Study on the improvement of crystallization of high density polyethylene through dynamic packing injection molding |
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| Authors: | Zhanchun Chen Fan Yang Fei Wu Yanzhou Li Peng Zhang Feng Li |
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| Institution: | 1. School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan, China;2. Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment, Taiyuan, China |
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| Abstract: | To better understand the effect of high‐density polyethylene on crystal morphology under the shear stress field, the dynamic packing injection molding was used to prepare the oriented pure polyethylene. In this present work, dynamic packing injection molding can exert a successive shear field on the melt in the mold cavity during packing stage. The structure of the samples was characterized through differential scanning calorimetry, wide‐angle X‐ray diffraction, and scanning electron microscopy. The oriented lamellae perpendicular to the flow direction can be formed. Oscillating stress between the lower and upper critical values can induce shish forming. The shish kebabs can be generated through sufficient relaxation led by slow cooling and suitable shear. We roughly discuss the relationship between the shear rate and crystal shape. Our results set up a method to reinforce polymer parts by regulating morphology and structure which can be used to do practical processing condition. Copyright © 2016 John Wiley & Sons, Ltd. |
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| Keywords: | crystallization dynamic packing shear stress shear rate oriented structure |
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