Tüfekci Mertol, Durak Sevgi Güneş, Pir İnci, Acar Türkan Ormancı, Demirkol Güler Türkoğlu, Tüfekci Neşe
Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
Department of Environmental Engineering, Faculty of Engineering-Architecture, Nevsehir Haci Bektas Veli University, Nevsehir 50300, Turkey.
Polymers (Basel). 2020 Oct 16;12(10):2378. doi: 10.3390/polym12102378.
To investigate the effect of polyvinylpyrrolidone (PVP) addition and consequently porosity, two different sets of membranes are manufactured, since PVP is a widely used poring agent which has an impact on the mechanical properties of the membrane material. The first set (PAN 1) includes polyacrylonitrile (PAN) and the necessary solvent while the second set (PAN 2) is made of PAN and PVP. These membranes are put through several characterisation processes including tensile testing. The obtained data are used to model the static behaviour of the membranes with different geometries but similar loading and boundary conditions that represent their operating conditions. This modelling process is undertaken by using the finite element method. The main idea is to investigate how geometry affects the load-carrying capacity of the membranes. Alongside membrane modelling, their materials are modelled with representative elements with hexagonal and rectangular pore arrays (RE) to understand the impact of porosity on the mechanical properties. Exploring the results, the best geometry is found as the elliptic membrane with the aspect ratio 4 and the better RE as the hexagonal array which can predict the elastic properties with an approximate error of 12%.
为了研究添加聚乙烯吡咯烷酮（PVP）以及由此产生的孔隙率的影响，制备了两组不同的膜，因为PVP是一种广泛使用的致孔剂，会对膜材料的机械性能产生影响。第一组（PAN 1）包括聚丙烯腈（PAN）和必要的溶剂，而第二组（PAN 2）由PAN和PVP制成。这些膜经过了包括拉伸测试在内的多个表征过程。获得的数据用于对具有不同几何形状但具有相似加载和边界条件（代表其运行条件）的膜的静态行为进行建模。该建模过程采用有限元法。主要目的是研究几何形状如何影响膜的承载能力。除了膜建模外，还使用具有六边形和矩形孔阵列的代表性单元（RE）对其材料进行建模，以了解孔隙率对机械性能的影响。通过对结果的探索，发现最佳几何形状为长径比为4的椭圆形膜，而最佳的RE为六边形阵列，其预测弹性性能的近似误差为12%。
