Dielectric and mechanical properties of poly(vinyl chloride)–dioctylphthalate systems

Abstract

SynopsisThe mechanical properties, tensile strength, and elongation were investigated for poly(viny1 chloride) (PVC) samples mixed with dioctylphthalate (DOP) at concentrations from 0 to 100 parts per hundred parts PVC at 23°C. It was found that the tensile strength decreased with the increase of concentration, and the elongation was increased until a concentration of 30 DOP content, and then decreased. This leads to the suggestion that intermolecular plasticization is dominant until 30 DOP content, while interstructural plasticization is prevailing for higher concentrations. The permittivity E' and the dielectric loss factor E" of the same samples have been measured in the frequency range 102-106 Hz at temperatures from 3 to 96°C. Results show that as the DOP content increases in PVC, the dielectric absorption becomes broader, and the glass transition temperature T, is lowered. The magnitude of the loss peak decreases with an increase of DOP content to a minimum at concentrations from 40 to 60 DOP content. At higher concentrations the loss peak is increased and T, is unaltered. Another absorption was observed at 100 Hz and at high temperatures, which was attributed to Maxwell-Wagner effect or direct current conductivity or both of them. It was found that the sample containing 40 parts DOP in 100 parts PVC possesses the best mechanical and electrical properties.

Preparation and properties of some filled poly(vinyl chloride) compositions

“…It is evident from Figure 3, which represents the variation of ε′ with frequency at different temperatures, that the value of ε′ increases with increasing temperature and decreases with increasing frequency. Similar behavior was noticed before in the literature 16–19. The increase of ε′ with temperature can be explained by the increase in the mobility of polar groups, the decrease in density, and, hence, a decrease in the effect of the environment that facilitates the orientation of the mobile groups.…”

Electrical and mechanical properties of ethylene propylene diene monomer–chloroprene rubber blend loaded with white and black fillers

“…It is clear that the addition of PVC increases slightly the value of Ј for EPDM and for all the investigated blends except that of CR, which was found to be slightly decreased. This decrease may be due to the lower value of Ј for PVC (5.0 at f ϭ 1 kHz) 15 when compared with CR (6.3 at f ϭ 1 kHz). There was no pronounced change in Љ after the addition of PVC, as shown in Figure 1, when compared with those before the addition of PVC, as is also clear from the figure.…”

Studies of electrical and mechanical properties of poly(vinyl chloride) mixed with electrically conductive additives

“…Similar behavior was noticed before in the literature. [11][12][13][14] The increase of Ј with the temperature can be explained by the increase in the mobility of polar groups, the decrease in density, and hence a decrease in the effect of the environment that facilitates the orientation of the mobile groups. The decrease of Ј with the frequency may be caused by dielectric dispersion.…”