Yang Dan, Kong Xinxin, Ni Yufeng, Ruan Mengnan, Huang Shuo, Shao Puzhen, Guo Wenli, Zhang Liqun
Department of Material Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.
Beijing Key Lab of Special Elastomeric Composite Materials, Beijing 102617, China.
Polymers (Basel). 2019 Jan 27;11(2):218. doi: 10.3390/polym11020218.
In this work, graphene nano-sheets (GNS) functionalized with poly(dopamine) (PDA) (denoted as GNS-PDA) were dispersed in a carboxylated nitrile butadiene rubber (XNBR) matrix to obtain excellent dielectric composites via latex mixing. Because hydrogen bonds were formed between ⁻COOH groups of XNBR and phenolic hydroxyl groups of PDA, the encapsulation of GNS-PDA around XNBR latex particles was achieved, and led to a segregated network structure of filler formed in the GNS-PDA/XNBR composite. Thus, the XNBR composite filled with GNS-PDA showed improved filler dispersion, enhanced dielectric constant and dielectric strength, and decreased conductivity compared with the XNBR composite filled with pristine GNS. Finally, the GNS-PDA/XNBR composite displayed an actuated strain of 2.4% at 18 kV/mm, and this actuated strain was much larger than that of pure XNBR (1.3%) at the same electric field. This simple, environmentally friendly, low-cost, and effective method provides a promising route for obtaining a high-performance dielectric elastomer with improved mechanical and electrochemical properties.
在本工作中，用聚多巴胺（PDA）功能化的石墨烯纳米片（GNS）（表示为GNS-PDA）通过乳液混合分散在羧化丁腈橡胶（XNBR）基体中，以获得优异的介电复合材料。由于XNBR的-COOH基团与PDA的酚羟基之间形成了氢键，实现了GNS-PDA在XNBR乳胶颗粒周围的包覆，导致在GNS-PDA/XNBR复合材料中形成了填料的隔离网络结构。因此，与填充原始GNS的XNBR复合材料相比，填充GNS-PDA的XNBR复合材料显示出改善的填料分散性、增强的介电常数和介电强度以及降低的电导率。最后，GNS-PDA/XNBR复合材料在18 kV/mm下的驱动应变为2.4%，并且该驱动应变在相同电场下远大于纯XNBR的驱动应变（1.3%）。这种简单、环保、低成本且有效的方法为获得具有改善的机械和电化学性能的高性能介电弹性体提供了一条有前景的途径。
