Grytsenko Oleksandr, Dulebova Ludmila, Suberlyak Oleh, Skorokhoda Volodymyr, Spišák Emil, Gajdoš Ivan
Department of Chemical Technology of Plastics Processing, Lviv Polytechnic National University, 12 St. Bandera, 79013 Lviv, Ukraine.
Department of Technologies, Materials and Computer Aided Production, Technical University of Košice, 74 Mäsiarska, 04001 Košice, Slovakia.
Materials (Basel). 2020 Oct 14;13(20):4580. doi: 10.3390/ma13204580.
This paper presents the research results of the copolymer structure and properties of 2-hydroxyethylmethacrylate (HEMA) with polyvinylpyrrolidone (PVP) and their hydrogels, obtained by block polymerization in the presence of iron sulfate (II). By the methods of chemical analysis, IR spectroscopy, Thermogravimetric (TG) and Differential Thermal Analysis (DTA), the course of grafted copolymerization of HEMA on PVP with the formation of a cross-linked copolymer was confirmed. The results received by scanning electron microscopy showed that due to the copolymerization of HEMA with PVP, macroporous hydrogels with a pore size of 10-30 μm were obtained. The peculiarities of the structure formation of the obtained copolymers depending on the initial composition formulation were established and their structural parameters were investigated: PVP grafting efficiency, PVP content in copolymer, molecular weight of internodal fragment of polymer network, crosslinking degree, and crosslinking density. The interrelation of sorption-diffusion, physical-mechanical and thermophysical properties along with the structure of the obtained materials was proved. It was shown that with the increasing PVP content in the original composition, the efficiency of its grafting and crosslinking density of the polymer network decreased, but the surface hardness, heat resistance, sorption capacity of copolymers in the dry state, as well as ion permeability and elasticity in the swollen state increased, while their tensile strength deteriorated. It is proved that by changing the original composition formulation it is possible to change the structure and hence the properties of the copolymers in the desired direction.
本文介绍了在硫酸亚铁（II）存在下通过嵌段聚合获得的甲基丙烯酸2-羟乙酯（HEMA）与聚乙烯吡咯烷酮（PVP）及其水凝胶的共聚物结构和性能的研究结果。通过化学分析、红外光谱、热重分析（TG）和差示热分析（DTA）等方法，证实了HEMA在PVP上接枝共聚形成交联共聚物的过程。扫描电子显微镜获得的结果表明，由于HEMA与PVP的共聚作用，得到了孔径为10 - 30μm的大孔水凝胶。确定了所得共聚物的结构形成特性取决于初始组成配方，并研究了它们的结构参数：PVP接枝效率、共聚物中PVP含量、聚合物网络节间片段的分子量、交联度和交联密度。证明了吸附 - 扩散、物理 - 机械和热物理性能与所得材料结构之间的相互关系。结果表明，随着原始组成中PVP含量的增加，其接枝效率和聚合物网络的交联密度降低，但共聚物的表面硬度、耐热性、干燥状态下的吸附容量以及溶胀状态下的离子渗透性和弹性增加，而其拉伸强度则变差。证明了通过改变原始组成配方，可以在期望的方向上改变共聚物的结构，从而改变其性能。
