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Semibatch Process
As an example, acrylamide (0.8 g, 11.26 mmol), 20wt % of the total 0.2 g of the polyDMAEMA-DMSmacromonomer (Table 1, entry 10;molecular weight after quaternization £½27,400; 0.040 g,0.00146 mmol of polyDMAEMA-DMS chains),and 30 wt % of the total 10 mg of AIBA (3 mg) in16.8 mL of deionized water (5 wt % of the totalsolution consisted of monomers) were initially charged to a reactor equipped with a magnetic
stirrer and were purged with high-purity nitrogen for 30 min. PolyDMAEMA-DMS macromonomer (160 mg) and 7 mg of AIBA in 3.2 mL of deionized water were fed into the reactor at a constant feeding rate controlled by a pump during a 2-h period. A sample (0.5 mL) was taken each time at preset time intervals with a degassed syringe and was precipitated in methanol. The conversion was calculated from the ratio of the weight of the dried
polymer collected over that of the total comonomers initially charged to the sample (5 wt % of the solution).

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[ Last edited by superli on 2007-7-5 at 12:43 ]
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