Adhesion Characteristics of a Novel Synthetic Polydimethylsiloxane for Bionic Adhesive Pads  

作　　者：Qingsong He Min Yu Yang Li Xinlong Chen Hao Zhang Ling Gong Zhendong Dai 

机构地区：[1]Institute of Bioinspired Structure and Surface Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, P. R. China [2]College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, P. R. China [3]Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, P. R. China [4]Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh 5000, USA

出　　处：《Journal of Bionic Engineering》2014年第3期371-377,共7页仿生工程学报（英文版）

基　　金：Acknowledgments The authors would like to thank Mr Y. J. Xue for his help with the SEM measurements, Miss H. H. Zhao for her help in fabricating the graphene sheets, and Mr. X. D Sun for his help in measuring the elastic moduli of tile NPWC and NPWOC materials. This work was supported in part by the National Natural Science Foundation of China （Grant Nos. 51175251, 51275237 and 61161120323）, by the Natural Science Foundation of Jiangsu Province （Grant No. BK2011734）, by the Funding for Outstanding Doctoral Dissertation in NUAA （Grant No. BCXJ11-06）, by the Funding of Jiangsu Innovation Program for Graduate Education （Grant No. CXLX11_0178）, and by the Fundamental Research Funds for Central Universities.

摘　　要：Materials with appropriate adhesive properties are suitable for the fabrication of bionic adhesive pads. In this study, a novel polydimethylsiloxane （PDMS） material enhanced with two types of crosslinkers, carbon nanotubes and graphene sheets, was fabricated. The Contact Angle （CA） and cross-sectional morphology of the new material were investigated and observed using a CA meter and Scanning Electron Microscopy （SEM）, respectively. CA measurements indicate that the surface energy of the novel material is twice that of the common PDMS material. SEM observations show that carbon nanotubes and graphene sheets are well dispersed in the polymer, a feature that improves the mechanical properties of the new material. The adhesive performance of this novel composite was tested on an in-house fabricated friction machine. Results show that at a preload of only 50 mN, the adhesion of the novel PDMS material is up to -3.7 times that of common PDMS. The maximum macroscale shear strength and normal adhesion reach 4 N·cm^-2 and 1 N·cm^-2, respectively. The adhesive capability of the material is maintained even after hundreds of times of repeated use. This novel material exhibits excellent adhesion, sufficiently high elastic modulus and high repeatability at low preloads.Materials with appropriate adhesive properties are suitable for the fabrication of bionic adhesive pads. In this study, a novel polydimethylsiloxane （PDMS） material enhanced with two types of crosslinkers, carbon nanotubes and graphene sheets, was fabricated. The Contact Angle （CA） and cross-sectional morphology of the new material were investigated and observed using a CA meter and Scanning Electron Microscopy （SEM）, respectively. CA measurements indicate that the surface energy of the novel material is twice that of the common PDMS material. SEM observations show that carbon nanotubes and graphene sheets are well dispersed in the polymer, a feature that improves the mechanical properties of the new material. The adhesive performance of this novel composite was tested on an in-house fabricated friction machine. Results show that at a preload of only 50 mN, the adhesion of the novel PDMS material is up to -3.7 times that of common PDMS. The maximum macroscale shear strength and normal adhesion reach 4 N·cm^-2 and 1 N·cm^-2, respectively. The adhesive capability of the material is maintained even after hundreds of times of repeated use. This novel material exhibits excellent adhesion, sufficiently high elastic modulus and high repeatability at low preloads.

关 键 词：polymeric composite ADHESION carbon materials surface energy BIONIC 

分 类 号：TQ330.389[化学工程—橡胶工业] O634.41[理学—高分子化学]