Morphological characterization of semi-crystalline POM using nanoindentation

Christöfl, Petra; Czibula, Caterina; Seidlhofer, Tristan; Berer, Michael; Macher, Astrid; Helfer, Eric; Schrank, Theresia; Teichert, Christian; Pinter, Gerald

doi:10.1080/1023666x.2021.1968122

Cited by 10 publications

(2 citation statements)

References 35 publications

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“…Nanoindentation is most often used for the characterization of polymers considered homogeneous such as amorphous polymers like PMMA [22][23][24][25], PC [24,26], or PS [24]. For semi-crystalline polymers, nanoindentation was used on commercial samples prepared by conventional manufacturing processes, such as injection molding or extrusion, that usually induce a microstructure gradient between the skin and the core of the sample [27][28][29][30][31][32][33]. These studies aimed to evaluate the mechanical response in the different zones (skin-transition-core layers) of the prepared sample.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

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Intraspherulitic mechanical heterogeneities and microstructure of i-PP highlighted by nanoindentation and atomic force microscopy

Grondin,

Smerdova,

Castagnet

et al. 2023

Polymer

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Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…Indeed, one of the limitations of using nanoindentation is the need for a flat and smooth surface. Thus, most of the cited authors polish surfaces to ensure their suitability for nanoindentation [27,28,33,34,36,37]. However, polishing erases a layer of material and partially destroys the microstructure.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Intraspherulitic mechanical heterogeneities and microstructure of i-PP highlighted by nanoindentation and atomic force microscopy

Grondin,

Smerdova,

Castagnet

et al. 2023

Polymer

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The Effects of Shear Stress on the Micromechanical Properties of 3D Printable Biopolymer Nanocomposites Using a Custom‐Designed Extrusion‐Based 3D Printer

Hashemi,

Mondal,

Patil

et al. 2024

Adv Eng Mater

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Current advancements in 3D printing technology have the potential to facilitate the production of scaffolds and implants for various biomedical applications, including bone repair and regeneration. 3D printed patient‐specific bone‐inspired nanocomposite grafts might be a viable alternative to current bone repair treatment methods if they provide appropriate anatomic structure, biocompatibility, and adequate mechanical properties. In the current work, a 3D printable nanocomposite biomaterial ink with bone cell biocompatibility (in vitro) is printed while adjusting shear stress during extrusion using a custom‐designed 3D printer to investigate the shear stress effect on the mechanical properties of the 3D printed nanocomposite. Tensile test results, as well as polarized light microscopy and differential scanning calorimetry analyses, reveal that increasing the applied shear stress from 3.5 to 14 kPa during extrusion‐based 3D printing in a custom‐built 3D printer, increased the strength, tensile modulus, and toughness of printed nanocomposite filaments by about three‐fold. This improvement is attributed to increased crystallinity in the thermoset biopolymer matrix due to the higher shear stress and the nano‐confinement effect. This implies that greater shear during layer‐by‐layer extrusion‐based 3D printing might be employed to create more robust mechanically competent 3D printed nanocomposite bone grafts.

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Nanoindentation for Fast Investigation of PET Film Degradation

Christöfl

Ottersböck

Czibula

et al. 2022

JOM

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The lifetime of industrial polymer products is in many cases limited by aging. Therefore, it is necessary to develop a fast and sensitive method to detect polymer aging at an early stage. A commercially available 50-µm-thick and transparent polyethylene terephtalate (PET) film was aged under different artificial conditions, and the evolution of mechanical properties with increasing aging time was investigated via nanoindentation (NI) and tensile testing. Chemical aging was studied with gel permeation chromatography (GPC), and physical aging was monitored by the first heating of differential scanning calorimetry. NI data evaluated with the method of Oliver and Pharr was compared to tensile test data with good agreement between the results on the macro- and nanoscales. Furthermore, a correlation between NI creep data and GPC data was obtained, which indicates that the aging of the PET films primarily originated from chemical aging. This study states that NI is an appropriate method to determine degradation of PET at an early stage.

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Morphological characterization of semi-crystalline POM using nanoindentation

Cited by 10 publications

References 35 publications

Intraspherulitic mechanical heterogeneities and microstructure of i-PP highlighted by nanoindentation and atomic force microscopy

Intraspherulitic mechanical heterogeneities and microstructure of i-PP highlighted by nanoindentation and atomic force microscopy

The Effects of Shear Stress on the Micromechanical Properties of 3D Printable Biopolymer Nanocomposites Using a Custom‐Designed Extrusion‐Based 3D Printer

Nanoindentation for Fast Investigation of PET Film Degradation

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