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N-1-ALKYLITACONAMIC ACIDS-CO-STYRENE COPOLYMERS. 1. SYNTHESIS, CHARACTERIZATION AND MONOMER REACTIVITY RATIOS

2000; Taylor & Francis; Volume: 37; Issue: 1-2 Linguagem: Inglês

10.1081/ma-100101079

1520-5738

Marcela Urzúa, Nicolás Gatica, Ligia Gargallo, Deodato Radić,

Thermal and Kinetic Analysis

Abstract Copolymers containing N-1-ethylitaconamic acid, N-1-propyl-itaconamic acid, N-1-butylitaconamic acid, N-1-hexylitaconamic acid, N-1-octylitaconamic acid and N-1-decylitaconamic acid with styrene of different comonomer compositions were synthesized and characterized. Copolymer composition was determined by elemental analysis following the nitrogen content in the resulting copolymers. Monomer reactivity ratios r1 and r2 of the different copolymers were estimated using straight line intersection procedures such as Fineman-Ross (F-R) and Kelen-Tüdos (K-T) and by a nonlinear one, according to the reactivity ratios error-in-variables model (RREVM). Good agreement between the different procedures for r1 and r2 determination was found. Differences in the reactivity of N-1-alkylitaconamic acids (NAIA) relative to styrene were found i.e., ethyl and propyl derivative are less reactive with itself than butyl, hexyl, octyl, and decyl derivatives with itself. Copolymers with some tendency toward small block formation are found. ACKNOWLEDGEMENTS We express our thanks to Fondo Nacional de Desarrollo Científico y Tecnológico (Fondecyt), project 8970011 for partial financial support. M.Urzúa acknowledges CONICYT for a Graduate Fellowship and Fondecyt, project 2970009 for partial financial help. D. Radic thanks Cátedra Presidencial en Ciencias '95 for financial help.