The melting temperature of a polymer reflects the melting of crystals formed during primary and secondary crystallization, This frequently gives rise to multiple endotherms
in a DSC heating scan, where the upper peak corresponds to melting of primary crystals and the lower peak corresponds to melting of crystals formed during secondary crystallization (e.
For example, a 30% glass-filled phydroxybenzoic acid (HBA)/6-hydroxynaphthoic 2-acid (HNA) copolyester LCP has a DSC endotherm
The thermograms in figure 3 illustrate the changes typically observed in the shape of the melting endotherm
peaks due to a combination of crystallization and annealing effects.
The DSC heating curves/melting endotherms
were obtained for different ageing conditions and only representative curves for 50[degrees]C + W are given in Fig.
Bakker claimed that all dinosaurs were "automatic" endotherms
- animals with fast, stable metabolisms that supply enough internal heat to keep their body temperatures constant.
A single melting endotherm
was observed after the annealing process at an optimized temperature and processing time [41, 42].
By increasing the irradiation dose, the degree of branching increases and the branch length decreases [17, 22], There are available a number of reports on the appearance of shoulder or duplicated crystallization/melting curves of LCB PP , It is reported that the presence of a shoulder in cooling thermogram is due to the crystal defects which consequently leads to a flattened melting endotherm
c]) is calculated by dividing the melt enthalpy of samples (the area under the endotherm
peak in DSC curve obtained while investigating melting behavior) by the melt enthalpy of the samples with 100% crystallinity ([DELTA][H.
2 K showed a significant difference in the relative area of the lower melting endotherm
to the higher melting endotherm
cc]) associated to the formation of early incomplete crystals, and the multimelting process characterized by two endotherms
(142 and 154 [degrees]C) corresponding to PLA phase and a single melt endotherm
to lower temperature (130 [degrees]C) for PE phase in ternary blends (19).
was observed for pure PLA and the composites after [T.
In this work, we have observed multiple melting endotherm
phenomena in identical PUs prepared from only hard segments in the main backbone.