Published : 2022-11-17

Influence of chemical foaming on selected properties and structure of injection molded parts made of highly filled with glass fibers PA6

Abstract

The continuous search for engineering materials characterized by high mechanical properties with a simultaneous low density of products prompts to undertake research in the field of further modification of already existing materials. The study analyzed the influence of the chemical blowing process of PA6 with a high content of glass fibers on the structure formation and selected material properties of injection molded samples. Chemical porosity of the unfilled polyamide 6 and PA6 containing 30 and 60 wt.% glass fibers was obtained by the use of the endothermic blowing agent HYDROCEROL® ITP 825 in the amount of 2 wt.%, in relation to the polymer matrix. The density, tensile strength and Charpy impact strength were measured in three areas of the sample. The structural analysis was performed using the SEM scanning electron microscope. The structure of the injected samples varied depending on the distance from the injection point. Along with increasing the distance from the injection point, an increase in the pore size and a more intense foaming process were noted. This effect resulted in a decrease in density and strength properties in the most foamed area. The structure of PA6 GF60 was characterized by the smallest pore size (64 μm in the center area of the molded part) compared to PA6 GF30 and unfilled PA6. However, in the case of PA6 GF60, the foaming process resulted in a significant decrease in specific tensile strength and specific impact strength, which was not observed in the case of unfilled PA6.



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Konczal, N., Nowinka, B., & Bieliński, M. . (2022). Influence of chemical foaming on selected properties and structure of injection molded parts made of highly filled with glass fibers PA6. Polimery, 67(10). https://doi.org/10.14314/polimery.2022.10.1