Novel composites were synthesized using AEPTES （3-（2-aminoethylamino）propyltriethoxysilane）, which behaves as an excellent dispersant for MWCNTs （multiwall carbon nanotubes） in polymer film matrices. The thickne...Novel composites were synthesized using AEPTES （3-（2-aminoethylamino）propyltriethoxysilane）, which behaves as an excellent dispersant for MWCNTs （multiwall carbon nanotubes） in polymer film matrices. The thickness of the synthesized nanocomposite films ranged from 50 to 70 lam, having well-dispersed MWCNTs. Increasing the AEPTES concentration from 0.0196 to 0.0300 M, increased the amine content and the dispersion of MWCNTs. The film synthesized at 0.0300 M AETPES exhibited the greatest degree of dispersion among the three samples, which is consistent with a self-assembled silane group interacting with the MWCNT surface.展开更多
Force closure and stability problems exist in heavy gripping devices.Based on a typical gripping device for forging operations, the workpiece and the gripping device are innovatively considered as a single mechanism i...Force closure and stability problems exist in heavy gripping devices.Based on a typical gripping device for forging operations, the workpiece and the gripping device are innovatively considered as a single mechanism in this paper,and its global topological configuration is obtained.The changing element method is used to establish the optimized topology geometry of the gripping device by decreasing the degrees of freedom of the gripping mechanism and improving the force closure performance. Therefore,a new idea for the innovative design of heavy-duty forging gripping devices is provided.As the effect of revolute joint friction on loading capacity of the gripping device cannot be ignored,a unified mechanical equation including friction in terms of the topological adjacency matrix is established to analyze the force closure performance and calculate the loading capacity.The conclusions are provided by experiments.展开更多
文摘Novel composites were synthesized using AEPTES （3-（2-aminoethylamino）propyltriethoxysilane）, which behaves as an excellent dispersant for MWCNTs （multiwall carbon nanotubes） in polymer film matrices. The thickness of the synthesized nanocomposite films ranged from 50 to 70 lam, having well-dispersed MWCNTs. Increasing the AEPTES concentration from 0.0196 to 0.0300 M, increased the amine content and the dispersion of MWCNTs. The film synthesized at 0.0300 M AETPES exhibited the greatest degree of dispersion among the three samples, which is consistent with a self-assembled silane group interacting with the MWCNT surface.
文摘Force closure and stability problems exist in heavy gripping devices.Based on a typical gripping device for forging operations, the workpiece and the gripping device are innovatively considered as a single mechanism in this paper,and its global topological configuration is obtained.The changing element method is used to establish the optimized topology geometry of the gripping device by decreasing the degrees of freedom of the gripping mechanism and improving the force closure performance. Therefore,a new idea for the innovative design of heavy-duty forging gripping devices is provided.As the effect of revolute joint friction on loading capacity of the gripping device cannot be ignored,a unified mechanical equation including friction in terms of the topological adjacency matrix is established to analyze the force closure performance and calculate the loading capacity.The conclusions are provided by experiments.
