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After 180 min, the reaction mixture was immediately
filtered through Whatman filter paper no. 41. The residue
was dried in vacuum oven at 70¡æ. The dry residue was then
made free from homopolymer by exhaustive extraction with
hot N,N-dimethyl formamide for 20-24 h till the supernatant
layer showed no precipitation of poly(methacrylonitrile)
with water, a precipitant used in the present work.
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