Microdeformation and Fracture Mechanisms in Polyamide-6/Organoclay Nanocomposites
作者： Chaobin He , Tianxi Liu , Wuiwui Chauhari Tjiu , Hung-Jue Sue , Albert F Yee
DOI: 10.1021/MA071781S
关键词: Deformation (engineering) 、 Organoclay 、 Young's modulus 、 Composite material 、 Materials science 、 Nanocomposite 、 Fracture toughness 、 Crazing 、 Brittleness 、 Scanning electron microscope
摘要: A study on the mechanisms for embrittlement of polyamide-6 (PA-6) by nanometer-sized clay in nanocomposites is reported this paper. Tensile modulus and yield strength these composites were found to increase with concentration, while strain at rupture decreased. Similar rupture, fracture toughness also decreased dramatically. Investigation transmission electron microscopy alone indicates that multiple crazing appears be only significant toughening mechanism nanocomposite 2.5 wt % which does not explain why more are significantly brittle. The deformation behavior was therefore further studied using wide (WAXS) small (SAXS) angle X-ray scattering, scanning (SEM), optical microscopy. WAXS detected existence γ-phase PA-6, probably due presence clay. However, occurrence crystalline phase cannot observed changes mechanical behavior. SAXS indica...
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