丝胶-丙烯酸-丙烯酰胺高吸水性树脂的制备

实验以过硫酸钾-亚硫酸钠氧化还原体系为引发剂、N,N′-亚甲基双丙烯酰胺为交联剂,制备丝胶-丙烯酸-丙烯酰胺接枝共聚型吸水树脂。产物经红外光谱表征。研究了不同反应条件下得到的聚合物吸蒸馏水和生理盐水的能力,探讨了影响产品吸水性能的因素。结果表明:当引发剂用量与单体总质量比为1.25%,交联剂用量与单体总质量比为0.01%,中和度为75%,丙烯酰胺与丙烯酸质量比为0.7:1,聚合温度55℃,聚合时间6 h时,所得产物吸液能力较佳,随丝胶用量的增加,产物吸液能力缓慢上升。当丝胶用量为4%时,产物吸蒸馏水能力为1 847倍,吸盐水能力为112倍。

PREPARATION AND PROPERTIES OF SILK SERICIN-ACRYLIC ACID-ACRYLAMIDE COPOLYMER

The silk sericin-acrylic acid-acrylamide copolymers were synthesized by aqueous solution polymerization with potassium peroxodisulfate-sodium sulfite as redox initiation system and N,N'-methylenebisacrylamide as crosslinker.The products were characterized by infrared absorption spectroscopy. The synthesis conditions that affect the product water absorption quantity were studied. The optimal reaction conditions were:initiator 1.25%,crosslinker 0.01%,neutralization degree 75%,mass ratio of acrylamide to acrylic acid of 0.7,reaction temperature 55℃and reaction time 6 h.With the amount of silk sericin in polymerization increasing,the product's water absorbency slowly increased.When the mass ratio of silk sericin to monomers was 4%,the product could absorb 1 847 times of distilled water and absorb 112 times of 0.9%NaCl aqueous solution.But the product's water absorbency gradually decreased when the amount of silk sericin to monomers further increased.