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首页> 外文期刊>Journal of Applied Polymer Science >Graft copolymerization of acrylamide-methylacrylate comonomers onto cellulose using ceric ammonium nitrate
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Graft copolymerization of acrylamide-methylacrylate comonomers onto cellulose using ceric ammonium nitrate

机译：用硝酸铈铵将丙烯酰胺-丙烯酸甲酯共​​聚单体接枝到纤维素上

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The graft copolymerization of acrylamide-methylacrylate comonomers was carried out using ceric ammonium nitrate as initiator in the presence of nitric acid at 25 +/- 1degreesC. The effects of feed molarity, feed composition, reaction time, and temperature on graft yield (%G) and other grafting parameters were investigated. The determination of rate of ceric (IV) ions disappearance as a function of feed molarity and reaction time was useful in the determination of the rate of ceric (IV) ions consumption during graft copolymerization. The graft yield (%G) in the presence of acrylamide increases because of the synergistic effect of acrylamide comonomer. The composition of the grafted chains (F-AAm) varies on varying the feed composition and reaction temperature but is almost constant during feed molarity variation. The Mayo and Lewis method was used to determine the reactivity ratios of acrylamide (r(1)) and methylacrylate (r(2)), which are 0.65 and 1.07, respectively. The product of reactivity ratio (r(1) r(2)) is less then unity; hence, an alternate arrangement of comonomer blocks in the grafted copolymer chain is proposed. The rate of graft copolymerization of comonomers onto cellulose is second power to the concentration of comonomers and square root to the concentration of ceric ammonium nitrate. Suitable reaction steps for graft copolymerization of comonomers onto cellulose are proposed. (C) 2002 Wiley Periodicals, Inc. [References: 24]
机译：丙烯酰胺-丙烯酸甲酯共​​聚单体的接枝共聚反应是在硝酸存在下，硝酸+/- 25℃，硝酸硝酸铵为引发剂的条件下进行的。研究了进料摩尔浓度，进料组成，反应时间和温度对接枝率（％G）和其他接枝参数的影响。取决于进料摩尔浓度和反应时间的铈（IV）离子消失速率的测定可用于测定接枝共聚过程中铈（IV）离子消耗速率。由于丙烯酰胺共聚单体的协同作用，在丙烯酰胺存在下的接枝产率（％G）增加。接枝链（F-AAm）的组成随进料组成和反应温度的变化而变化，但在进料摩尔浓度变化期间几乎恒定。使用Mayo和Lewis方法确定丙烯酰胺（r（1））和丙烯酸甲酯（r（2））的反应比，分别为0.65和1.07。反应率之积（r（1）r（2））小于1。因此，提出了在接枝共聚物链中共聚单体嵌段的另一种排列方式。共聚单体在纤维素上的接枝共聚速率是共聚单体浓度的第二幂，而平方根是硝酸铈铵的浓度。提出了将共聚单体接枝共聚合到纤维素上的合适反应步骤。 （C）2002 Wiley Periodicals，Inc. [参考：24]

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