In this research blending a terpolymer consisting of acrylonitril-vinyl acetat and 2-acrylamide and 2-methyl propane sulfonic acid (Amps) with vinyl polymers such as poly vinyl chloride and poly styrene was performed by solution method using dimethyl formamide. After the scanning electron microscopy was performed on the blended samples, and the observation of incompatibility in the acrylic and styrene terpolymer and also the semi-compatibility with poly vinyl chloride, two different copolymers of acrylonitril-styrene (SAN) with various content of acrylonitril (SAN 2 and SAN 5) were used as the compatibilizer between the two phases. In the first step, the compatibility of these copolymers with the acrylic terpolymer was investigated and then their compatibility role was studied on the terpolymer-vinyl polymer blends. Diverse tests including strength investigation, Scanning electron microscopy, differential scanning calorimetry and wide angle x-ray diffraction were performed on the different blended samples with fibers produced by electro-spinning method, showing incompatiblity in acrylic terpolymer-poly styrene compound and semi-compatiblity in acrylic terpolymer-poly vinyl chloride compound, and also shows that SAN 2 copolymer could not fulfill it's role as the compatibiliser in the acrylic terpolymer-poly vinyl chloride compound. The results of strength tests on the produced nano fibers from 15 wt-% solution of the compound in dimethyl formamide, showed a 10% improvement in the modulus of the acrylic termpolymer-poly vinyl chloride compound in comparison with the sole terpolymer. The SEM images showed the matrix-droplet morphology at the fracture surface of the thin polymer films. Keywords: acrylonitrile terpolymer, vinyl acetat, Amps, blend, Polyvinyl chloride, Polystyrene, Dimethylformamide
