Study of polarization and relaxation phenomena of polyblend films of poly(vinyl chloride) and poly(methyl methacrylate)

Abstract

Thermally stimulated discharge current (TSDC) studies were carried out on pure poly(methyl methacrylate), poly(vinyl chloride) and polyblends (of various weight ratios, 100:0, 90:10, 80:20 and 70:30) as a function of polarizing fields at constant temperature, to study the polarization and relaxation phenomena in them. For PVC and different blends a peak around 140-180 • C and for PMMA two peaks at around 95 and 165 • C were observed. No regular variation in peak position for PMMA and blends was observed. The various TSDC parameters i.e. activation energy, charge released and relaxation times were calculated. In the blend samples it is suggested that the chains are so entangled that in the total polarization the dipolar contribution is less and the observed polarization seems to be mainly due to the formation of induced dipoles and an increase in free volume and mobility of charge carriers due to a plasticization effect. Keywords. Poly(methyl methacrylate); poly(vinyl chloride); thermally stimulated discharge current; induced dipole polarization; dipolar and space charge mechanism; plasticization effect.

Thermally stimulated depolarization current characteristic of EVA–conductive PPy composites

“…TSDC technique has proven to be a powerful tool to understand defect properties both qualitatively and quantitatively. [15][16][17] There has been previous study on this three-phase composite (EVA/PPy/CB). 18,19 In this paper, we consider composite containing EVA with different concentrations of PPy loaded with 20% high abrasion furnace (HAF) carbon black, and utilizing TSDC technique as an external stimulus, we try to investigate charge storage phenomena and the effect of stress fields on EVA-PPy composite.…”

Effects of compatibilizer on the morphological, mechanical, and rheological properties of poly(methyl methacrylate)/poly(N‐methyl methacrylimide) blends

“…Therefore, many studies concerning polymer blending and composites have been carried out over the last few decades. Several studies have been done on polymer blends and composites of poly(methyl methacrylate) (PMMA) with other polymers or fillers, such as poly(vinylidene fluoride), polyamide‐6, polystyrene (PS), poly(styrene‐ co ‐acrylonitrile) (SAN), polycarbonate, poly(vinyl chloride), poly(ethylene terephthalate), poly(lactic acid), polyethylene, polypropylene, poly(propylene carbonate), poly(ethylene oxide), and various types of fillers such as carbon nanotubes and graphene …”