Nondestructive testing of defects in adhesive joints

Torque (dNm)
4. Costin, R. Selection of coagents for use in peroxide cured elastomers. Application
Bulletin 5519. Sartomer Company, USA.
Table-1 Comparitive physical properties of TPVs prepared by three different coagents
Compound Name DC0 DC10 DC20 DC30 DA10 DA20 DA30 DM10 DM20 DM30
EOC 100 100 100 100 100 100 100 100 100 100
PP 50 50 50 50 50 50 50 50 50 50
DCP* 3.38 3.38 3.38 3.38 3.38 3.38 3.38 3.38 3.38 3.38
#
TAC/TMPTA/HVA-2 - 10 20 30 10 20 30 10 20 30
Physical properties DC0 DC10 DC20 DC30 DA10 DA20 DA30 DM10 DM20 DM30
Tensile strength (MPa)
7.6 9.7 9.3 8.2 10.5 10 11.2 10.6 10.9 11.4
Elongation at break (%)
258 244 180 142 300 300 277 280 254 234
100% Modulus (MPa)
6.6 7.3 7.7 7.5 7.2 7.2 7.7 7.5 7.9 8.4
Tear strength (N/mm)
65 68 72.2 63 80.5 82 64 76.3 87.2 88.1
*Peroxide concentration has been optimized in the previous
work at 3.38 phr of DCP corresponds to 5 milliequivalent concentration.
#
Coagent concentration are in milliequivalent
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
00:00 05:00 10:00 15:00 20:00 25:00 30:00
Storage modulus (KPa)
Time (m:s)
100
10
1
0.1
RDC0
RDC20
RDA20
RDM20
Figure -1:
Rheograms of only EOC compound with 20
meq concentration of various coagents at 180°C
1 10 100 1000
Strain amplitude (%)
PP+EOC
DC0
DC20
DA20
DM20
.
Figure -2: SEM photomicrograph of PP/EOC
TPVs (PP phase is preferentially etched)
Figure -3: Dependence of G’ on strain amplitude at a
constant frequency of 1 Hz at 180°C
5