Toughening of a brittle thermosetting polymer: Effects of reinforcement particle size and volume fraction
Toughening of a brittle thermosetting polymer: Effects of reinforcement particle size and volume fraction
复制标题
DOI：
10.1023/a:1013844015493
复制
发表时间：
2002-02
影响因子：
4.5
通讯作者：
Rahul Singh;M. Zhang;D. Chan
中科院分区：
文献类型：
--
作者：
Rahul Singh;M. Zhang;D. Chan
微米和纳米尺寸的铝颗粒被用作增强材料，以提高断裂韧性的高度交联的，名义上脆性的，热固性不饱和聚酯树脂。系统地改变颗粒尺寸和颗粒体积分数，以研究它们对断裂行为和断裂韧性的影响。据观察，在一般情况下，整体断裂韧性单调增加的铝颗粒的体积分数，对于一个给定的颗粒尺寸，提供颗粒分散和解聚保持。复合材料的断裂韧性也受到增强颗粒尺寸的强烈影响。对于给定的颗粒体积分数，较小的颗粒导致断裂韧性的较大增加。断口扫描电子显微镜建立裂纹前端捕获作为主要的外在增韧机制。最后，还研究了颗粒体积分数和粒径对聚酯-铝复合材料拉伸性能的影响。测得的弹性模量符合混合律。同时，在聚酯基体中包含铝颗粒后，拉伸强度略有降低。
Micron- and nanometer-sized aluminum particles were used as reinforcements to enhance the fracture toughness of a highly-crosslinked, nominally brittle, thermosetting unsaturated polyester resin. Both particle size and particle volume fraction were systematically varied to investigate their effects on the fracture behavior and the fracture toughness. It was observed that, in general, the overall fracture toughness increased monotonically with the volume fraction of aluminum particles, for a given particle size, provided particle dispersion and deagglomeration was maintained. The fracture toughness of the composite was also strongly influenced by the size of the reinforcement particles. Smaller particles led to a greater increase in fracture toughness for a given particle volume fraction. Scanning electron microscopy of the fracture surfaces was employed to establish crack front trapping as the primary extrinsic toughening mechanism. Finally, the effects of particle volume fraction and size on the tensile properties of the polyester-aluminum composite were also investigated. The measured elastic modulus was in accordance with the rule-of-mixtures. Meanwhile, the tensile strength was slightly reduced upon the inclusion of aluminum particles in the polyester matrix.