Urea-urethane nanocomposites obtained from modified methylalumoxane oligomers

• Autorzy: Boczkowska A. , Marczewski M. , Ciecierska E. , Sienkiewicz B. , Pietrzykowski A.
• Języki publikacji: EN

Abstrakty

EN

Urea-urethane elastomers were synthesized in a polyaddition reaction of ethylene oligoadipate (OAE) of an average molecular weight 2000 u with bis(4-isocyanatephenyl)methane (MDI). Dicyandiamide was used as a chain extender. In order to obtain hybrid nanocomposites, OAE was modified by the reaction with methylalumoxanes (MAO) prior to use. The excess of active methyl groups of MAO was deactivated by reactions with alcohols or alkylphosphates. This method allowed one to introduce nanosized aluminum-oxide based moieties into the polyurethane. The amount of nanoparticles was equal to 3 wt. %. The aim of the study was a homogeneous molecular dispersion of aluminum-oxide units in order to obtain urea-urethane nanocomposites with a higher fire resistance and improved mechanical properties. Microstructure of the nanocomposites was studied with the high resolution scanning electron microscopy (HRSEM). Mechanical properties were examined by standard testing procedures. Flammability tests were also performed using a cone calorimeter under heat flux equal to 50 kW/m2. The results of the microstructure studies show even distribution of the nano-sized aluminum-oxide units in the polyurethane bulk. We observed an increase of such properties as Young's modulus and hardness, accompanied by a significant decrease in the heat release rate.

Słowa kluczowe

EN

urea-urethane elastomer; nanocomposite; methylalumoxanes

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2008
• Tom: Vol. 26, No. 2
• Strony: 301--308
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Boczkowska A.

autor

Marczewski M.

autor

Ciecierska E.

autor

Sienkiewicz B.

autor

Pietrzykowski A.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, ul. Wołoska 141, 02-507 Warsaw, Poland

Bibliografia

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