Figure 5: Relative change of electrical resistance versus tensile stress for MWNT network/PS composite subjected to 7 successive elongation/relaxation cycles (network thickness is about 20 μm; the filled and open symbols denote the extension part and the relaxation part of cycles, resp.). The solid circles represent the extension part of the first cycle and the full line the linear fitting of resistance change in subsequent cycles. The strain increase corresponds to the step increase of tensile stress 0.8, 1.9, 2.8, 4.3, 6.4, 9.2, 10.3, and 11.8 MPa, respectively.