Complex-radical alternating terpolymerization of maleic anhydride, trans-stilbene and N-phenylmaleimide

• Published in: Macromolecular chemistry and physics 1995-06, Vol.196 (6), p.1999-2009
• Main Authors: Rzaev, Zakir M. O., Medyakova, L. V., Mamedova, M. A., Akovali, Güneri
• Format: Article
• Language: English
• Subjects: Applied sciences; Copolymerization; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; Preparation, kinetics, thermodynamics, mechanism and catalysts
• ISSN: 1022-1352; 1521-3935
• DOI: 10.1002/macp.1995.021960619

Radical terpolymerizations of maleci anhydride (MA), trans‐stilbene (Stb) and N‐phenylmale‐imide (PhMI) were carried out in methyl ethyl ketone (MEK) at 60–80°C in the presence of 2,2′‐azoisobutyronitrile (AIBN) as initiator. The terpolymerization was evaluated by using either the free monomer or complex participation models. The relative of MA toward poly(Stb) radical was found to be about 10,6 times lower than that of PhMl. The initial rate of copolymerization, the participation of the charge transfer complex (CTC) monomers and free monomers was quantitatively estimated. It was established that, even with a considerable change in the ratio of electron‐acceptor monomers (MA and PhMI) in the initial reaction mixture, terpolymers possessed always a composition ratio close to 1:2:1. Constants for copolymerization of MA…Stb (M1) and PhMI…Stb (M3) were determined by using the Kelen‐Tüdős equation, and r1 · K1/K3 = 0,03 and r2 · K3/1 =0,08, where K1 and K3 are complex‐formation constants of MA…Stb and PhMl…Stb complexes, respectively, were obtained. The result of kinetic studies of terpolymerization was interpreted as involving mainly alternating copolymerization of two complexomers with predominant participation in chain growth. Thermogravimetric analyses indicated the high thermal stabilities of terpolymers obtained.