Synthesis and processing of the (ethylene-vinyl acetate-vinyl alcohol) terpolymer and its blends with a polyamide and styrene copolymers
Por:
Flores M., Hernandez G., Escobar A., Cardoso J., Palma A., Maciel A., Sanchez E., Manero O.
Publicada:
1 ene 1998
Resumen:
In this article, the synthesis and properties of the (ethylene-vinyl acetate-vinyl alcohol) terpolymer are studied in detail. A transesterification reaction with alcohols was conducted on poly (ethylene-vinyl acetate) to obtain terpolymers with varying hydroxide contents through three different routes: in solution, in a mixing chamber, and in a twin-screw extruder. The kinetics of the reaction in the mixing chamber are compared with those of the twin-screw extruder. Mechanical and rheological properties of the terpolymer are examined as a function of conversion. Blends of the terpolymer with polyamide (Nylon-6) were prepared for various compositions. They show a steep reduction in the equilibrium torque with respect to that of the polyamide. A region of compatibility at high polyamide contents gives rise to an increase of some mechanical properties above the simple mixing rule (Young's modulus). On the other hand, blends with poly(styrene-acrylonitrile) and poly(styrene maleic anhydride) show a region of compatibility at equal proportions of the styrene copolymers and with 10% terpolymer content, induced by the reaction of the hydroxide and maleic anhydride groups. This reaction is inhibited at high styrene-acrylonitrile concentrations due to interference presented by the effect of interactions between the maleic anhydride and acrylonitrile groups. © 1998 John Wiley & Sons, Inc.
Filiaciones:
Flores M.:
Departamento de Física, Univ. Auton. Metropolitana-I., A.P. 55-534, México, D.F. 09340, Mexico
Hernandez G.:
Departamento de Física, Univ. Auton. Metropolitana-I., A.P. 55-534, México, D.F. 09340, Mexico
Escobar A.:
Depto. de Ing. de Procesos e Hidr., Univ. Auton. Metropolitana-I., A.P. 55-534, Mexico, D.F. 09340, Mexico
Cardoso J.:
Departamento de Física, Univ. Auton. Metropolitana-I., A.P. 55-534, México, D.F. 09340, Mexico
Palma A.:
Inst. de Invest. en Materiales, UNAM, A.P. 70-360, México, D.F. 04510, Mexico
Maciel A.:
Inst. de Invest. en Materiales, UNAM, A.P. 70-360, México, D.F. 04510, Mexico
Sanchez E.:
Inst. de Invest. en Materiales, UNAM, A.P. 70-360, México, D.F. 04510, Mexico
Manero O.:
Inst. de Invest. en Materiales, UNAM, A.P. 70-360, México, D.F. 04510, Mexico
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