PSI - Issue 5

L. ALEXANDRESCU et al. / Procedia Structural Integrity 5 (2017) 667–674 Laurentia Alexandrescu/ Structural Integrity Procedia 00 (2017) 000 – 000

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Table 3. Physical-mechanical characterization after thermo-oxidative aging for 168h at 70°C Symbol N 10 N 11 N 12 N 13 N 14 N 15

N 16

N 17

N 18

Accelerate aging 168h la 70 0 C

Hardness 0 Sh A SR ISO 7619-1:2011

98

98

98

98

98

98

98

98

98

Elasticity % ISO 4662:2009

24

24

24

24

24

26

28

32

24

Tensile strength, N /mm 2 SR ISO 37:2012 Elongation at break, % SR ISO 37:2012 Residual elongation, % SR ISO 37:2012 Tear strength, N/mm SR EN 12771:2003

15,6

18

18,3

17,7

17,4

17,5

18,7

19,1

19,6

593

693

740

762

750

727

800

800

640

440

413

500

520

540

513

600

600

447

108,5 110,5 117

112,5

118,5

117

118,5

122,5

121

IR spectrum represent the radiant energy absorption curve in the IR domain by the sample molecule, depending on the wave length or radiation frequency. The infrared domain of the electromagnetic radiation is between 0.8 and 200 μm. IR domain for usual organic chemistry is between 2.5 and 25 μm. The structural determinations were carried out on an IR molecular absorption spectrometer with double beam, in the range of 4000-600 cm -1 , using 4200 FT-IR equipped with ATR diamond crystal and sapphire head. The solid state samples were set in the ATR and the equipment recorded the transmittance spectra of the sample and then compared it with the background spectra previously recorded. The recorded spectra of the samples were compared with the pure elastomer spectrum. After the test were carried out, the following were fond : - PE and EPDM as such;

Figure 4 FT- IR spectrum from EPDM