Darwish Mohamed S A, Al-Harbi Laila M
Egyptian Petroleum Research Institute, 1 Ahmed El-Zomor Street, El Zohour Region, Nasr City, Cairo 11727, Egypt.
Chemistry Department, Faculty of Science, King Abdul-Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Polymers (Basel). 2021 Dec 2;13(23):4231. doi: 10.3390/polym13234231.
Volatile organic compounds pollute the environment and pose a serious threat to human health due to their toxicity, mutagenicity, and carcinogenicity. In this context, it is highly desirable to fabricate high-performance poly (dimethylsiloxane) (PDMS) composites to remove organic solvents from the environment using a simple technique. Therefore, in the present study, Fe-PDMS composites were fabricated using a technique based on magnetic induction heating with iron particles serving as a self-heating agent. Under an alternating magnetic field, the iron particles served as a thermal source that assisted in the progression of PDMS crosslinking. The influence of self-heating iron on the properties of the fabricated Fe-PDMS composites was also investigated. The hydrosilation reaction occurring during the crosslinking process was controlled using FT-IR. The heating efficiency of PDMS 1, PDMS 2, and PDMS 3 was studied as the function of induction time (0-5 min) and the function of iron content (0%, 1%, and 30% wt.%). The results revealed that the mechanical properties of the PDMS 2 composite were enhanced compared to those of the PDMS 1 and PDMS 3 composites. The mechanical properties of PDMS 3 were the least efficient due to cluster formation. PDMS 3 exhibited the highest thermal stability among all composites. Furthermore, the swelling behavior of different materials in various organic solvents was studied. PDMS was observed to swell to the greatest extent in chloroform, while swelling to a large extent was observed in toluene, pentane, and petroleum ether. PDMS swelling was the least in n-butanol. The elastomeric behavior of crosslinked PDMS, together with its magnetic character, produces stimuli-responsive magneto-rheological composites, which are quite efficient and suitable for applications involving the removal of organic solvents.
挥发性有机化合物污染环境，因其毒性、致突变性和致癌性对人类健康构成严重威胁。在此背景下，非常需要使用简单技术制备高性能聚二甲基硅氧烷（PDMS）复合材料以从环境中去除有机溶剂。因此，在本研究中，采用基于磁感应加热的技术制备了Fe-PDMS复合材料，其中铁颗粒用作自热剂。在交变磁场下，铁颗粒作为热源促进了PDMS交联的进行。还研究了自热铁对制备的Fe-PDMS复合材料性能的影响。使用傅里叶变换红外光谱（FT-IR）控制交联过程中发生的硅氢加成反应。研究了PDMS 1、PDMS 2和PDMS 3的加热效率与感应时间（0 - 5分钟）以及铁含量（0%、1%和30%重量百分比）的关系。结果表明，与PDMS 1和PDMS 3复合材料相比，PDMS 2复合材料的力学性能得到了增强。由于团聚形成，PDMS 3的力学性能效率最低。PDMS 3在所有复合材料中表现出最高的热稳定性。此外，研究了不同材料在各种有机溶剂中的溶胀行为。观察到PDMS在氯仿中溶胀程度最大，而在甲苯、戊烷和石油醚中溶胀程度较大。PDMS在正丁醇中的溶胀最小。交联PDMS的弹性行为及其磁性产生了刺激响应性磁流变复合材料，这些复合材料非常有效且适用于涉及去除有机溶剂的应用。
