The graft copolymerization of acrylamide （ AM ） / acrylic acid （ AA ） onto starch （ St- g-pAA and St-g-p（AA-co-AM） ） was carried out using an orthngonal test method. The combined effects of different reaction...The graft copolymerization of acrylamide （ AM ） / acrylic acid （ AA ） onto starch （ St- g-pAA and St-g-p（AA-co-AM） ） was carried out using an orthngonal test method. The combined effects of different reaction conditions on the water absorbency of the graft copolymers were optimized through mathematical statistical methods of range and square variance analysis. The maximum water absorbency was obtained when the ratio of dried starch to distilled water was 1 ： 8 （ w/w ）, the ratio of starch to monomer 1 ： 6 （ w/w ）, the initiator concentration 4.40 × 10^-3 mol/L, the crosslinker concentration 10.86 × 10^-2 mol/L, and the basicity to AA 0. 70（ mol/mol ）. Both the graft copolymers have an excellent water absorption capacity in distilled water aact in 0. 9wt% NaCl solution. It was also found that in distilled water the water absorbency of St-g-pAA was higher than that of St-g-p（ AA-co-AM） , while in 0.9wt% NaCl solution, the situation was just the reverse. The correlation between the water absorbeacy anct the nature of the solution anct the properties of the copolymers, which is related to the properties of the monomers, was discussed. The grafting of AA ancl AM onto starch was confirmed by the IR spectra of St-g-pAA and St-g-p（ AA-co-AM）.展开更多
以淀粉、丙烯酰胺、丙烯酸为共聚单体,硝酸铝为交联剂,过硫酸钾为引发剂,Span-60/Tween-60为复合乳化剂,采用反相悬浮聚合法合成了一种新型暂堵剂淀粉-丙烯酰胺-丙烯酸共聚物,并采用SEM和FTIR技术对共聚物进行了表面形貌分析和结构表征...以淀粉、丙烯酰胺、丙烯酸为共聚单体,硝酸铝为交联剂,过硫酸钾为引发剂,Span-60/Tween-60为复合乳化剂,采用反相悬浮聚合法合成了一种新型暂堵剂淀粉-丙烯酰胺-丙烯酸共聚物,并采用SEM和FTIR技术对共聚物进行了表面形貌分析和结构表征;考察了硝酸铝用量、丙烯酸中和度和淀粉用量对暂堵剂吸水性能的影响。实验结果表明,暂堵剂的最佳合成条件:丙烯酰胺5.00 g、环己烷60 mL、0.80 g Span-60、0.40 g Tween-60、丙烯酸中和度80%、淀粉1.50 g、硝酸铝0.02 g、70℃、3 h;在该条件下合成的暂堵剂的吸水倍率最大,且具有适中的强度。展开更多
文摘The graft copolymerization of acrylamide （ AM ） / acrylic acid （ AA ） onto starch （ St- g-pAA and St-g-p（AA-co-AM） ） was carried out using an orthngonal test method. The combined effects of different reaction conditions on the water absorbency of the graft copolymers were optimized through mathematical statistical methods of range and square variance analysis. The maximum water absorbency was obtained when the ratio of dried starch to distilled water was 1 ： 8 （ w/w ）, the ratio of starch to monomer 1 ： 6 （ w/w ）, the initiator concentration 4.40 × 10^-3 mol/L, the crosslinker concentration 10.86 × 10^-2 mol/L, and the basicity to AA 0. 70（ mol/mol ）. Both the graft copolymers have an excellent water absorption capacity in distilled water aact in 0. 9wt% NaCl solution. It was also found that in distilled water the water absorbency of St-g-pAA was higher than that of St-g-p（ AA-co-AM） , while in 0.9wt% NaCl solution, the situation was just the reverse. The correlation between the water absorbeacy anct the nature of the solution anct the properties of the copolymers, which is related to the properties of the monomers, was discussed. The grafting of AA ancl AM onto starch was confirmed by the IR spectra of St-g-pAA and St-g-p（ AA-co-AM）.
文摘以淀粉、丙烯酰胺、丙烯酸为共聚单体,硝酸铝为交联剂,过硫酸钾为引发剂,Span-60/Tween-60为复合乳化剂,采用反相悬浮聚合法合成了一种新型暂堵剂淀粉-丙烯酰胺-丙烯酸共聚物,并采用SEM和FTIR技术对共聚物进行了表面形貌分析和结构表征;考察了硝酸铝用量、丙烯酸中和度和淀粉用量对暂堵剂吸水性能的影响。实验结果表明,暂堵剂的最佳合成条件:丙烯酰胺5.00 g、环己烷60 mL、0.80 g Span-60、0.40 g Tween-60、丙烯酸中和度80%、淀粉1.50 g、硝酸铝0.02 g、70℃、3 h;在该条件下合成的暂堵剂的吸水倍率最大,且具有适中的强度。
