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

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

Characterisation of the surface lewis acid/base properties of the components of pigmented, impact-modified, pc/pbt blends by inverse gas chromatography – phase separation and phase preferences

Inverse gas chromatography was used to study the surface Lewis acid–base properties of the major components of pigmented, impact-modified, polycarbonate–poly(butylene terephthalate) blends. An investigation of the Lewis acid–base interactions in these polymeric systems has been carried out, based on the values determined for the surface Lewis acidity constant (K ), surface Lewis basicity constant (K ) and on the chemical and physical structure of the materials involved. This a b analysis provided the rationale for an interpretation of the phase separation and the phase preference that exist in these polymer blends, and of the consequences to their physical and mechanical properties