Utilize este identificador para referenciar este registo: http://hdl.handle.net/10198/344
Título: A general kinetic analysis of non-linear irreversible copolymerizations
Autor: Costa, Mário Rui
Dias, Rolando
Palavras-chave: Non-linear
Polymerizations
Data: 1994
Editora: Elsevier
Citação: Costa, Mário; Dias, Rolando (1994) - A general kinetic analysis of non-linear irreversible copolymerizations. Chemical Engineering Science. ISSN 0009-2509. 49:4, p.491-516
Resumo: Irreversible non-linear copolymerizations with arbitrarily great numbers of monomers are described specifying the stoichiometric coefficients of the reactions involving end-groups. Rate equations for the vectorial generating function or discrete transform of the distribution of end-groups and repeating units and its derivatives with respect to logarithms of Laplace parameters can thus be written. Similar rate equations can be written for the discrete transforms of the distributions of descendants of each linking group with respect to their numbers of end-groups. This allows the prediction of gel properties, such as the concentration of elastically active network chains and mass fraction of pendant material. Mass balance equations using these rate laws are non-linear partial differential equations solvable by the method of characteristics. Numerical methods are developed for computing molecular weight distributions and average molecular weights before and after gelation, as well as the weight fraction of sol ang gel properties related to its elasticity behaviour. The curing of a tetraepoxide with a primary diamine is taken as a case study and results are compared with predictions by the theory of branching processes.
Peer review: yes
URI: http://hdl.handle.net/10198/344
ISSN: 0009-2509
Versão do Editor: http://www.sciencedirect.com/science/journal/00092509
Aparece nas colecções:DTQB - Artigos em Revistas Indexados ao ISI/Scopus

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