Mechanical Performance of Injection‐Molded Poly(propylene): Characterization and Modeling

Erp, van Tb Tim; Govaert, Leon Le; Peters, Gwm Gerrit

doi:10.1002/mame.201200116

Cited by 27 publications

(19 citation statements)

References 32 publications

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“…Flow and cooling conditions are known to largely affect the morphology and therewith the yield kinetics and overall mechanical response [2,3]. Since changes of these processing conditions throughout a product may therefore result in strong spatial variations of mechanical performance [4], an undesired consequence is that weak spots are typically present. In this work a first attempt is made to relate the mechanical properties to the morphology resulting from well-defined processing conditions.…”

mentioning

confidence: 99%

The prediction of mechanical performance of isotactic polypropylene on the basis of processing conditions

Caelers

Govaert

Peters

2016

Polymer

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mentioning

confidence: 99%

The prediction of mechanical performance of isotactic polypropylene on the basis of processing conditions

Caelers

Govaert

Peters

2016

Polymer

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“…Another group is attributed to the microstructure of polymers, for instance the crystal form, the thickness of lamellae, as well as the state of the amorphous phase. By polymer processing, various microstructures and morphologies can be created in the product depending on the individual processing conditions they used [9][10][11]. Therefore, understanding the influence of microstructure on the void formation will be helpful for the establishment of a structure-properties relationship.…”

Section: Cavitation Behavior Of Semi-crystalline Polymersmentioning

confidence: 99%

Cavitation Behavior of Semi-Crystalline Polymers during Uniaxial Stretching Studied by Synchrotron Small-Angle X-Ray Scattering

Chang¹,

Schneider²,

Kuehnert³

et al. 2018

Small Angle Scattering and Diffraction

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Cavitation appears in many semi-crystalline polymers when they are subjected to uniaxial stretching above their glass transition temperatures. Generally, the formation of voids is influenced by the morphology of semi-crystalline polymers, including their lamellae thickness, lamellae orientation, as well as the arrangement of the amorphous phase. Upon stretching, the size of the voids changes as a function of the local strain. Synchrotron small-angle X-ray scattering (SAXS) can be used as a powerful method to in-situ monitor the evolution of voids with high time and spatial resolution. In this chapter, recent reports about the cavitation behavior of semi-crystalline polymers studied by SAXS are reviewed. Afterwards, the theoretical background related to the SAXS technique is introduced. Lastly, some exemplary results about the cavitation behavior of microinjection-molded isotactic-polypropylene, studied by synchrotron SAXS measurements, are presented.

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“…the primary chemical structure of the repeat unit. They also depend upon the lamellar thickness 16,17 and orientation 18,19 of the crystalline phase (if present) and the thermodynamic state of the amorphous phase. 10,20 The effect of thermal treatments on the properties of polymer materials has been researched extensively over the years.…”

Section: -10mentioning

confidence: 99%

Yield stress distribution in injection-moulded glassy polymers

et al. 2015

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How to cite: Verbeeten, W. M., Kanters, M. J., Engels, T. A. and Govaert, L. E. (2015), Yield stress distribution in injection-moulded glassy polymers. Polym. Int., 64(11): 1527-1536. doi: 10.1002 February 25, 2015 AbstractA methodology for structural analysis simulations is presented that incorporates the distribution of mechanical properties along the geometrical dimensions of injection molded amorphous polymer products. It is based on a previously developed modeling approach, where the thermo-mechanical history experienced during processing was used to determine the yield stress at the end of an injection molding cycle. Comparison between experimental data and simulation results showed an excellent quantitative agreement, both for short-term tensile tests, as well as long-term creep experiments over a range of strain rates, applied stresses, and testing temperatures. Changes in mold temperature and component wallthickness, which directly affect the cooling profiles and, hence, the mechanical properties, were well captured by the methodology presented. Furthermore, it turns out that the distribution of the yield stress along a tensile bar is one of the triggers for the onset of (strong) localization generally observed in experiments.

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Mechanical Performance of Injection‐Molded Poly(propylene): Characterization and Modeling

Cited by 27 publications

References 32 publications

The prediction of mechanical performance of isotactic polypropylene on the basis of processing conditions

The prediction of mechanical performance of isotactic polypropylene on the basis of processing conditions

Cavitation Behavior of Semi-Crystalline Polymers during Uniaxial Stretching Studied by Synchrotron Small-Angle X-Ray Scattering

Yield stress distribution in injection-moulded glassy polymers

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