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首页> 外文期刊>Journal of Applied Polymer Science >Lap Shear Strength and Thermal Stability of Diglycidyl Ether of Bisphenol A/Epoxy Novolac Adhesives with Nanoreinforcing Fillers
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Lap Shear Strength and Thermal Stability of Diglycidyl Ether of Bisphenol A/Epoxy Novolac Adhesives with Nanoreinforcing Fillers

机译：含纳米补强剂的双酚A /环氧酚醛清漆胶的二缩水甘油醚的搭接剪切强度和热稳定性

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摘要

Nanoreinforcing fillers have shown outstanding mechanical properties and widely used as reinforcing materials associated to polymeric matrices for high performance applications. In this study, a series of multiwalled carbon nanotubes (MWCNTs)-, nano-Al_2O_3-, nano-SiO_2-, and talc-reinforced epoxy resin adhesives composites were developed. The influence of different types and contents of nanofillers on adhesion, elongation at break, and thermal stability (under air and nitrogen atmospheres) of diglycidyl ether of bisphenol A (DGEBA)/epoxy novolac adhesives was investigated. A simple and effective approach to prepare adhesives with uniform and suitable dispersion of nanofillers into epoxy matrix was found to be mechanical stirring combined with ultrasonication. Transmission electron microscopic and scanning electron microscopic investigations revealed that nanofillers were homogeneously dispersed in epoxy matrix at optimized nanofiller loadings. Adhesion strength was measured by lap shear strength test as a function of nano-Al_2O_3 and MWCNTs loadings. The results indicated that the lap shear strength was significantly increased by about 50% and 70% with addition of MWCNTs and nano-Al_2O_3 up to a certain level, respectively. The highest lap shear strength was reached at 1.5 wt % of nano-Al_2O_3 loading. MWCNTs at all loadings (except 3 wt %) and nano-Al_2O_3 have enhanced onset of degradation temperature and char yield of the adhesives. By combined incorporation of 0.75 wt % nano-Al_2O_3 and 0.75 wt % MWCNTs into the epoxy novolac/DGEBA blend adhesives a synergistic effect was observed in the thermal stability of the adhesives at high temperatures (800℃).
机译：纳米增强填料已显示出出色的机械性能，并广泛用作与聚合物基质相关的增强材料，以用于高性能应用。在这项研究中，开发了一系列的多壁碳纳米管（MWCNTs），纳米Al_2O_3，纳米SiO_2和滑石粉增强环氧树脂胶粘剂复合材料。研究了不同类型和含量的纳米填料对双酚A（DGEBA）/环氧酚醛清漆胶粘剂的缩水甘油醚的粘合力，断裂伸长率和热稳定性（在空气和氮气气氛下）的影响。发现一种简单有效的方法，是将机械填充剂均匀混合并适当分散在环氧树脂基质中，这是机械搅拌与超声处理相结合的方法。透射电子显微镜和扫描电子显微镜研究表明，纳米填料以最佳的纳米填料负载均匀地分散在环氧基质中。通过搭接剪切强度测试测量粘合强度作为纳米Al_2O_3和MWCNTs负载的函数。结果表明，添加MWCNTs和纳米Al_2O_3达到一定水平，搭接剪切强度分别显着提高了约50％和70％。在纳米Al_2O_3负载量的1.5 wt％时达到最高的搭接剪切强度。在所有负载下（3 wt％除外）和纳米Al_2O_3，MWCNTs的降解温度和炭的收率都得到了提高。通过将0.75 wt％的纳米Al_2O_3和0.75 wt％的MWCNTs结合掺入环氧线型酚醛清漆/ DGEBA共混粘合剂中，在高温（800℃）下，粘合剂的热稳定性得到了协同作用。

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