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Effect of Different Shear Modes on Morphology and Mechanical Properties of Polypropylene Pipes Produced by Rotational Shear

Wei-Chen Zhou ,  Zu-Chen Du ,  Hao Yang ,  Jun-Jie Li ,  Ying Zhang ,  Xue-Qin Gao ,  Qiang Fu

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引用本文: . doi: 10.1007/s10118-020-2477-8 shu
Citation:  Wei-Chen Zhou, Zu-Chen Du, Hao Yang, Jun-Jie Li, Ying Zhang, Xue-Qin Gao and Qiang Fu. Effect of Different Shear Modes on Morphology and Mechanical Properties of Polypropylene Pipes Produced by Rotational Shear[J]. Chinese J. Polym. Sci, 2020, 38(12): 1392-1402. doi: 10.1007/s10118-020-2477-8 shu

Effect of Different Shear Modes on Morphology and Mechanical Properties of Polypropylene Pipes Produced by Rotational Shear

摘要: Oriented “shish-kebab” structures could be obtained by shearing to enhance the mechanical properties of polymer samples markedly. However, the effect of shear mode on mechanical properties is still uncertain. The study of stepped hoop shear field on the isotactic polypropylene (iPP) pipe was developed through applying a self-designed rotational shear system (RSS). The effect of stepped shear field on the microstructure and comprehensive properties of iPP pipe was investigated by the comparison with continuous shear. It could be found that the loosely-assembled shish-kebabs with the larger size were formed in the continuous shear pipes, but the smaller and tightly-stacked ones existed in the pipes with stepped shear. Surprisingly, due to differential morphologies under different shear modes, better comprehensive mechanical properties were obtained in the pipes with stepped shear.

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  • Figure 1.  Schematic diagram of RSS[6]: 1-motor, 2-mold, 3-mandrel, 4-coupling, 5-heater, 6-electric box, 7-cooling control, and 8-extruder.

    下载: 全尺寸图片 幻灯片

    Figure 2.  Schematic diagram of continuous and stepped shear modes.

    下载: 全尺寸图片 幻灯片

    Figure 3.  Diagram of iPP pipe with rotational shear test sampling.

    下载: 全尺寸图片 幻灯片

    Figure 4.  (a) Hoop mechanical properties and (b) axial mechanical properties of iPP pipes.

    下载: 全尺寸图片 幻灯片

    Figure 5.  SEM images of axial tensile section under continuous and stepped shear.

    下载: 全尺寸图片 幻灯片

    Figure 6.  Linear WAXD intensity profiles.

    下载: 全尺寸图片 幻灯片

    Figure 7.  Scanning electron micrographs of three layers of the inner, core and outer layers under continuous and stepwise rotational shear (the arrow is the direction of melt flow and the clear shish-kebabs are marked with the dotted boxes).

    下载: 全尺寸图片 幻灯片

    Figure 8.  2D-WAXD patterns of samples with rotational shear (the arrow is the direction of melt flow, and the diffractive rings of (110)α and (040)α are pointed out).

    下载: 全尺寸图片 幻灯片

    Figure 9.  (a) Azimuth scanning map and orientation factor of samples with rotational shear (the azimuthal profile belongs to (040)α); (b) degree of orientation in each layer.

    下载: 全尺寸图片 幻灯片

    Figure 10.  Small angle X-ray scattering pattern (the scattering vectors along and perpendicular to the fiber axis direction are defined as q1 and q2, respectively).

    下载: 全尺寸图片 幻灯片

    Figure 11.  K(z) curve of pipes with different shear modes.

    下载: 全尺寸图片 幻灯片

    Figure 12.  One-dimensional scattering intensity distribution curve of pipes under different shear modes.

    下载: 全尺寸图片 幻灯片

    Figure 13.  Schematic diagram of shish-kebab structure under different shear modes.

    下载: 全尺寸图片 幻灯片
    ModeAverage long period/thickness (nm)
    Shish-kebabKebab
    Continuous22.178.49
    Stepped19.688.10

    Table 1.  Average long period of shish-kebab and average thickness of kebabs in samples with two shear modes.

    下载: 导出CSV
    ModeMelting peak temperature (°C) Melting enthalpy (J/g)
    InnerCoreOuterInnerCoreOuter
    Continuous164.53163.26164.29101.7102103
    Stepped165.77165.38165.48102103.5101.1

    Table 2.  Comparison of DSC test results of iPP pipe.

    下载: 导出CSV
    ModeCrystallinity
    InnerCoreOuter
    Continuous57.46%57.63%58.19%
    Stepped57.65%58.54%57.18%

    Table 3.  Comparison of crystallinity of each layer of iPP pipe.

    下载: 导出CSV
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