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的制备和性能研究

Synthesis and Properties of Modified Poly(Aspartic acid )/ Poly(Acrylic acid) /Carboxymethyl Cellulose Composite Superabsorbent Resin

摘要:

以改性聚天冬氨酸（KPAsp）、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(KPAsp/PAA/CMC)复合高吸水性树脂。通过红外光谱（FTIR）、热重分析(TGA)和扫描电镜（SEM）对产物组成结构、热稳定性和表面形态进行表征。探讨了CMC和AA用量对复合高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0.9% NaCl溶液中的吸水倍率分别达到830 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、人工尿和不同浓度乙醇水溶液的吸液性能，结果表明复合树脂盐敏感性提高，在盐溶液中的吸液倍率为NaCl>FeCl3>CaCl2；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吸液倍率最大为211 g/g和142 g/g，在50%的乙醇水溶液中吸液倍率最大为295 g/g。

Abstract:

Modified poly(aspartic acid )/poly(acrylic acid) /carboxymethyl cellulose composite superabsorbent resin was prepared using modified poly (aspartic acid)(KPAsp),acrylic acid (AA) and carboxymethyl cellulose (CMC) as raw materials in an aqueous system. The composition structure, thermal stability and surface morphology of the products were characterized by Fourier-transform infrared spectroscopy(FTIR), thermal gravimetric analysis(TGA) and scanning electron microscopy(SEM).The effects of the amount of CMC and AA on swelling ratio of composite superabsorbent resin were investigated,the results showed that the optimal mass ratio of AA to CMC to modified polysuccinimide (KPSI) was 0.15:3:1,the swelling ratios of prepared composite resin were 830 g/g in distilled water and 130g/g in physiological saline respectively.The salt sensitivity, temperature sensitivity and pH sensitivity of KPAsp / PAA / CMC composite resin with different composition were studied, and swelling properties of resin in artificial blood, artificial urine and different concentrations of ethanol aqueous solution was also studied. The results showed that the salt sensitivity of the composite resin was increased, swelling ratios of resin in different salt solutions were NaCl> FeCl3> CaCl2;The lower critical solution temperature (LCST) of KPAsp/PAA/CMC was 15 ℃ higher than that of KPAsp,the composite resin had the best swelling ratios at pH=5 and pH=9; The maximum swelling ratios of the composite resin were 211 g/g in artificial blood and 142 g/g artificial urine, respectively. The maximum swelling ratios of the composite resin was 295 g / g in the 50% ethanol aqueous solution.