Cold crystallization studies on PET/PEN blends as revealed by microhardness |
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Authors: | M. T CONNOR M. C. GARCIA GUTIERREZ D. R RUEDA F. J. BALTA CALLEJA |
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Affiliation: | (1) Instituto de Estructura de la Materia, C.S.I.C., Serrano 119, E-28006 Madrid, Spain |
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Abstract: | The cold crystallization of amorphous films of poly(ethylene terephthalate) (PET) and poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) blends, with different composition, prepared by co-precipitation from solution followed by melt-pressing for 2 min at 280°C and quenching in ice-water, was followed by measuring the microhardness, H, in real time as a function of crystallization temperature and time. An analytical model was derived, relating properties of the individual components to the blend microhardness based on an Avrami-type equation to account for the crystallization of the components upon heating. Fitting of the model to the experimental results revealed a two-step hardening process of the blends. The degree of transesterification of the blends, can be estimated with this model. Finally, a removal of the physical ageing, inducing a decrease in H of PET in the blend, was observed upon heating above its glass transition temperature. This revised version was published online in November 2006 with corrections to the Cover Date. |
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