A composite with resistance-strain response characteristics was obtained by blending multi-walled carbon nanotube (MWCNT) to modify chloroprene rubber (CR). With the increase of carbon nanotube content

the strength and stiffness of the material increased significantly. The conductive percolation threshold of MWCNT content is 4.75 wt%

and if the content exceeds this value

the MWCNT form a tunneling conductive network inside the rubber matrix

and thus the material has conductive ability. The resistance-strain response test analysis of the material under static and cyclic loading shows that when the content of MWCNT is 8 wt%

the resistance-strain response gauge factor GF>418

showing good strain sensing characteristics. With the increase of MWCNT content

GF value decreases gradually

and the stability of resistance-strain response decreases

and shoulder peak effect appears

which proves that excessive carbon nanotube content has an adverse effect on the damage and reconstruction of conductive network with deformation. Finally

the mechanism of above resistancestrain response was analyzed by digital image correlation (DIC) method and the theoretical model of electron tunneling effect.