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   synthesis, characterization and comparative study of aromatic polyureas based on 2, 3-dihydro-1, 4-phthalazinedione with various aromatic and aliphatic diisocyanates  
   
نویسنده mohammadzadeh koumleh sanaz ,rahmani shahrzad ,nasr-isfahani hosein
منبع asian journal of green chemistry - 2022 - دوره : 6 - شماره : 2 - صفحه:145 -154
چکیده    Rigid aromatic backbone in high-performance polymers such as kevlar has been known to be effective in their remarkable properties. four new polyureas were synthesized based on the 2, 3-dihydro-1, 4-phthalazinedione with various aromatic and aliphatic diisocyanates to mimic the properties of high-performance polymers with accessible monomers, facile synthesis procedures, and more economic. the chemical structure of polyureas was validated using infrared spectroscopy (ir) and elemental analysis. molecular weight was determined using the mark-houwink equation. weight losses of these polyureas with temperature were determined by thermal gravimetric analysis (tga). depending on the structure of polyureas, that had an average melting temperature of 153-290 °c, solubility parameters were calculated using the group molar attraction constants of hoy. polymers were almost insoluble in different solvents, as demonstrated by attempts to solubilize in several solvents at 40 °c.
کلیدواژه polyurea ,phthalazinedione ,aromatic backbone ,mark- houwink equation ,group molar attraction constants
آدرس shahrood university of technology, department of chemistry, iran, babol noshirvani university of technology, department of chemical engineering, iran, shahrood university of technology, department of chemistry, iran
پست الکترونیکی rahmani.shahrzad.2011@gmail.com
 
     
   
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