TMPT at the 4 phr level shows no effect on cure speed, however a 35% increase from 0.14 to 0.19 dN[center dot] m/sec is observed at the 8 phr level.
The TAIC also caused an increase in the Young's modulus, as did the 8 phr level of TMPT (table 2).
At an 8 phr level, the HV2 and the TMPT showed significant improvements over the control compound.
When the 8 phr compounds were evaluated, TMPT, SR500 and SR517 had improved elongation retention versus the control compound after 70 hours at 150[degrees] C.
The TMPT material provided distinct improvements in viscosity reduction, modulus and cure speed versus the control material.
Optimum radiation dose and amount of TMPT To determine the optimal radiation dose in relation to the effect of the amount of coactivator, EPDM type A was chosen (see table 3).
The relationship between tensile strength, 300% modulus, elongation at break or hardness and amount of coactivator (TMPT) as a function of the radiation dose were plotted.
At a TMPT content of 10 phr, however, this product has reached its solubility limit in the compound, and after being stored for a few days, the TMPT migrates out of the compound.
The 300% modulus (figure 3) increases with radiation dose, reaching a plateau at, again, a TMPT content of approximately 10 phr (supersaturation).
Most of this decrease takes place up to a radiation dose of approximately 100 kGy and a TMPT content of 10 phr.
From the 300% modulus it can be established that there is no or hardly any difference between the use of EDMA and of TMPT. Both compounds do have a greater effect than either 1,3-BDDMA or 1,6-HDDMA.
The decrease in the elongation at break reveals no difference between using EDMA and TMPT, while the other methacrylates investigated did not differ from one another in terms of elongation at break.