Mallakpour Shadpour, Khadem Elham
Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran; Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Ultrason Sonochem. 2017 Nov;39:430-438. doi: 10.1016/j.ultsonch.2017.05.008. Epub 2017 May 6.
This work is focused on the fabrication and determination of physicochemical behaviors of new poly(vinyl alcohol) (PVA) nanocomposites (NCs) containing various contents of calcium carbonate (CC) nanoparticles modified with γ-aminopropyl triethoxy silane (ATS) (henceforth designated as CC-ATS) which could be a crucial treatment for their application as gas barrier to O gas and uptake of metal ions in waste waters. Samples were produced through the solution casting method under ultrasound irradiation. Thermal and mechanical performances were also evaluated for all ultrasonically synthesized nanocomposites and the results indicated that thermal and mechanical stability are dramatically enhanced by addition of a small amount of modified CC-ATS within PVA up to 5wt% and higher amounts has low effect on the composite properties. The result of oxygen gas permeability of PVA showed a 25.44% reduction by adding of 5wt% of CC-ATS into polymer matrix. Experimental adsorption isotherm data indicated that PVA NC has more efficiency for Cu(II) adsorption relative to pure PVA and well simulated by Langmuir model with maximum adsorption capacity of 45.45mgg. Moreover, study of sorption kinetic indicated that the solute adsorption on PVA/CC-ATS NC 5wt% was well modeled using the pseudo-second-order.
本工作聚焦于新型聚（乙烯醇）（PVA）纳米复合材料（NCs）的制备及其物理化学行为的测定，该复合材料包含不同含量的经γ-氨丙基三乙氧基硅烷（ATS）改性的碳酸钙（CC）纳米颗粒（以下简称CC-ATS），这对于其作为氧气气体阻隔材料以及废水中金属离子吸收的应用而言可能是一种关键处理方法。样品通过超声辐照下的溶液浇铸法制备。还对所有超声合成的纳米复合材料进行了热性能和力学性能评估，结果表明，在PVA中添加少量改性CC-ATS（最高5wt%）可显著提高热稳定性和力学稳定性，而更高含量对复合材料性能的影响较小。PVA的氧气透过率结果显示，向聚合物基体中添加5wt%的CC-ATS可使其降低25.44%。实验吸附等温线数据表明，相对于纯PVA，PVA NC对Cu(II)的吸附效率更高，并且用Langmuir模型能很好地模拟，最大吸附容量为45.45mgg。此外，吸附动力学研究表明，使用准二级模型能很好地模拟溶质在5wt%的PVA/CC-ATS NC上的吸附。
