| Polyamide 6 is a kind of extensively used engineering plastics, but the usage is limited by some drawbacks, such as brittleness and low heat distortion temperature. Usually blending with a elastic phase could improve the toughness of Polyamide 6, and the toughening mechanism is not only related to rubber content and particle size, also related to the shape of particles and the particle size distribution. Incorporating with rubber could achieve satisfying toughness but results in a decreased the modulus and tensile strength. While compounding with organoclay could enhance the modulus and stiffness but decrease the toughness. In order to achieve satisfying balanced properties, ternary nanocomposites have attracted great attention. In this paper, low shear stress field was introduced during dynamic packing injection molding to control the phase morphology of blends, at last the stretched and oriented rubber particles were obtained and the toughening mechanism under this kind of phase morphology was studied. Furthermore, the effect of organoclay content on the toughening mechanism of ternary nanocomposites and the effect of organoclay on the reinforcing mechanism of ternary nanocomposites under different rubber content were studied. The main results are:1. The impact strength of specimens obtained by DPIM was found substantially increase at all the blends investigated, compared with the one obtained via conventional injection molding. Particularly, more than 30kJ/m~2 increase of the impact strength was observed for specimens with a higher rubber content (more than 15wt %). SEM results showed a remarkably decrease of rubber particle size and... |
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