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Z. Członkowska-Kohutnicka, M. Zielonka, D. Wilson-Polit, R. Kwiatkowski, J. Sobczak, I. Leszczyńska, J. Kozakiewicz, A. Winiarska

Properties of the solutions and coatings of microgels containing polysiloxaneurethane prepolymers

Polimery 2003, No 11-12, 800


DOI: dx.doi.org/10.14314/polimery.2003.800


Summary

The solutions and coatings of microgels containing polysiloxaneurethane (PSU) prepolymers. This prepolymers were based on PUR made of various polyoxypropylenepolyols and isocyanates or oligosiloxanes containing hydroxyalkyl end groups (Table 1 and 2), were the subjects of investigations. Microgels content (by SLS method, Table 3), crosslinking process observation (by DLS, Fig. 1), molecular weights and molecular weight distributions (by SLS and SEC, Table 4) as well as the changes of PSU chemical structure (by FT-IR) were examined in the solutions. Shapes and dimensions of the structures observed in PSU coatings were evaluated using SAXS method (Figs. 4 and 5) and optical or electron microscopy. It has been found that the surface layer is twice silicon enriched in comparison with the subsurface layer. On the basis of rheological and mechanical properties investigations (Figs. 2, 3 and 6) it was demonstrated that the coatings obtained from microgels containing PSU samples show higher loss modulus and storage modulus, in the whole range of vibration frequency, than made of microgels free samples. They also show stable damping, opposite to the last one. Stable damping cause better crack resistance of coatings exposed to deformations and vibrations.


Keywords: polysiloxaneurethane prepolymers, microgels, solutions properties, coatings properties

Z. Członkowska-Kohutnicka, M. Zielonka, D. Wilson-Polit, R. Kwiatkowski, J. Sobczak, I. Leszczyńska, J. Kozakiewicz, A. Winiarska (1.73 MB)
Properties of the solutions and coatings of microgels containing polysiloxaneurethane prepolymers (part I)
Z. Członkowska-Kohutnicka, M. Zielonka, D. Wilson-Polit, R. Kwiatkowski, J. Sobczak, I. Leszczyńska, J. Kozakiewicz, A. Winiarska (1.53 MB)
Properties of the solutions and coatings of microgels containing polysiloxaneurethane prepolymers (part II)