Rheology,Crystallization, Mechanical and Barrier Properties of Polyamide 6/66 Nanocomposites with Exfoliated Organoclays |
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| Authors: | Xiaochao Liu Jianhong Chen Long Mao Jun Yang |
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| Institution: | 1. Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, Hunan University of Technology, Zhuzhou, Hunan, China;2. School of Materials Science and Technology, Xiamen University of Technology, Xiamen, Fujian, China;3. School of Materials Science and Technology, Xiamen University of Technology, Xiamen, Fujian, China;4. Technology R&5. D Center Zhuzhou Times New Material Technology Co., Ltd, Zhuzhou, Hunan, China |
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| Abstract: | Nylon copolymer/clay (NC) nanocomposites were prepared using PA6/66 as a matrix and organoclay as a nanofiller through a two-step melt-compounding method. It was shown that the organoclay flakes were well exfoliated and dispersed in the PA6/66 matrix. With increasing content of organoclay, the apparent shear viscosity and the entrance pressure drop of the NC nanocomposites decreased whereas the corresponding shear activation energy increased, suggesting that the NC nanocomposites were suitable to be used in shear-flow rather than extension-flow related processes. Investigations of the crystallization behaviors of the NC nanocomposites indicated that the organoclay addition was capable of facilitating the γ-form crystal formation, which is suggested to be due to the restriction effect of the organoclay on the PA6/66 chain motion during the crystallization. Compared to the neat PA6/66, the tensile strength and elongation at break of the NC nanocomposites were both enhanced at an appropriate content of the organoclay. In addition, the NC nanocomposites exhibited enhanced barrier properties due to the high specific surface area and the homogeneous dispersion of the organoclay. |
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| Keywords: | Barrier properties clay crystallization mechanical properties PA6/66 nanocomposite rheology |
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