）局部化的塑料剪切带，其围绕颗粒和（2）颗粒的空化，然后在环氧聚合物中进行塑性空隙生长。使用HSIEH等人进行建模这些机制。计算了不同修改系统的方法的方法和值。在预测和实验测量的骨折能量之间发现了良好的协议。 （c）2019 Wiley期刊，Inc。

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