Abstract
In this study, the relationship between skin structure and shear strength distribution of thin-wall injection molded polypropylene (PP) molded at different molecular weight and molecular distribution was investigated. Skin-core structure, cross-sectional morphology, crystallinity, crystal orientation, crystal morphology and molecular orientation were evaluated by using polarized optical microscope, differential scanning calorimeter, X-ray spectroscopic analyzer and laser Raman spectroscopy, respectively, while the shear strength distribution was investigated using a micro cutting method called SAICAS (Surface And Interfacial Cutting Analysis System). The results indicated that the difference of molecular weight and molecular weight distribution showed own skin layer thickness. Especially, high molecular weight sample showed thicker layer of the lamellar orientation and molecular orientation than low molecular weight sample. In addition, wide molecular distribution sample showed large crystal orientation layer.
Highlights
Injection molding is one of the most used methods to make plastic products
The skin-core structures were characterized in terms of morphology, crystallinity, crystal phase, lamellar and molecular orientation by using optical microscope, differential scanning calorimeter, laser Raman spectroscopy, small angle X-ray scatting and wide angle X-ray diffraction
Skin-Core Morphology Figure 2 shows skin-core morphology of injection molded PP with different molecular weight and molecular weight distribution observed by polarized optical microscope (POM)
Summary
Injection molding is one of the most used methods to make plastic products. The parts made by this technique were used in various situations such as transportation equipment, electric appliance, and supplies. Effect of β phase crystalline nucleating agent added polypropylene (PP) [7] and influence of ultra-high speed injection molding [8] were studied to reveal the relationship between non-uniform structure and property of thin-wall injection molding products. This non-uniform structure-property relationship was investigated in composite material [9] and non-olefin resin based materials [10]. The relationship between skin-core structure and property distribution of thin-wall injection molded polypropylene with different molecular weight and molecular weight distribution was investigated. The property distribution of shear strength was measured by micro cutting machine
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