On the Tensile Tests of Polyurethane and Its Composites with Carbon Nanotubes

Table 1

Activation volumes of specimens of neat PU.

Strain (%)	7.4	10.9	14.3	17.6	20.6	10.9	20.6
	Vr (nm^3)					Vsrj (nm^3)
Sample A	2.74	2.75
Sample B	2.56	2.50	2.36	2.17	2.11	0.94	0.97
Sample C	3.61	3.42	3.31	3.17	3.03
Sample D	5.75	5.39	5.10	4.72	4.05	1.83	1.95
Sample E	19.27	18.06	16.35	15.49	14.83	4.03	3.89

V_r is measured by stress relaxation test and V_srj by strain rate jumps. Specimens are marked as in Figure 4.