DPGDA

AcronymDefinition
DPGDADipropyleneglycol Diacrylate (resins)
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In the case of PP/NR blend with DPGDA, we got the minimum value for the ratio of chain scission to crosslinking (0.66) as well as for the slope of the Charlesby--Pinner plot (125 kGy).
This trend was further enhanced by low molecular weight and low viscosity DPGDA for the blend having a PFM.
The influence of absorbed dose and DPGDA on the tensile strength and the elongation at break values are shown in Figures 10 and 11, respectively.
Finally, we found that the maximum tensile properties of the 50/50 blend of PP/NR with DPGDA were reached at a gel content of 33%.
In Figure 12, photomicrographs of blends with and without DPGDA are shown for the maximum tensile properties in comparison to the un-irradiated one.
This might be due to the preferential migration of the low viscous DPGDA into the interface leading to higher graft-linkage of that region during irradiation compared to the bulk volume of NR (Fig.
(3.) An electron treatment under nitrogen atmosphere with a maximum dose of 350 kGy did not influence the yield of functional groups of the blends with or without DPGDA.
Dipropylene glycol diacrylate (DPGDA, density: 1.06 g [cm.sup.-3] at 25[degrees]C) was supplied by Cytec, Brussels, Belgium.
All these radicals should react with one double bond of a DPGDA molecule to avoid the electron induced degradation of PP during the solid state irradiation.
wt(DPGDA) = wt(PP) * [N.sub.r] * [M.sub.n.sup.DPGDA] / [M.sub.n.sup.PP](2)
Table 10: Viscosity reducing power of selected diacrylate monomers blended with aliphatic urethane diacrylate oligomer (50:50 blend by weight) Formulation Viscosity (mPa.s) at 25[degrees]C Aliphatic urethane diacrylate (AUDA) 15,000 (supplier literature) AUDA + HDDA 172.0 [+ or -] 3.0 AUDA + DPGDA 332.5 [+ or -] 1.5 AUDA + TPGDA 416.0 [+ or -] 1.0 AUDA+ 1,3/1,4-CHDMDA 596.5 [+ or -] 1.5 AUDA + 3EO CHDMDA 970.5 [+ or -] 1.5 As Table 10 shows, 1,3/1,4-CHDMDA can significantly reduce the viscosity of the formulation and has superior reducing power compared to the alkoxylated cyclohexanedimethanol diacrylate.
Table 14: Summary of chemical resistance of 35 micron UV-cured coatings containing diacrylate monomer and photoinitiator applied on polycarbonate Chemicals & stains 1,3/1,4-CHDMDA HDDA TPGDA DPGDA 2PO NPGDA Tap water 0 0 1 0 2 Ethanol 1 0 2 1 2 4% Acetic acid 0 0 1 0 0 Black RIT[R] dye 0 2 3 2 4 5% NaOH 0 0 2 1 1 Yellow mustard 0 1 1 1 1 Betadine[R] 0 0 0 0 0 4% [NH.sup.4]OH 0 1 1 1 4 Total score 1 4 11 6 14 Chemicals & stains 3EO CHDMDA 5EO CHDMDA 5PO CHDMDA Tap water 0 2 1 Ethanol 1 1 2 4% Acetic acid 1 0 2 Black RIT[R] dye 4 5 5 5% NaOH 1 2 1 Yellow mustard 2 2 2 Betadine[R] 2 5 1 4% [NH.sup.4]OH 3 2 3 Total score 14 19 17 Conclusions