Abstract
An injection apparatus with a pressure vibration field was self-developed to study the effects of vibration frequency and vibration pressure on the mechanical properties and crystal structure of nylon6 during the process of vibration injection molding. Scanning electron microscope (SEM) and wide-angle X-ray diffraction (WAXD) measurements were conducted. Experimental results showed that the amount of spherulites in subsurface of vibration sample is much more than that of static sample, and the spherulites become more uniformly and perfect. In subsurface layer, vibration induced the change of crystal form from γ-form to α-form. Tensile and impact strength of samples obtained via vibration injection molding were improved, while the elongation decreased.
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