脱脂紫茎泽兰细度对水凝胶溶胀动力学的影响  

Effect of the Different Finenesses of Dewaxed Eupatorium Adenophorum on Swelling Kinetics of Hydrogels

作　　者：刘其星[1] 高欣[1] 陈克利[1] 张恒[1] 

机构地区：[1]昆明理工大学制浆造纸工程研究中心,昆明650500

出　　处：《材料导报》2013年第18期84-88,共5页Materials Reports

基　　金：国家自然科学基金(21276119);云南省教育厅科学研究基金(2012Y537);昆明理工大学测试基金(20130490)

摘　　要：以不同细度粉末状脱脂紫茎泽兰(EA)为原料,研究在相同的接枝共聚条件下所得的水凝胶的溶胀行为。实验表明:在45～75μm范围内,随着原料颗粒细度的降低,所得相应凝胶的溶胀速率和溶胀度均增大,水分子在凝胶中的扩散行为可用non-Fickian扩散来描述;在30～45μm时所得凝胶的溶胀过程符合Fickian扩散规律。通过Beren-Hopfenberg微分方程,计算得到凝胶吸液值大于60%时的溶胀扩散常数。利用Arrhenius公式计算得到相应的活化能均在69.0～89.0kJ·mol-1范畴内,且随原料颗粒细度的减小,凝胶Ⅱ-1-Ⅱ-4的Ea值呈下降趋势;而Ⅱ-5的活化能略高于Ⅱ-4,但仍小于其他凝胶的Ea值。The different finenesses of the pulverized Eupatorium adenophorum （EA） after dewaxing process was evaluated as potential raw materials for hydrogels whose swelling behaviors were studied and compared at the same graft-copolymerization condition.The experimental results show that the swelling rates and swelling ratios of EA hydrogels enhanced with decreasing the granule size of pulverized EA and the swelling exponents have been found to indicate non-Fickian mechanism at the fineness range of 45-75μm,while the swelling mechanism belongs to Fickian transport for EA hydrogel at 30-45μm.Moreover,to obtain better model for above 60％ water uptake,the BerenHopfenberg differential model was applied for calculating the relaxation constants.Additionally,the range of activation energy （Ea） for the five samples was found to be 69.0-89.0 kJ · mol-1 as determined from the Arrhenius plot,and the Ea values of Ⅱ-1-Ⅱ-4 were declined with decreasing the EA granule size,while Ⅱ-5 activation energy was slightly higher than Ⅱ-4,but still lower than other hydrogels.

关 键 词：脱脂紫茎泽兰 颗粒细度 溶胀动力学 活化能 

分 类 号：TQ321[化学工程—合成树脂塑料工业]