Applications of quantitative image analysis to the description of the morphology of hybrid polyurea-nitryle-urethanes

Joanna Ryszkowska ,  Ewelina A. Zawadzak ,  Ida Dulińska ,  Krzysztof J. Kurzydlowski 

Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

This paper presents the application of quantitative image analysis to the description of morphological properties hybrid polyurea-nitryle-urethanes (PUNU). Properties of polyurethanes are determined by type of polyols, isocyanates and chain extending agents. The type of used components; their molar ratio and synthesis condition affect the length of macromolecules and degree of cross-linking. These features determine properties such as: tensile strength, chemical and thermal resistance.
Cast segmented polyurea-nitryle-urethanes were obtained from: poly(ethylene adipate) (PEA) mol.wt 2000, 4,4’diphenylmethane diisocyanate (MDI) and dicyandiamide(DCDA). DCDA is crystalline powders with diameter of particles higher than 0,05um. Polyurethanes with PEA:MDI:DCDA molar ratio 3:4:1 were synthesized. The mixtures of PEA and DCDA were dehydrated for 2h at temperatures from 140 to 170±5C under vigorous stirring. Synthesis was performed in one-shot process. The polymers were cured for 16h at temperature from 110 to 190±5C. The samples were conditioned for two weeks at room temperature.
This paper also describes application of quantitative image analysis to the description of particles diameter and domain structure of hybrid polyurea-nitryle-urethane.
Cut surface of polyurethane was obtained using high resolution electron microscopy technique and atomic force microscopy. The mechanical and thermal properties of polyurea-nitryle-urethane were investigated.
Quantitative analysis of the images of fracture structure allowed us to explain the changes of mechanical and thermal properties of examined materials.

This research was financed by Polish State Committee for Scientific Research as research projects 3T08A07428

 

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium E, by Ida Dulińska
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-06-09 08:37
Revised:   2009-06-07 00:44