Al-Harbi Laila M, Darwish Mohamed S A, Khowdiary Manal M, Stibor Ivan
Chemistry Department, King Abdulaziz University, 80203 Jeddah, Saudi Arabia.
Egyptian Petroleum Research Institute, 1 Ahmed El-Zomor Street, El Zohour Region, Nasr City, Cairo 11727, Egypt.
Polymers (Basel). 2018 May 7;10(5):507. doi: 10.3390/polym10050507.
The most challenging task in the preparation of poly(dimethylsiloxane) composites is to control the curing time as well as to enhance their thermal and swelling behavior. Curing rate can be modified and controlled by a range of iron powder contents to achieve a desired working time, where iron is used as self-heating particles. Iron under alternative current magnetic field (ACMF) is able to generate thermal energy, providing a benefit in accelerating the curing of composites. Three types of iron-Poly(dimethylsiloxane) (Fe-PDMS) composites were prepared under ACMF with iron content 5, 10, and 15 wt %. The curing process was investigated by FTIR, while the morphology and the thermal stability were examined by SEM, DMA, and TGA. The heating's profile was studied as functions of iron content and induction time. It was found that the time required to complete curing was reduced and the curing temperature was controlled by varying the iron content and induction time. In addition, the thermal stability and the swelling behavior of the prepared composites were enhanced in comparison with the conventional PDMS and thus offer a promising route to obtain thermally stable composites.
制备聚二甲基硅氧烷复合材料最具挑战性的任务是控制固化时间以及改善其热性能和溶胀行为。固化速率可以通过一系列铁粉含量进行调节和控制，以达到所需的工作时间，其中铁用作自热颗粒。在交变磁场（ACMF）下，铁能够产生热能，这有利于加速复合材料的固化。在ACMF下制备了三种铁含量分别为5 wt%、10 wt%和15 wt%的铁-聚二甲基硅氧烷（Fe-PDMS）复合材料。通过傅里叶变换红外光谱（FTIR）研究固化过程，通过扫描电子显微镜（SEM）、动态热机械分析（DMA）和热重分析（TGA）研究形态和热稳定性。研究了加热曲线与铁含量和感应时间的关系。结果发现，通过改变铁含量和感应时间，可以缩短完成固化所需的时间并控制固化温度。此外，与传统聚二甲基硅氧烷相比，所制备复合材料的热稳定性和溶胀行为得到了改善，从而为获得热稳定复合材料提供了一条有前景的途径。
