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vol.47 número1CYCLIZATION PROCEDURES TOWARD THE SYNTHESIS OF SOME CONFORMATIONALLY RESTRICTED NITROGEN HETEROCYCLESESTUDIO DE LA COPOLIMERIZACIÓN POR INJERTO DE ACRILONITRILO EN FIBRA CELULOSICA SECUNDARIA índice de autoresíndice de assuntospesquisa de artigos
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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

LISPERGUER, JUSTO  e  DROGUETT, CYNTHIA. CARACTERIZACION DEL CURADO DE RESINAS UREA FORMALDEHIDO POR CALORIMETRÍA DIFERENCIAL DE BARRIDO (DSC). Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.1, pp.33-38. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442002000100007.

Urea Formaldehyde resins were prepared in a two step condensations process with molar ratios of Formaldehyde / Urea that fluctuated between 1.10 - 1.40. The thermal behavior of the curing process was studied by Differential Scanning Calorimetry (DSC) under different environmental conditions. The DSC thermograms of UF resins, with NH4Cl as catalyst, showed that main crosslinking reactions, for resins with low molar formaldehyde levels, took place at 100ºC. Crosslinking reactions, for resins without catalyst or with high formaldehyde molar ratios, took place at temperature between 120 - 180ºC

Palavras-chave : Urea Formaldehyde resin; curing; exothermic reactions; Differential Scanning Calorimetry.

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