The Preparation And Functional Application Of Polyurethane

Polyurethane is a new kind of organic high-molecular material has attracted attentionabout a lot of entrepreneures and experts and can be applied in various areas of national life.We are going on prepolymerization reaction firstly with the solid state of pure4,4-two phenylmethane diisocyanate (MDI) and molecular weight of polyol2000as the main raw materialsand then synthesizing polyurethane (PU) with hydrophilic chain extender2,2-dimethylolpropionic acid (DMPA) and other raw materials to the prepolymer. We used variouscharacterization techniques to characterizer different molecular structure and properties ofsynthesized polyurethane. Next, we let chemical modification of multi-walled carbonnanotubes (MWNTs) participate in the reaction by in situ polymerization reacting withpolyurethane to get the composite functional MWNTs/PU elastomer material. At last, we alsoprepared polyurethane film and got another composite functional PPY/PU elastomer materialvia in-situ polymerization on polyurethane film. The dispersion state of MWNTs inMWNTs/PU materials was characterized by transmission electron microscopy. We conducteda thermo-gravimetric analysis (TGA) test to study the thermal properties of MWNTs on thecomposite and its final MWNTs content. At the same time, we test the electrical conductivityof the materials of MWNTs/PU and PPY/PU at room temperature. The results showedmodified materials possessed higher electrical conductivity than without polyurethanemodification. These elastic conductive materials not only had good elasticity, but also hadexcellent electrical conductivity. Therefore, we can use the elastic conductive materialsapplied to health care, biological sensors, power generation materials, as well as some specificmaterials in the universe.