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以聚琥珀酰亚胺(KPSI)、丙烯酸(AA)和羧甲基纤维素(CMC)为原料,采用水溶液聚合法合成改性聚天冬氨酸/聚丙烯酸/羧甲基纤维素复合高吸水性树脂(KPAsp/PAA/CMC)。通过红外光谱(FTIR)、热重分析(TGA)和扫描电镜(SEM)对产物的结构、热稳定性和表面形态进行表征。探讨了CMC和AA用量对复合吸水性树脂吸液性能的影响,结果表明,当m(CMC)∶m(AA)∶m(KPSI)=0.15∶3∶1时,树脂的吸液性能最佳,在去离子水和质量分数0.9%的NaCl水溶液(生理盐水)中的吸液倍率分别达到843 g/g和130 g/g。研究了不同组成KPAsp/PAA/CMC吸水性树脂的盐敏感性、温度敏感性和pH敏感性,以及树脂在人工血、人工尿和不同体积分数乙醇水溶液的吸液性能,结果表明,复合树脂盐敏感性提高,在盐溶液中的吸液大小顺序为NaCl>FeCl_3>CaCl_2;低临界溶解温度(LCST)比KPAsp提高了15℃;在溶液pH=5和pH=9出现了两吸液高峰;在人工血和人工尿中的最大吸液倍率为211 g/g和142 g/g,在体积分数为50%的乙醇水溶液中的最大吸液倍率为295 g/g。
The polyaspartic acid / polyacrylic acid / carboxymethyl cellulose composite superabsorbent was synthesized by aqueous solution polymerization using polysuccinimide (KPSI), acrylic acid (AA) and carboxymethylcellulose (CMC) as raw materials Resin (KPAsp / PAA / CMC). The structure, thermal stability and surface morphology of the product were characterized by FTIR, TGA and SEM. The effect of CMC and AA dosage on the liquid-absorbent property of the composite absorbent resin was investigated. The results showed that the best liquid-absorbent property was obtained when m (CMC): m (AA): m (KPSI) = 0.15: , The deionized water absorption rate of 843 g / g and 130 g / g respectively in deionized water and 0.9% NaCl aqueous solution (normal saline). The salt sensitivity, temperature sensitivity and pH sensitivity of KPAsp / PAA / CMC water-absorbing resins with different compositions were studied. The resin absorption properties of artificial blood, artificial urine and ethanol solution with different volume fractions were studied. The results showed that the composite resin salt The results showed that the order of absorbing liquid in salt solution was NaCl> FeCl 3> CaCl 2; the lower critical solution temperature (LCST) was increased by 15 ℃ than KPAsp; two absorption peaks appeared at pH = 5 and pH = 9; The maximum liquid uptake rates in artificial blood and artificial urine were 211 g / g and 142 g / g, and the maximum liquid uptake rate in a 50% volume aqueous ethanol solution was 295 g / g.