Thermal and Rheological Properties of Fischer–Tropsch Wax/High-Flow LLDPE Blends
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Thermal and Rheological Properties of Fischer–Tropsch Wax/High-Flow LLDPE BlendsAutor(es)
Data
2024-08Cita bibliográfica
T. Mhlabeni, S. Ramjee, J. López, A.-M. Díaz-Díaz, R. Artiaga, W. Focke, Thermal and Rheological Properties of Fischer–Tropsch Wax/High-Flow LLDPE Blends. Macromol. Mater. Eng. 2024, 309, 2300125. https://doi.org/10.1002/mame.202300125
Resumo
[Abstract]: Waxes find use as processing aids in filled compounds and
polyethylene-based masterbatches. In such applications, the thermal and
physical property changes they impart to the polymer matrix are important.
Therefore, this study details results obtained for blends prepared by mixing a
Fischer–Tropsch (F–T) wax with a high-flow linear low-density polyethylene
(LLDPE). The melting and crystallization behavior are studied using hot-stage
polarized optical microscopy (POM) and differential scanning calorimetry
(DSC). The calorimetry results are consistent with partial cocrystallization of
the two components. The melting and crystallization exo- and endotherms for
the wax- and LLDPE-rich phases remained separate. However, they change in
shape and shift toward higher- and lower temperature ranges, respectively. It
is found that increasing the wax content delays the crystallization, decreases
the overall crystallinity, and reduces the size of the crystallites of the
polyethylene-rich phase. Rotational viscosity is measured at 170 °C in the
Newtonian shear-rate range. The variation of the zero-shear viscosity with
blend composition is consistent with the assumption of a homogeneous melt
in which the chains are in an entangled state. Therefore, it is concluded that
the wax and LLDPE are, in effect, miscible in the melt and partially compatible
in the solid state.
Palabras chave
Cocrystallization
LLDPE
Viscosity
Waxes
LLDPE
Viscosity
Waxes
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Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
ISSN
1439-2054
1438-7492
1438-7492