By analysing the specific heats and the mechanical characteristics of poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) amorphous single-state blends in the glass transition region, it has been found that increasing PVDF content cause a small reduction of the fragility of these systems. The degree of fragility has been evaluated from DCp/Cp,l, the normalized change of the heat capacity at Tg, and by modelling the mechanical aa-relaxation. The observed behaviour has been ascribed to a more coherent structure of the blends due to strong specific interactions between PMMA and PVDF polymeric chains.
Fragility in amorphous blends of linear polymers
Bartolotta A;Di Marco G;
2003
Abstract
By analysing the specific heats and the mechanical characteristics of poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) amorphous single-state blends in the glass transition region, it has been found that increasing PVDF content cause a small reduction of the fragility of these systems. The degree of fragility has been evaluated from DCp/Cp,l, the normalized change of the heat capacity at Tg, and by modelling the mechanical aa-relaxation. The observed behaviour has been ascribed to a more coherent structure of the blends due to strong specific interactions between PMMA and PVDF polymeric chains.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
