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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. ×ÖÃæÒâ˼¶¼¶®£¬Ï£ÍûÓнøÒ»²½µÄÏêϸ˵Ã÷£¡ |
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