Micro-FTIR Study of Molecular Orientation at Crack Tip in Nylon 6/Clay Nanocomposite: Insight into Fracture Mechanism

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• 作者：Wenfei Xu ; Ruihua Lv ; Bing Na ; Nana Tian ; Zhujun Li ; Qiang Fu
• 刊名：Journal of Physical Chemistry B
• 出版年：2009
• 出版时间：July 23, 2009
• 年：2009
• 卷：113
• 期：29
• 页码：9664-9668
• 全文大小：227K
• 年卷期：v.113,no.29(July 23, 2009)
• ISSN：1520-5207

文摘

A study on the mechanism for the degraded toughness in nylon 6/clay nanocomposite is explored in this Article. Such a nanocomposite exhibits lower specific essential work of fracture w_e and specific nonessential work of fracture βw_p than its pure nylon 6 counterpart, as revealed by essential work of fracture (EWF) measurements. Furthermore, the molecular orientation in a small region (20 × 20 μm²) ahead of crack tip, obtained from micro-FTIR measurements for the first time, is found to be lower in the nanocomposite during crack initiation and propagation. The decreased molecular orientation, mostly resulted from severe microvoiding at crack tips, is responsible for the reduced specific essential work of fracture w_e. Meanwhile, the molecular orientation around crack tip also indicates that lower plastic deformation occurs in the plastic zone, which is well correlated with decreased specific nonessential work of fracture βw_p in the nanocomposite.