Rheological character, the thermo-oxidative resistance and the solvent resistant of PVC/DOP/organoclay nanocomposite.

Abstract

Poly(vinyl chloride)!dioctyl phthalatelorganoclay nanocomposites with varied amounts of organoclay are prepared hy melt intercalation. The rheological character of the composites is measured on rheometer C-VOR 150. The tensile strength (a) and the elongation at break (E) of the materials are determined with tester WPM. Their ihermo-oxidative resistance is evaluated after testing the samples at 100"C in 168 hours. The solvent resistance of the materials is determined hy immersing the samples in toluene - acetone mixture at room temperature in 168 hours. The obtained results show that the storage modulus and complex modulus of the materials with a small amount of organoclay are higher than those of the materials without organoclay and reach the maximal values at loading 1 wt.% organoclay. Generally, the thermo-oxidative resistance and solvent resistance of the composites containing organoclay are dramatically improved. Specially, the composite containing 1.5 wt.% organoclay has the best solvent resistance. The materials without organoclay have thermo-oxidation resistance lower than materials with different content of organoclay. These confirm the effective harrier ability of organoclay in PVC matrix.