The modification of ABS resin by introducing metal salts of unsaturated acids

Abstract

Graft polymerization of methacrylic acid onto ABS resin was carried out using BPO as an initiator in THF solution. Degree of grafting increased with reaction time and reached 35% in 10 hrs. Carboxyl groups were converted to carboxylates (metal salts) by refluxing MAA-g-ABS and the metal acetate in THF. In the solid graft polymers in solid, the infrared absorption of the asymmetrical C= O vibration of the carboxylic acid shifted to lower wavenumbers with increasing metal ion concentration. The absorption peak for the carboxylate anion is shifted to higher wavenumbers with the increase of alkali metal ion concentration, however, for the Mg²⁺ salt, it is shifted to lower wavenumbers. The surface and volume resistivities of the K⁺ and Na⁺ salts of MAA-g-ABS were 9.0 × 10⁹ Ω□ and 9.5 × 10⁹ Ω at 80% neutralization, respectively, and decreased with alkali metal ion concentration. The electric resistance of Li⁺, Mg²⁺ and Zn²⁺ salts decreased only slightly. The modulus of the K⁺ salt of MAA-g-ABS decreased with neutralization, whereas in Li⁺, Mg²⁺ and Zn²⁺ salts, the modulus increased with increasing metal ion concentration.