以N,N-亚甲基双丙烯酰胺(MBA)为交联剂,玉米淀粉和云母粉为复配基体,丙烯酸(AA)和丙烯酰胺(AM)为单体,通过超声波辅助合成了交联型淀粉/云母基高吸水性聚合物。采用傅里叶变换红外光谱仪和扫描电子显微镜对聚合物进行表征,考察了交联改性对聚合物吸液性能的影响,采用准一级动力学模型、准二级动力学模型和颗粒内扩散模型研究了聚合物对生理盐水、模拟尿液及模拟经血液的吸附行为。结果表明:当交联剂用量为淀粉/云母和单体总质量的0.25%时,聚合物对生理盐水、模拟尿液及模拟经血液的平衡吸附量分别为44.5g/g、36.6g/g和30.2g/g,对模拟经血液的吸收速度为49s,吸经血液凝胶保水率为90.2%;准二级动力学模型能更好地描述聚合物对生理盐水、模拟尿液及模拟经血液的吸附行为,吸附速率常数大小依次为生理盐水>模拟尿液>模拟经血液。
N,N-methylene bisacrylamide (MBA) was used as crosslinking agent,corn starch and mica powder were used as complex matrix,acrylic acid (AA) and acrylamide (AM) were used as monomers,and the crosslinked starch/mica superabsorbent polymer was synthesized by ultrasonic assisted.The polymer was characterized by fourier transform infrared spectrometer(FT-IR) and scanning electron microscope(SEM).The effect of crosslinking modification on the absorbent properties of the polymer was investigated.The adsorption behaviors of the polymer on normal saline,simulated urine and simulated blood were studied by using the quasi-first-order kinetic model,quasi-second-order kinetic model and the intra-particle diffusion model.The results showed that when the amount of crosslinking agent was 0.25% of the total mass of starch/mica and monomer,the equilibrium adsorption capacity of the polymer in normal saline,simulated urine and simulated blood were 44.5g/g,36.6g/g and 30.2g/g,respectively.The absorption rate of the simulated blood was 49s,and the water retention rate of the absorbent blood gel was 90.2%.The quasi-second-order kinetic model can better describe the adsorption behavior of the polymer to normal saline,simulated urine and simulated blood,and the adsorption rate constants of normal saline were larger than that of simulated urine and larger than that of simulated blood.
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