Evaporation kinetics of DIDP plasticizer from PVC

Abstract

The physical loss of diisodecyl phthalate (DIDP) plasticizer from PVC films of about 50 μm thickness has been investigated between 95 and 160°C in air by FTIR spectrophotometry and gravimetry. Complementary OIT measurements have been performed to follow the stabilizer depletion and to confirm that the dehydrochlorination of PVC remains negligible for all exposure durations under study. As expected for thin PVC films, the overall loss kinetics obeys a first order law, indicating that it is controlled by DIDP evaporation. The corresponding coefficient of DIDP evaporation obeys an Arrhenius law with an activation energy of about 96 kJ mol -1 . These results are in good agreement with those previously reported in the literature for other types of phthalate plasticizers of PVC.

Investigation of Hydrothermal Aging on Polyvinyl Chloride (PVC) Used in Medium Voltage Cables

“…The absorption bands observed in ATR-FTIR spectra before and after aging at 80 and 100℃ are given in Figure 11. In the spectrum of the untreated sample, the main peaks at 2850 -2950 cm -1 , 1255-1275 cm-1 , 1425-1458 cm -1 and 741 cm -1 , characteristic for a PVC structure, were found, which are attributed to C-H (valence), C-C (valence), C-H (deformation), and C-Cl valance bands, respectively [25][26][27][28][29][30][31][32]. In the FTIR spectra of PVC after treatment at 80℃ and 100℃, the intensity of the bands decreased as compared to the untreated sample.…”

Analysis of Plasticizer Evaporation from Locally Available Poly(vinyl chloride) Cable Insulations

“…[ 7 ] However, they use normal conditions to determine life expectancy. [ 8–10 ] Cables are usually placed via heat sources and move across regions that obstruct the heat dissipation, like ceilings and walls. In these situations, excessive heat cannot be avoided.…”