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Department of Chemistry
Hornluftdosierung an einer Spritzpistole im Praktikum Lackapplikation Show image information
Kolorierte Rasterelektronenmikroskopaufnahme eines Effektpigmentes Show image information
Mittels des PeakForce QNM-Messmodus lassen sich nanomechanische Eigenschaften am Rasterkraftmikroskop ermitteln. Show image information
Kolorierte Rasterelektronenmikroskopaufnahme einer mmonodispersen Polymerdispersion Show image information
Probenwechsel unter dem Infrarotstrahler Show image information
Ermittlung der Kornfeinheit mittels Grindometer im Praktikum Show image information

Hornluftdosierung an einer Spritzpistole im Praktikum Lackapplikation

Photo: Irina Regehr, CMP, Universität Paderborn

Kolorierte Rasterelektronenmikroskopaufnahme eines Effektpigmentes

Photo: Nadine Buitkamp, CMP, Universität Paderborn

Mittels des PeakForce QNM-Messmodus lassen sich nanomechanische Eigenschaften am Rasterkraftmikroskop ermitteln.

Photo: Irina Regehr, CMP, Universität Paderborn

Kolorierte Rasterelektronenmikroskopaufnahme einer mmonodispersen Polymerdispersion

Photo: Nadine Buitkamp, CMP, Universität Paderborn

Probenwechsel unter dem Infrarotstrahler

Photo: Irina Regehr, CMP, Universität Paderborn

Ermittlung der Kornfeinheit mittels Grindometer im Praktikum

Photo: Irina Regehr, CMP, Universität Paderborn

Coating Materials & Polymers
Prof. Dr. Wolfgang Bremser

Melamine resins

Background and aims

Self structuring polymer materials in the nano or micro scale have become essential for coating and plastics applications. This includes the so-called nanoparticles as well as the inorganic/organic hybrid materials. The applications of nanoparticles are as varied as the particles themselves. Thus titanium dioxide or aluminium oxide nanoparticles are used in cosmetic products such as sunscreens, toothpaste or deodorant. In nanoelectronics, carbon nanotubes can form new logic circuits.

The aim of the project is the synthesis, the modification and characterization of melamine nanoparticles. The nanoparticles are incorporated in carious coating systems to achieve a desired property profile of the coating

Results

By acid-catalysed condensation of hexamethoxymethylolmelamin (HMMM), the production of nanoparticles with different sizes is possible. The growth of the particles is monitored by means of light scattering. The particle size decreases with increasing catalyst concentration. By atomic force microscopy (AFM) and transmission electron microscopy novel platelet-shaped nanoparticles are detected. Molecular modelling experiments have confirmed a coplanar polymerization. The particles can be stabilized by the addition of additives and incorporated into coating systems.

Figure 1 Atomic force microscope (AFM) image platelet-shaped HMMM nanoparticles.Visible are 100 nm wide nanoparticles (yellow) with a height of 30 nm, which can be determined based on the color scale.
Figure 2 Coplanar polymerization of HMMM (simulation with MOE) as a starting point for platelet-shaped nanoparticles

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