The Role of Polyethylene Wax on the Thermal Conductivity
of Transparent Ultradrawn Polyethylene Films
Posted on 2020-06-15 - 17:03
Transparency and
thermal conductivity of ultradrawn, ultrahigh-molecular-weight
polyethylene films containing different contents of low-molecular-weight
polyethylene wax (PEwax) are explored from experimental
and theoretical viewpoints. It is shown that the addition of PEwax decreases light scattering in all directions, resulting
from a reduction of defects while having little effect on crystallinity
or chain orientation of ultradrawn films. In general, upon the addition
of PEwax, the thermal conductivity of ultradrawn films
increases with the highest conductivity being 47 (W m–1 K–1) and subsequently decreases at higher concentrations.
The thermal conductivity also depends on draw ratio and number-average
molecular weight (Mn) of the films. A model is presented which correlates
the thermal conductivity of the films with the draw ratio and Mn,
enabling explanation of the experimental results. Hence, the thermal
conductivity of ultradrawn polyethylene films can be predicted as
a function of Mn and draw ratio.
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Pan, Xinglong; Schenning, Albert H. P. J.; Shen, Lihua; Bastiaansen, Cees W. M. (2020). The Role of Polyethylene Wax on the Thermal Conductivity
of Transparent Ultradrawn Polyethylene Films. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.9b02647