Dioxybiphenyl and chiral dioxybinaphthyl polyphosphazene random copolymers carrying carboxylic acids and their reactions with ?-caprolactam to form nylon-6-branched phosphazene materials

Carriedo G.A.; Alonso F.J.G.; Valenzuela C.D.; Valenzuela, M. L.

Keywords: hydrolysis, spectroscopy, electron, polymerization, synthesis, hydrogen, crystallization, acids, ring, ray, microscopy, resonance, copolymers, nuclear, bonds, diffraction, phosphazene, polyamides, secondary, analysis, crosslinking, magnetic, opening, differential, calorimetry, scanning, trimers, cyclic, X, (chemical), reactions, carboxylic, Phenoxycarboxylic

Abstract

The phosphazene polymers carrying phenoxycarboxylic acids {[NP(O-C 6H 4-CO 2H) 2] x[NP-(O 2C 12H 8)] 1-x} n [x = 0.2 (1a), 0.35 (1b), 0.5 (1c), 0.7 (1d), 0.85 (1e), x = 1(2)] and the chiral analogues {[NP(O-C 6H 4-CO 2H) 2] x[NP(O 2C 20H 12)] 1-x} n [x = 0.2 (3a), 0.45 (3b), 0.7 (3c)] (O 2C 12H 8 = 2,2'-dioxybiphenyl, O 2C 12H 12 = R-2,2?dioxy-1,1?-binaphthyl) have been synthesized by hydrolysis of the corresponding precursors with [NP(O-C 6H 4-CO 3Pr) 2] units. The new polymers have extensive H-bonding between the -COOH groups in the solid state, and those with x > 0.5 are very soluble in aqueous 0.5 M sodium carbonate. These polymers were used as initiators of the ring-opening polymerization of the ?-caprolactam (?-CL) at 230°C to give un-cross-linked polyphosphazenes, branched with short polyamide chains but having a fraction of the phosphazene units (from 20 to 35%) modified by secondary reactions. © 2005 American Chemical Society.

Más información

Título de la Revista: MACROMOLECULES
Volumen: 38
Número: 8
Editorial: AMER CHEMICAL SOC
Fecha de publicación: 2005
Página de inicio: 3255
Página final: 3262
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-17444393582&partnerID=q2rCbXpz