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vol.51 número1SYNTHESIS OF 2-ARYL-1,3-PROPANEDIAMINES USING A ONE-POT KNOEVENAGEL-MICHAEL SEQUENCEMORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES índice de autoresíndice de materiabúsqueda de artículos
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Journal of the Chilean Chemical Society

versión On-line ISSN 0717-9707

Resumen

GATICA, NICOLÁS; FERNANDEZ, NATALÍ; OPAZO, ALEJANDRA  y  RADIC, DEODATO. SYNTHESIS AND CHARACTERIZATION OF FUNCTIONALIZED VINYL COPOLYMERS II: STRUCTURE-MONOMER REACTIVITY RELATIONSHIP IN COPOLYMERS CONTAINING 4-VINYLPYRIDINE MOIETIES. J. Chil. Chem. Soc. [online]. 2006, vol.51, n.1, pp.785-789. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072006000100007.

Copolymers containing 4-vinylpyridine as common monomer with tert-butyl acrylate and acrylic acid of different comonomer compositions were synthesized and characterized. Copolymer composition was determined by elemental analysis, from which monomer reactivity ratios (MRR, r) were estimated using straight line intersection procedures such as Fineman-Ross and Kelen-Tüdõs methods and a nonlinear one, the Reactivity Ratios Error in Variables Model. In this case, the values of MRR are r4VPy = 0.046 and rtBA = 0.054 (for 4VPy-co-tBA), and r4VPy = 0.0 and rAA = 0.610 (for 4VPy-co-AA). A copolymer tending to the alternation and another containing isolated units of one of the monomers between small blocks of the another one were obtained, depending on the chemical nature of the comonomers. The different proposed comonomer distributions are analyzed in terms of the obtained MRR values and compared with related systems. The MRR are connected with structural properties of the monomers such as polarity, aromaticity and electron delocalization

Palabras clave : functionalized vinyl copolymers; monomer reactivity ratios; comonomer sequence and distribution; 4-vinylpyridine.

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