synthesis and characterization of new nanocomposites based on poly(urethane-imide)s reinforced functionalized carbone nanotubes containing n-trimellitimido-l-valine as rigid segments

New poly(urethane-imide)s (puims/mwcnt) nanocomposites (8a 8b) containing two different amounts of mwcnts were prepared by in situ polymerization technique. transmission electron microscopy (tem) showed that mwcnts were exfoliated in the polymer matrix, resulting in well-dispersed morphologies at 1.5 and 2.5 mass% mwcnt contents. the effects of multiwall carbon nanotubes (mwcnt) on the thermal property of new puims/mwcnt derived from n-trimellitimido-l-valine were investigated by thermogravimetric analysis (tga) in nitrogen atmosphere. tga results showed that the addition of mwcnt resulted a substantial increase of the thermal stability and char yields of the nanocomposites compared to the neat puims. tem experiments show morphology and good dispersion of nanotubes in polymeric matrix. the x-ray pattern of the puims/mwcnt nanocomposites (8a) showed the combined peaks appearing in the mwcnt and pure puims (7).