Structure and Properties of Vibrating Extruded High-Density Polyethylene Sheet |
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Authors: | Qin Xuemei Qu Jinping Cao Xianwu |
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Affiliation: | (1) National Engineering Research Center of Novel Equipment for Polymer Processing, The Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China Univ. of Tech., Guangzhou, 510640, China |
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Abstract: | Summary The effect of vibration frequency and vibration amplitude on the microstructure and mechanical properties of high-density
polyethylene (HDPE) sheets, obtained through electromagnetic dynamic plasticating extruder, were studied systematically. The
mechanical properties, characterized by tensile and impact strengths, have been tested along the flowing and transverse directions
(MD&TD). The mechanical tests show that the tensile strength and impact toughness, especially in TD, were much improved under
the reciprocating axial vibration. Differential scanning calorimetry (DSC), scanning electron microcopy (SEM) and wide angle
X-ray diffraction (WAXD) were executed to analyze the microstructure of the samples. The results indicate that the vibration
extrudate has higher crystallinity, perfect crystallite, and strong inter-spherulite ties, which account for enhancement of
the mechanical properties of sheets, compared to conventional static extrusion. |
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Keywords: | vibration plasticating extrusion high-density polyethylene microstructure mechanical properties |
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