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Effect of Multi-Level Microstructure on Local and Bulk Mechanical Properties in Micro-Injection Molded PC/PET Blend

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Abstract

This study introduces a method to investigate the relationship between the multi-level microstructures and mechanical properties of polymer blends prepared by micro-injection molding (µIM). Special morphological features were systematically researched. Polycarbonate (PC), poly(ethylene terephthalate) (PET), and PC/PET microparts all exhibit typical “skin-core” morphologies. The thickness of the core layer is much greater than that of the skin layer, and the thickness of the skin layer gradually decreases along the flow direction. Photoacoustic Fourier transform infrared spectroscopy records reveal that the PC molecular chain has the biggest orientation degree, followed by PC/PET and PET chains under the same µIM processing conditions. Moreover, the molecular chains orientation in the skin layer is more than 50% that in the core layer. Nanoindentation tests are conducted to study local mechanical properties. The higher modulus in the shear layer is affected to a greater extent by high shear action in comparison with the frozen and core layers. Uniaxial tensile testing demonstrates that the tensile strength of PC/PET micropart is 15.5% higher than that of the PET micropart, while the toughness is 16% higher than that of the PC microparts. In-situ, high- speed tensile imaging, combined with scanning electron microscopy micrographs of the fracture section, are used to study the fracture behaviors of the microparts. The results gathered in this paper may provide a theoretical basis and data to support the feasibility and efficiency of micro-injection molded polymer blends.

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Authors and Affiliations

  1. School of Mechatronics and Mold Engineering, Taizhou Vocational College of Science & Technology, Taizhou, Zhejiang, 318000, P. R. China

    Jianping Ren

  2. School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, P. R. China

    Jing Jiang

  3. National Center for International Joint research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou, Henan, 450001, P. R. China

    Jianping Ren, Jing Jiang, Zihui Li, Jianhua Hou & Qian Li

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  1. Jianping Ren
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  2. Jing Jiang
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  3. Zihui Li
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  4. Jianhua Hou
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  5. Qian Li
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Correspondence to Jing Jiang.

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Supporting information

Informations are available regarding the experimental procedure and characterization for the molding window for µIM process (Figure S1), FTIR measurment (Figure S2), and tensile datas for microparts (Table S1). The materials are available via the Internet at http://www.springer.com/13233.

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Acknowledgment: The authors would like to express their gratitude to the School-enterprise Cooperation Project for domestic visiting engineers in colleges and universities in 2019 (FG2019217) and base of discipline innovation in Henan higher schools support. This work is also sponsored by the National Science Fund (11372286) and technological research project of Henan Province (202102210028).

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Ren, J., Jiang, J., Li, Z. et al. Effect of Multi-Level Microstructure on Local and Bulk Mechanical Properties in Micro-Injection Molded PC/PET Blend. Macromol. Res. 28, 939–947 (2020). https://doi.org/10.1007/s13233-020-8117-x

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  • DOI: https://doi.org/10.1007/s13233-020-8117-x

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