Meng Yiming, Sharma Sushant, Chung Jin Suk, Gan Wenjun, Hur Seung Hyun, Choi Won Mook
School of Chemical Engineering, University of Ulsan, Daehakro 93, Namgu, Ulsan 44610, Korea.
Department of Macromolecular Materials and Engineering, College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Longteng Road 333, Shanghai 201620, China.
Polymers (Basel). 2022 Feb 28;14(5):967. doi: 10.3390/polym14050967.
Herein, an effective technique of curing reaction-induced phase separation (CRIPS) was used to construct a reduced graphene oxide (RGO) network in the immiscible diglycidyl ether of the bisphenol A/polyetherimide (DGEBA/PEI) polyblend system. The unique chemical reduction of RGO facilitated the reduction of oxygenated groups and simultaneously appended amino groups that stimulate the curing process. The selective interfacial localization of RGO was predicted numerically by the harmonic and geometric mean technique and further confirmed by field emission transmission electron microscopy (FETEM) analysis. Due to interfacial localization, the electrical conductivity was increased to 366 S/m with 3 wt.% RGO reinforcement. The thermomechanical properties of nanocomposites were determined by dynamic mechanical analysis (DMA). The storage modulus of 3 wt.% RGO-reinforced polyblend exhibited an improvement of ~15%, and glass transition temperature () was 10.1 °C higher over neat DGEBA. Furthermore, the total shielding effectiveness (SE) was increased to 25.8 dB in the X-band region, with only 3 wt.% RGO, which represents ~99.9% shielding efficiency. These phase separation-controlled nanocomposites with selective localization of electrically conductive nanofiller at a low concentration will extend the applicability of polyblends to multifunctional structural nanocomposite applications.
在此，采用一种有效的固化反应诱导相分离技术（CRIPS）在双酚A/聚醚酰亚胺（DGEBA/PEI）不相容共混体系的二缩水甘油醚中构建还原氧化石墨烯（RGO）网络。RGO独特的化学还原作用促进了含氧基团的还原，同时引入了刺激固化过程的氨基。通过调和平均和几何平均技术对RGO的选择性界面定位进行了数值预测，并通过场发射透射电子显微镜（FETEM）分析进一步证实。由于界面定位，添加3 wt.%的RGO增强后，电导率提高到366 S/m。通过动态力学分析（DMA）测定了纳米复合材料的热机械性能。添加3 wt.% RGO的共混物的储能模量提高了约15%，玻璃化转变温度（）比纯DGEBA高10.1℃。此外，在X波段区域，仅添加3 wt.%的RGO，总屏蔽效能（SE）就提高到了25.8 dB，这代表了约99.9%的屏蔽效率。这些在低浓度下具有导电纳米填料选择性定位的相分离控制纳米复合材料将扩大共混物在多功能结构纳米复合材料应用中的适用性。
