羧甲基纤维素/聚乙二醇/丙烯酸高吸水性复合材料的性能测试

Property Testing of Carboxymethyl Cellulose/Poly(ethylene glycol)/Acrylic Acid Superabsorbent Composite

摘要:

在水溶液中，以丙烯酸(AA)、羧甲基纤维素(CMC)和聚乙二醇(PEG)为原料，N,N'-亚甲基双丙烯酰胺(MBA)为交联剂，用辉光放电电解等离子体(GDEP)技术引发制备羧甲基纤维素/聚乙二醇/丙烯酸(CMC/PEG/AA)高吸水性复合材料。考察了温度、pH、盐浓度对复合材料平衡溶胀率的影响，初步研究了复合材料对染料亚甲基蓝的吸附行为。结果表明，CMC/PEG/AA高吸水性复合材料在30 ℃蒸馏水中最大溶胀率达到1115 g/g；该复合材料具有pH敏感性、盐敏感性和可逆溶胀-消溶胀开关行为；其对亚甲基蓝的吸附量可达1878.8 mg/g，吸附行为遵循动力学拟二级模型。

Abstract:

A carboxymethyl cellulose/poly(ethylene glycol)/acrylic acid (CMC/PEG/AA) superabsorbent composite was prepared in aqueous solution using glow-discharge electrolysis plasma (GDEP) induced graft copolymerization of carboxymethyl cellulose (CMC), poly(ethylene glycol) (PEG) and acrylic acid (AA), in which N,N'-methylenebisacrylamide (MBA) was used as a crosslinker. The influences of temperature, various pH values and salts solutions on the equilibrium swelling ratio were studied in detail. The adsorption of methylene blue (MB) on the CMC/PEG/AA was preliminarily investigated. The results showed that the maximum equilibrium swelling ratio of CMC/PEG/AA in distilled water was 1115 g/g at 30 ℃. The CMC/PEG/AA superabsorbent composite was responsive to pH and salts, and it had excellent on-off switching behavior as reversible swelling and deswelling. In addition, the maximum adsorption capacity of CMC/PEG/AA for MB was 1878.8 mg/g. The adsorption kinetics fitted the pseudo-second-order model.