Study of structure property relationships in segmented polyurethanes (PUR) and its composites has acquired importance due to the broad range of PUR applications. This paper presents the application of quantitative image analysis to the description of morphological properties of modified boehmite and hybrid polyurethane. This analysis was used inter alia in the description of internal structure images and surface layer of materials as well as in description of their fractures. Fracture images of boemithe, and cut surface of polyurethane were obtained using high-resolution electron microscopy technique and atomic force microscopy. Quantitative analysis of the mechanical change images of fracture structure obtained with that technique allowed us to explain the mechanism of the changes and the thermal properties of polyurethane composites, as well as allowed us to determine relationships between structure characteristics and properties of examined materials.

Stereology methods were also found to be useful in comparative analysis of polyurethane composites structure and structure of boehmite and products of its modification. Ingredients used for PUR synthesis were: poly(ethylene adipate) (PEA) mol.wt 2000, 4,4’diphenylmethane diisocyanate (MDI), glycol (G1), glycerine (G2). The filler was added to PUR matrix in 3,5% wt. Synthesis was performed in one-shot process. Polyurethanes with PEA:MDI:G1:G2 molar ratio 6:9:2:1 were synthesized. The curing reaction was performed in the temperature of 120ºC for 16 hours.

The mechanical and thermal properties of polyurethane boehmite composites were investigated.

The author thank the Prof Z.Florjańczyk and Mrs A. Wolak for supplying us modified boemite.

This research was financed by Polish State Committee for Scientific Research (as research projects PBZ-KBN-095/T08/2003 and 3T08A07428).

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