Individual and Combined Roles of CTBN and Fly Ash in Epoxy System under Compression: Correlation between Microscopic Features and Mechanical Behavior
Individual and Combined Roles of CTBN and Fly Ash in Epoxy System under Compression: Correlation between Microscopic Features and Mechanical Behavior
复制标题
CTBN 和粉煤灰在压缩环氧体系中的单独和组合作用：微观特征与机械行为之间的相关性
DOI：
10.1177/0731684405043557
复制
发表时间：
2005
影响因子：
3.1
通讯作者：
S. Santra
中科院分区：
文献类型：
--
作者：
Kishore;S. Santra
分别浇注了以飞灰或聚(丙烯腈-丁二烯)、端羧基丁二烯(CTBN)为单一增强材料的环氧树脂，以及作为混杂增强材料的两种填充材料在体系中的浇注，并对固化后的试件进行了轴向抗压强度试验。通过改变复合材料中填料的比例，研究了不同特性的填料对复合材料性能的影响。不变形、含氧化物的陶瓷型飞灰掺入环氧树脂后，其抗压强度随着飞灰含量的增加而增加，当飞灰含量增加到10%时，抗压强度有所下降。在CTBN的情况下，注意到重量上升高达5%的趋势。当同时引入两种填料时，在由两种填料的等量组成的组合物中记录到最大强度，该组合物的总重量为5%。这项工作扩展到微观检查，检查了填料的形态、基质-填料界面区域的作用以及两种填料作为单独增强体存在时所起的作用。观察到了飞灰和CTBN的剪切变形、阶梯状、裂纹钝化和橡胶相伸长、裂纹钉扎以及在飞灰和CTBN周围形成骨质等特征。这项工作试图将机械数据与微观细节联系起来。因此，较高水平的弹性体(按重量计为10%和20%)的强度下降可以追溯到粒子的结合。在这些体系中，最初注意到的强度上升可能与粘结良好的弹性体填料提供的抗变形能力有关。
Epoxy containing fillers of either fly ash or poly(acrylonitrile-co-butadiene), carboxy terminated (CTBN) as single reinforcing material in one program and both the filler materials as hybrid reinforcements into the system in the second were cast and the test coupons cut from the cured slabs were subjected to axial compression strength. The filler proportions in the composites were varied with a view to study the effects of differing characteristics bearing filler materials. The nondeforming, oxide bearing ceramic-type fly ash when incorporated into epoxy showed an increase in compressive strength values with fly ash content up to 10% by weight inclusion after which a drop was noticed. In the case of CTBN, the trend of recording a rise was noticed up to 5% by weight. When the two fillers were introduced simultaneously, the maximum in strength was recorded at a composition constituted by equal amounts of both the fillers comprising a total of 5% by weight. The work was extended to microscopic examination where features like morphology of fillers, the role of matrix-filler interface region as well as the part played by the two fillers when they are present as individual reinforcements were examined. Features such as shear deformation, stepped-appearance, crack blunting and elongation of the rubbery phase, crack pinning, and formation of debonds around the fly ash and CTBN were noticed. The work attempts at correlating the mechanical data to microscopic details. Thus, the drop in strength at higher levels of elastomers (10 and 20% by weight) could be traced to the coalescing of particles. The initial rise in strength noticed in these systems, could be related to the resistance to deformation offered by the well-bonded elastomeric fillers.