A STUDY ON AMINATED PVC/OXIDIZED MULTIWALL CARBON NONATUBE COMPOSITE MATERIALS

Abstract

A stable PVC is produced by combining 3-(dimethylamino)-1-propylamine with PVC via nucleophilic substitution. The amount of amine compound bound to PVC per mole was determined as 14.5% by titration. Four different combinations (8 wt%, 11 wt%, 13 and 17 wt% oxidized MWCNTs) were prepared using amino PVC and MWCNT containing cross-linking acidic groups on the surface (oxidized MWCNT). PVC, amino-PVC and composites were characterized using FT-IR spectroscopy. SEM-EDX analysis of amine PVC and SEM images of PVC/8% oxidized MWCNT and PVC/17% oxidized MWCNT. Differential scanning calorimetry (DSC) measurements show that amine substitution in PVC lowers the glass transition temperature (Tg) of PVC. Amine reactions can also reduce the stability of PVC. Oxidizing MWCNT slightly increased the stability of amine PVC, but the thermal stability of the composite was lower than that of PVC. The low-frequency dielectric constant decreases with increasing applied field and then remains constant. The dielectric constant of the composites increases with increasing temperature, except for the material containing 17% oxidized MWCNTs. The AC performance of all compounds increased rapidly with increasing frequency to 800 Hz at room temperature and then gradually increased to 4000 Hz. The ac conductivity of all compounds remains almost constant between 310 and 360 K as the temperature increases.