Descriptors :
Radical polymerization,Triazolinedione,Electrophilic aromatic substitution,Modification of polymer
Abstract :
Three vinyl monomers, 2,4,6-trimethoxystyrene, 4-(N,N-dimethylamino)styrene, and N-methyl-2-vinylpyrrole,were synthesized via the Witting reaction from the corresponding aldehyes.These monomers were homopolymerized by radical polymerization using a,aʹ-azoisobutyronitrile (AIBN) as initator at 60 C. The reaction of these polymers with 4-phenyl-1,2,4-triazoline-3,5-dione (PhTD) and 4-methyl -1,2,4-triazoline-3,5-dione(MeTD) was investigated.Although polytrimethoxystyrene reacts slowly with PhTd at room temperature, the other two polymers react fast and lead to the incorporation of the triazolinedione unit into the side chain of the polymer via electrophilic aromatic substitution. The reaction of bistriazolinediones (BTD) with these polymers was performed in dimethylformamide using 10-20,molar concentration of the BTD. The resulting crosslinked polymers are insoluble in polar as well as nonpolar solvents. Some physical properties of the unmodified polymers were studied.
