Creep and recovery behavior of injection-molded isotactic polypropylene with controllable skin-core structure

Wang X, Pan Y, Qin Y, Voigt M, Liu X, Zheng G, Chen Q, Schubert DW, Liu C, Shen C (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Review article

Publication year: 2018

Journal

Polymer Testing Elsevier

Publisher: Elsevier Ltd

Book Volume: 69

Pages Range: 478-484

URI: https://www.sciencedirect.com/science/article/pii/S0142941818304616?via=ihub

DOI: 10.1016/j.polymertesting.2018.05.040

Abstract

The creep behavior is one of the most important properties and should be characterized to evaluate long-term durability and reliability of polymeric materials. An alteration of the crystalline structure and morphology in the semicrystalline polymer leads to a change in the creep behavior as well. In this work, in order to understand the creep behavior of different morphologies, a modified injection molding technology with twice melt filling (M2) was used to prepare isotactic polypropylene (iPP) samples with controllable skin-core structure. The different shear layer thicknesses were obtained by adjusting the time intervals of the twice melt filling. Compared with the conventional injection-molded samples (M1), M2 samples present better efficiencies in reducing the creep and recovery response, and the response was strongly influenced by the shear layer thicknesses. For example, the thickness of skin layer of M2 sample with a time interval of 9 s increased approximately 42% and its creep deformation reduced to 52% at 80 °C. It was also found that the creep and recovery strain reduced with decreased temperature or with applied stress. In addition, several theoretical models were used to describe the creep and recovery behavior of M2 samples for a better understanding of the mechanisms.

Authors with CRIS profile

Yamin Pan Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) Yijing Qin Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) Monika Voigt Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) Dirk Schubert Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)

Involved external institutions

Zhengzhou University / 郑州大学 CN China (CN) Northwestern Polytechnical University / 西北工业大学 (NPU/NWPU) CN China (CN)

How to cite

APA:

Wang, X., Pan, Y., Qin, Y., Voigt, M., Liu, X., Zheng, G.,... Shen, C. (2018). Creep and recovery behavior of injection-molded isotactic polypropylene with controllable skin-core structure. Polymer Testing, 69, 478-484. https://dx.doi.org/10.1016/j.polymertesting.2018.05.040

MLA:

Wang, Xin, et al. "Creep and recovery behavior of injection-molded isotactic polypropylene with controllable skin-core structure." Polymer Testing 69 (2018): 478-484.

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