The thermograms of the blends exhibit either a single glass transition event, characterized by a quite broad temperature range, or two glass transitions.
The temperatures of the glass transitions are shown in Table 2.
Loss modulus and tan δ versus temperature curves indicated homogeneous systems with single glass transitions.
According to the dynamic mechanical analysis (DMA) experimental data, multiple amorphous phases with different glass transition temperatures were observed for each tested semicrystalline sample.
The complex dispersion state of the layered silicates was well reflected in the glass transition relaxation, which showed multiple peaks.
Multiple studies reported interface roughening between two polymer layers by thermal annealing at glass transition temperature of the bulk material (Tg,Bulk) in the range of several nanometers.
Analagous to time temperature superposition, the apparent activation energy of glass transition, ΔEa, is determined through the use of results obtained at multiple frequencies applying the Arrhenius principle.
The glass transition at 4°C, detected by means of dynamic mechanical analysis, and multiple melt behaviour, detected by means of differential scanning calorimetry (DSC), does not depend upon the presence of glass bead fillers.
The dynamic t Tdyn Tg diagram was proposed to analyze those multiple peaks to identify the material status and the transition temperatures corresponding to the initial glass transition (Tg0), vitrification (Tvit), and final glass transition (Tg∞) temperatures.
%) promotes the manifestation of 'constrained dynamics' effect in the whole matrix; this results in a shift of main glass transition peak to higher temperatures as a whole including its onset, with the multiple increasing relaxation also in the region of 270°C to 320°C (Figure 7).
