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vol.44 número4ESTUDIO DEL COMPORTAMIENTO CATALITICO DE LA HOMO Y COPOLIMERIZACION DE 1-OCTADECENO CON CATALIZADORES METALOCENOS RACEMICOS rac-Et(Ind)2ZrCl2 Y rac-Me2Si(Ind)2ZrCl2SINTESIS DE (±)11-ACETOXI DRIM-2,7-DIENO índice de autoresíndice de assuntospesquisa de artigos
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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

CATALAN, R.; NEIRA, A.; MELO, R.  e  RIVAS, B.L.. COPOLIMERIZACION POR INJERTO DE ACETATO DE VINILO EN FIBRA CELULOSICA SECUNDARIA. Bol. Soc. Chil. Quím. [online]. 1999, vol.44, n.4, pp.505-515. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16441999000400015.

Graft copolymers of vinylacetate on secondary cellulosic fiber were prepared by the use of iron(II)-hydrogen peroxide redox system as initiator, in aqueous medium. The graft copolymers were characterized by FT-IR spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The following parameters of the copolymerization reaction were studied: cellulose: vinylacetate reagents ratio, concentration Fe+2-H2O2, pH, temperature and time of reaction. Their effects on the system are also discussed. The grafting percent higher than 100% were obtained in the best condition of reation, with a heterogeneous distribution of synthetic polymer over the fiber surface

Palavras-chave : Secondary cellulosic fiber; graft copolymerization; vinylacetate; the iron(II)-hydrogen peroxide redox system; grafting percent.

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