材料科学
纳米复合材料
复合材料
剥脱关节
环氧树脂
聚合物
模数
磷酸锆
断裂力学
聚合物纳米复合材料
偏转(物理)
磷酸盐
纳米技术
石墨烯
化学
有机化学
物理
光学
作者
Woong J. Boo,Luyi Sun,Jia Liu,Ehsan Moghbelli,Abraham Clearfield,Hung‐Jue Sue,Hoang Pham,Nikhil Verghese
摘要
Abstract By manipulating processing conditions, three levels of exfoliation of synthetic α‐zirconium phosphate (α‐ZrP) nanoplatelets in epoxy matrices have been achieved. Transmission electron microscopy and wide angle X‐ray diffraction were utilized to confirm the three different levels of exfoliation of nanoplatelets in epoxy/α‐ZrP nanocomposites. As expected, it was found that modulus and strength of the nanocomposite are affected by how well the nanoplatelets disperse. It was also found that the operative fracture mechanisms depend strongly on the state of the nanoplatelets dispersion. The crack deflection mechanism, which leads to a tortuous path crack growth, was only observed for poorly dispersed nanocomposites. Delamination of intercalated nanoplatelets and crack deflection were observed in a moderately dispersed system. In the case of fully exfoliated system, the crack only propagated in a straight fashion, which indicates that the fully exfoliated individual nanoplatelet can not affect the propagation of crack at all. The implication of the present findings for structural applications of polymer nanocomposites is discussed. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1459–1469, 2007
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