English to French Tech/Engineering Chemistry; Chem Sci/Eng

The mechanical properties of the membranes prepared in examples 1-10 and the comparative example are measured and compared, the measurement results are shown in Table 2.
Mechanical property test:
Test instrument: Paper and paper board tensile tester ZL-100A
Test steps:
Firstly, a to-be-tested membrane sample is cut into a shape adapted to the tester and a scale distance is marked with two marking lines;
Secondly, the cut membrane sample is placed in the holder of the tester, and is carefully adjusted to a symmetric position to allow the stretching force to be uniformly distributed on the cross section of the membrane sample;
Finally, the tester is started, and the maximum force (with the error of ±1%) at which the membrane sample is broken and the distance (with the error of ±1.25 mm) between the inner sides of the two marking lines are recorded.
The mechanical property can be calculated as below:
(Equation 1) P(MPa) =F/A
wherein, P is average tensile strength, F is maximum force at break, and A is average initial cross section area,
(Equation 2) alpha (%) = ((L-L0)/L0)x100
wherein, is elongation at break, is scale distance at break, and is initial scale distance.