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 causes a small reduction of the fragility of these systems. The degree of fragility has been evaluated from ΔCp / Cp,l, the normalized change of the heat capacity at Tg, and by modelling the mechanical αa-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.
Titolo: | Fragility in amorphous blends of linear polymers |
Autori: | |
Data di pubblicazione: | 2003 |
Rivista: | |
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 causes a small reduction of the fragility of these systems. The degree of fragility has been evaluated from ΔCp / Cp,l, the normalized change of the heat capacity at Tg, and by modelling the mechanical αa-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. |
Handle: | http://hdl.handle.net/11570/1584804 |
Appare nelle tipologie: | 14.a.1 Articolo su rivista |