Mechanism of crack formation under elongation in carbon nanotube network embedded in polyurethane

0420922 - ÚH 2014 eng K - Conference Paper (Czech conference)
Slobodian, P. - Říha, Pavel - Benlikaya, R. - Olejník, R.
Mechanism of crack formation under elongation in carbon nanotube network embedded in polyurethane.
2013.
[3rd International Conference on Materials and Applications for Sensors and Transducers. Praha (CZ), 13.09.2013-17.09.2013]
Grant - others:UTB Zlín(CZ) IGA/FT/2013/018; UTB Zlin(CZ) IGA/FT/2012/022
Institutional research plan: CEZ:AV0Z20600510
Institutional support: RVO:67985874
Keywords : carbon nanotube networks * polyurethyne * tensile deformation * network crack formation
Subject RIV: BK - Fluid Dynamics

A highly deformable composite composed of a network of electrically-conductive entangled carbon nanotubes embedded in elastic polyurethane for sensing tensile deformation by changes in strain has been prepared. The testing has shown the composite can be extended as much as 400 % during which the electrical resistance increases more than 270 times. The high strain sensing can be attributed to the network cracking upon extension. To understand the cracking mechanism and explain the resistance change, the structural changes of networks made of pristine as well as functionalized multiwalled carbon nanotubes were examined. The microscopic observation of crack formation and resistance change of the networks correlates well with the number of cracks.
Permanent Link: http://hdl.handle.net/11104/0231373