Publicação

Characterisation of the surface lewis acid/base properties of poly(butylene terephthalate) by inverse gas chromatography

Detalhes bibliográficos
Resumo:	The surface of poly(butylene terephthalate) (PBT) was analysed by means of inverse gas chromatography (IGC). The specific component of the adsorption of polar probes on the surface of poly(butylene terephthalate) was found to be endothermic, and the change in the entropy of the system, positive, which is not a common case in IGC. An interpretation is given, based on the contribution of cleavage of hydrogen bonds in the PBT and formation of hydrogen bonds between the probe-molecules and the polymer. The surface Lewis acidity and basicity constants, K and K , respectively, were a b determined and found to correlate well with an analysis of the repeating unit and end-groups in this polymer.
Autores principais:	Santos, José M.R.C.A.
Outros Autores:	Guthrie, James T.; Fagelman, K.
Assunto:	Surface characteristics Inverse gas chromatography Acid–base interactions Thermodynamic parameters Polymers; Poly(butylene terephthalate)
Ano:	2002
País:	Portugal
Tipo de documento:	artigo
Tipo de acesso:	acesso restrito
Instituição associada:	Instituto Politécnico de Bragança
Idioma:	inglês
Origem:	Biblioteca Digital do IPB

Descrição
Resumo:	The surface of poly(butylene terephthalate) (PBT) was analysed by means of inverse gas chromatography (IGC). The specific component of the adsorption of polar probes on the surface of poly(butylene terephthalate) was found to be endothermic, and the change in the entropy of the system, positive, which is not a common case in IGC. An interpretation is given, based on the contribution of cleavage of hydrogen bonds in the PBT and formation of hydrogen bonds between the probe-molecules and the polymer. The surface Lewis acidity and basicity constants, K and K , respectively, were a b determined and found to correlate well with an analysis of the repeating unit and end-groups in this polymer.