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Swelling kinetics of modified poly(vinyl alcohol) hydrogels

机译:改性聚乙烯醇水凝胶的溶胀动力学

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Interpenetrating polymer network (IPN) hydrogels composed of poly(vinyl alcohol) (PVA) and monomer, N-isopropylacrylamide (NIPAAm), diallyldimethylammonium. chloride (DADMAC), or methacrylic acid (MAA) were prepared by using the sequential-IPN method. The equilibrium swelling ratios of PVA/NIPAAm (VANP), PVA/DADMAC (VADC), and PVA/MAA (VAMA) are 412, 370, and 297 at 25degreesC, respectively. VANP had the highest swelling ratio in time-dependent swelling behavior, whereas the swelling ratio of VAMA had the lowest. The n values of VANP, VADC, and VAMA are 0.72, 0.81, and 0.96, respectively. Transport of all IPN hydrogels is anomalous and their transport mechanisms are dominated by a combination of diffusion-controlled and relaxation-controlled systems. VAMA has the highest activation energy and VANP has the lowest activation energy. The values of all IPN hydrogels are from 4.66 to 16.49 kJ/mol, which proves that all IPN hydrogels are hydrophilic. (C) 2003 Wiley Periodicals, Inc. [References: 20]
机译:由聚乙烯醇(PVA)和单体,N-异丙基丙烯酰胺(NIPAAm),二烯丙基二甲基铵组成的互穿聚合物网络(IPN)水凝胶。通过使用顺序IPN方法制备氯化物(DADMAC)或甲基丙烯酸(MAA)。在25摄氏度时,PVA / NIPAAm(VANP),PVA / DADMAC(VADC)和PVA / MAA(VAMA)的平衡溶胀率分别为412、370和297。在随时间变化的溶胀行为中,VANP溶胀率最高,而VAMA的溶胀率最低。 VANP,VADC和VAMA的n值分别为0.72、0.81和0.96。所有IPN水凝胶的运输都是异常的,其运输机制受扩散控制系统和松弛控制系统的组合控制。 VAMA具有最高的活化能,而VANP具有最低的活化能。所有IPN水凝胶的值均在4.66至16.49 kJ / mol之间,这证明所有IPN水凝胶均具有亲水性。 (C)2003 Wiley Periodicals,Inc. [参考:20]

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