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Effect of Fe2O3 on the swelling, mechanical and thermal behaviour of NIPAM-based terpolymer
Polymer Bulletin ( IF 3.2 ) Pub Date : 2020-09-03 , DOI: 10.1007/s00289-020-03336-8
Suman Shekhar , M. Mukherjee , Akhil Kumar Sen

The present work involves fabrication of PNIPAM-based terpolymeric hydrogel magnetite (Fe2O3) composite, i.e. ferrogels by coprecipitation method. The effects of Fe2O3 particles on the properties of resulting hydrogels were examined in terms of swelling studies at different temperatures, deswelling kinetics, mechanical and separation behaviour. The ferrogels were found to have higher equilibrium swelling percentage than conventional hydrogels. This shows that the thermoresponsive behaviour of the FeNTA233, FeNTH233 and FeNTM233 remains unchanged and having a range of phase transition temperature. It was observed that the ferrogels exhibited higher rate of swelling than the conventional hydrogels. FeNTA233, FeNTH233 and FeNTM233 showed non-Fickian type of diffusion. Deswelling study showed that ferrogels exhibited the faster shrinking rate and lost water dramatically. Thermogravimetric studies of ferrogels in air atmosphere were carried out to reveal the kinetics and mechanism of the thermal decomposition reaction through Coats–Redfern calculation and deconvolution procedures. The values of the apparent activation energy E and pre-exponential factor A in Arrhenius equation were calculated. Also, incorporation of magnetite particle increased the storage moduli and compression moduli of ferrogels by reinforcement of network structure. But, it was found that the separation efficiency of ferrogels reduced from the conventional hydrogels.

中文翻译:

Fe2O3 对 NIPAM 基三元共聚物的溶胀、机械和热行为的影响

目前的工作涉及制造基于 PNIPAM 的三元聚合物水凝胶磁铁矿 (Fe2O3) 复合材料,即通过共沉淀法制备的铁凝胶。在不同温度下的溶胀研究、消溶胀动力学、机械和分离行为方面,研究了 Fe2O3 颗粒对所得水凝胶性能的影响。发现铁凝胶比传统水凝胶具有更高的平衡溶胀百分比。这表明 FeNTA233、FeNTH233 和 FeNTM233 的热响应行为保持不变并具有一定的相变温度范围。据观察,ferrogels 表现出比传统水凝胶更高的溶胀率。FeNTA233、FeNTH233 和 FeNTM233 显示出非 Fickian 类型的扩散。消胀研究表明,ferrogels 表现出更快的收缩率和显着失水。通过 Coats-Redfern 计算和解卷积程序,对空气中的铁凝胶进行了热重研究,以揭示热分解反应的动力学和机制。计算了Arrhenius方程中表观活化能E和指前因子A的值。此外,磁铁矿颗粒的掺入通过增强网络结构增加了铁凝胶的储存模量和压缩模量。但是,发现铁凝胶的分离效率低于传统水凝胶。通过 Coats-Redfern 计算和解卷积程序,对空气中的铁凝胶进行了热重研究,以揭示热分解反应的动力学和机制。计算了Arrhenius方程中表观活化能E和指前因子A的值。此外,磁铁矿颗粒的掺入通过增强网络结构增加了铁凝胶的储存模量和压缩模量。但是,发现铁凝胶的分离效率低于传统水凝胶。通过 Coats-Redfern 计算和解卷积程序,对空气中的铁凝胶进行了热重研究,以揭示热分解反应的动力学和机制。计算了Arrhenius方程中表观活化能E和指前因子A的值。此外,磁铁矿颗粒的掺入通过增强网络结构增加了铁凝胶的储存模量和压缩模量。但是,发现铁凝胶的分离效率与传统水凝胶相比有所降低。磁铁矿颗粒的掺入通过增强网络结构增加了铁凝胶的储存模量和压缩模量。但是,发现铁凝胶的分离效率低于传统水凝胶。磁铁矿颗粒的掺入通过增强网络结构增加了铁凝胶的储存模量和压缩模量。但是,发现铁凝胶的分离效率低于传统水凝胶。
更新日期:2020-09-03
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