Electron‐microscopical investigation of the morphology of segmented polyurethanes

Foks, J.; Michler, Goerg H.

doi:10.1002/app.1986.070310514

Cited by 31 publications

(16 citation statements)

References 21 publications

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“…Visual investigation of TPU raw material before melt processing, performed by LM, shows presence of spherulitic structures with diameter of 10–25 µm, homogenously dispersed in the TPU matrix. This suggests a distinct phase separation of HS from SS matrix12 due to intermolecular interactions between polar HS. SEM investigation confirms those observations.…”

Section: Resultsmentioning

confidence: 91%

Process Induced Micro Structure Evolution in Polyester Polyurethane and Mechanical Properties Relationship

Frick

Mikoszek

2012

Macromolecular Symposia

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Summary: MDI‐HQEE‐Capa based thermoplastic polyurethane (TPU) with Shore hardness of 94 A was injection molded. In order to study the influence of melt conditions on the material structure evolution and resulting mechanical properties a systematical variation in processing temperatures in the range between 195 °C and 250 °C was applied. The mold temperature was kept constant at 60 °C. Process induced samples morphologies were investigated by means of light microscope (LM), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). Mechanical visco‐elastic properties were determined by means of cyclic tensile experiment and were correlated with results of structural investigations. The evaluation of morphology micrographs of raw TPU material and specimens molded at different temperatures shows a reduction in visual crystalline fraction. This gains a distinct change in the deformation behavior of injection molded TPU with increasing melt processing temperature.

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Section: Resultsmentioning

confidence: 91%

Process Induced Micro Structure Evolution in Polyester Polyurethane and Mechanical Properties Relationship

Frick

Mikoszek

2012

Macromolecular Symposia

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“…[8] The dilatation and contraction of radial fibrils accounted for this but there was no detailed information about the degradation of particular segments.…”

Section: Introductionmentioning

confidence: 99%

Electron‐Beam Irradiation in TEM of Hard‐Segment Homopolymers and Polyurethanes with Different Hard‐Segment Content

Janik

2004

Macromol. Rapid Commun.

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Summary: A hard‐segment homopolymer (HSH) and segmented poly(ester urethanes) (PESU) were studied by TEM to estimate their stability against electron‐beam irradiation. The bright‐field image and electron‐diffraction modes in TEM and optical polarised microscopy were used. It is shown that both soft and hard segments are sensitive to the electron beam. None of the films was stable enough to register an electron‐diffraction pattern without damage.Electron‐diffraction pattern taken from the film of hard‐segment homopolymer crystallised at 100 °C from DMF: (a) the pattern registered immediately; (b) the pattern registered after 5 s of exposure in the TEM at the same place.imageElectron‐diffraction pattern taken from the film of hard‐segment homopolymer crystallised at 100 °C from DMF: (a) the pattern registered immediately; (b) the pattern registered after 5 s of exposure in the TEM at the same place.

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“…It need to research the structure development and to understand it's consequences. Therefore every study on the mechanical properties should be coupled with a detailed investigation on morphology 3–5…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Melt Processing on Segmented Polyurethanes Morphology

Frick

Mikoszek

2010

Macromolecular Symposia

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A study on thermoplastic polyurethanes (TPU) is described. The investigation focuses on morphology of TPU parts depending on processing conditions and its relation with mechanical and thermal properties. It was found that TPU materials present different crystalline structures depending on chemical composition and melt processing conditions during part manufacturing. Due to that fact, strong variations in mechanical and tribological properties are expected.

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Electron‐microscopical investigation of the morphology of segmented polyurethanes

Cited by 31 publications

References 21 publications

Process Induced Micro Structure Evolution in Polyester Polyurethane and Mechanical Properties Relationship

Process Induced Micro Structure Evolution in Polyester Polyurethane and Mechanical Properties Relationship

Electron‐Beam Irradiation in TEM of Hard‐Segment Homopolymers and Polyurethanes with Different Hard‐Segment Content

Study on the Influence of Melt Processing on Segmented Polyurethanes Morphology

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