Aziz Ahmadi-khaneghah - School of Chemistry, Damghan University, Damghan, Iran
Elham Naeemikhah, - School of Chemistry, Damghan University, Damghan, Iran
Mehrdad Omidi-Ghallemohamadi, - School of Chemistry, Damghan University, Damghan, Iran
Hossein Behniafar - School of Chemistry, Damghan University, Damghan, Iran

Polyurethane (PU) is used for a variety of applications, from foams to elastomers and films, whose properties depend on the type and functionality of the polyols and isocyanates 1. Polyurethanes have desirable properties such as high abrasion resistance, tear strength, shock absorption, flexibility and elasticity. Although they have relatively poor thermal stability, this can be improved by using treated clay 2. Clays have also been used to improve properties of elastomeric and rigid PUs. polymer/clay nanocomposites have drawn considerable interest because of their enhanced properties, including flame resistance, mechanical properties, gas barrier properties, thermal stability and biodegradability, when compared to pristine polymers 3. In this study, the synthesis and characterization of poly(tetramethylene oxide) (PTMO)-based segmented polyurethane using 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-buthylene glycol (1,4-BG) chain extender (Figure 1). Then the organically modified montmorillonite by the tetradecyltrimethylammonium bromide (TTAB-MMT) with the amount of 2.5 and 5 w% into the polyurethane matrix was dispersed in polymeric. the resulting nanocomposites are also investigated by TG/DTG and XRD measurements.

polymer-clay nanocomposite, Montmorillonite, polyurethane, Organoclay