Low-melting peak

Post-crystallization/heating Low-melting-peak shift Final drying De-dusting Setting-reactor PET Temperature... 

Figure 3.16 and Table 3.6 show the relationships between transition temperature, Td, and time, log L, for both high and low melting peaks. Td(h) does not change significantly with time, log tc. A similar phenomenon is observed for the relationship between AHd(h, Tc, tc) and log tc. This clearly reveals that... 

For fibers, the low-melting shoulder at 160-163°C appears which confirms either the presence of smaller crystallites or their imperfection. For the S-12 based formulation, the low-melting peak disappears which is the evidence of more uniform distribution of the additive within the material. The broadened crystallization peak is observed for the S-12 based samples. The increased friction and decreased chain mobility lead to the obstructed crystallization and the decreased crystallization rate. The narrowed crystallization peak is observed for the S-30 based samples. Crystallization proceeds only where no contact with this additive is. Hence, the S-12 and S-30 have different eneigies of intermolecular interaction of PHB chains and the additive surface. 

Both pure PEN and the PEN/CNT nanocomposites exhibited multiple melting peaks in the DSC heating thermograms. The small and low melting peaks observed at approximately 10-15 °C above the isothermal crystallization temperature was attributed to the melting of... 

For fibers, the low-melting shoulder at 160-163"C appears which confirms either the presence of smaller crystallites or their imperfection. For the S-12 based formulation, the low-melting peak disappears which is the evidence of more uniform distribution of the additive within the material. 

The coexistence of two types of structures in transparent polyethylene filaments obtained by Porter and co-workers47 by forcing the melt through a capillary was proved by the existence of two peaks in the thermogram a high-temperature peak for ECC and a low-temperature peak for FCC (cf. Fig. 8 c). 

Why do the enthalpy diagrams for the melting of indium and low density polyethylene differ from one another What does the breadth of the melting peak tell us about the polymer under study ... 

The DSC thermograms of several triblock copolymers and homopolymer HB are coiq>ared to that of a low density polyethylene in Figure 2. The thermograms are those of the first run on quenched samples. Their behavior is similar except that the temperature of the maximum in the DSC melting peak, Tm, for LDPE (110 C) is higher than that of HB (102°C). The depression of the melting point brought about by the presence of 5 to 8 mole percent... 

Usually, the materials are crystalline or semicrystalline after the purification procedure, thus a melting peak occurs in the first heating curve. Upon cooling, the material is vitrified, which is indicated by a step in Cp. In the second heating curve, after the endothermal step at Tg, it can be seen whether the material has a low or high tendency toward crystallization. In the latter case, exothermal recrystallization and subsequent melting can be detected (Fig. 3.2a). If the glass is kinetically stable, no recrystallization occurs, and only the step at Tg is visible (Fig. 3.2b). 

In figure 10 a 74 ug sample of flat polyester fiber obtained from a silk-like fabric was run in the DSC. In the first run appeared an endotherm apparently belonging to some sort of low molecular weight additive, then the characteristic double peak melt, this time with a much smaller low temperature peak. 

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