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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

CATALAN S., R; NEIRA J., A.; RIVAS, B. L.  e  MELO S., R.. Polimerizacion de Injerto de Fibra Celulosica Secundaria con Metacrilato de Metilo y Metacrilato de Etilo. Bol. Soc. Chil. Quím. [online]. 2000, vol.45, n.3, pp.391-402. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442000000300009.

Graft copolymers on secondary fibre cellulosic with methylmethacrylate and ethylmethacrylate were synthesized by the use of Fe+2 ion-hydrogen peroxide redox system as initiator, in aqueous medium. The graft copolymers were characterized by elemental analysis, FT-IR spectroscopy, thermogravimetric analysis and scanning electron microscopy. The following parameters of the copolymerization reactions were studied: cellulose: acrylic ester reagents ratio, concentration Fe+2-H2O2, temperature, pH and time of reaction. Their effects on the system are also discussed. The most grafting percents were reached in the best condition of reaction. They were 120% for methylmethacrylate and 140% for ethylmethacrylate. The obtained products are fibrous, colours, soft, with different portion of comonomer and a heterogeneous distribution of synthetic polymer over the fibre surface

Palavras-chave : secondary cellulosic fibre; graft copolymerization; methylmethacrylate; ethylmethacrylate; ion (II)- hydrogen peroxide redox system; grafting percent.

        · resumo em Espanhol     · texto em Espanhol

 

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