Micro-mechanical deformation mechanisms in the fracture of hybrid-particulate composites based on glass beads, rubber and epoxies
Micro-mechanical deformation mechanisms in the fracture of hybrid-particulate composites based on glass beads, rubber and epoxies
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DOI：
10.1002/pen.11377
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发表时间：
2000-12
影响因子：
3.2
通讯作者：
Jonghwi Lee;A. Yee
中科院分区：
文献类型：
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作者：
Jonghwi Lee;A. Yee
采用玻璃微珠和端羧基丁腈共聚物（CTBN）两种增韧剂对环氧热固性树脂进行增韧改性。使用橡胶封装的玻璃珠，并将含有它们的混合颗粒复合材料与含有非封装的玻璃珠的混合颗粒复合材料进行比较。在一定的组成范围内，发现橡胶包覆改变了玻璃微珠和CTBN颗粒之间的相互作用，导致断裂韧性增加。增韧效果是由以下事实来解释的，即CTBN颗粒的空腔在封装系统中比在非封装系统中更大。随着更多的CTBN颗粒被引入到玻璃珠填充的环氧树脂中，CTBN颗粒的空化/剪切屈服机制取代玻璃珠的微剪切带机制作为主要的微观机械变形。橡胶封装似乎使这种主要的微观机械变形的转变发生在较低的体积分数的CTBN。
Two tougheners, glass beads and carboxyl terminated butadiene acrylonitrile copolymer (CTBN), are used to toughen and stiffen an epoxy thermoset. Rubber-encapsulated glass beads are used and the hybrid particulate composites containing them are compared with those containing non-encapsulated glass beads. Within a certain range of composition, the rubber encapsulation is found to change the interactions between glass beads and CTBN particles, resulting in an increase in fracture toughness. The toughening effect is explained by the fact that the cavities of CTBN particles are larger in encapsulation systems than in non-encapsulation systems. As more CTBN particles are incorporated into glass bead filled epoxies, the cavitation/shear yielding mechanism of CTBN particles replaces the micro-shear banding mechanism of glass beads as the major micro-mechanical deformation. Rubber encapsulation seems to enable this transition of major micro-mechanical deformation to occur at a lower volume fraction of CTBN.