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从甲壳素出发,先制备了3种不同脱乙酰度的壳聚糖,选择过硫酸铵_亚硫酸氢钠为氧化还原体系引发剂,合成了壳聚糖接枝丙烯酰胺聚合物;通过红外光谱,电镜扫描对聚合物进行结构表征,结果表明壳聚糖结构发生了变化,通过在相同条件下比较壳聚糖不同脱乙酰度对接枝率的影响,得出了在脱乙酰度为68.5%时聚合物的接枝率最大为250%,其最佳合成工艺为∶m(壳聚糖)∶m(丙烯酰胺)=1∶5,引发剂用量为体系质量分数的0.3%~0.4%,温度55~60℃,反应时间为2.5~3.0 h。
Starting from chitin, three kinds of chitosan with different degree of deacetylation were prepared, ammonium persulfate and sodium bisulfite were selected as redox initiator, and chitosan grafted acrylamide polymer was synthesized. The results showed that the structure of chitosan changed. By comparing the effect of different degree of deacetylation of chitosan on the grafting degree under the same conditions, the results showed that when the degree of deacetylation was 68.5% When the graft ratio of polymer is up to 250%, the best synthesis process is as follows: m (acrylamide) = 1: 5, the amount of initiator is 0.3% ~ 0.4% of the system mass fraction, Temperature 55 ~ 60 ℃, the reaction time is 2.5 ~ 3.0 h.