The Role of Polyethylene Wax on the Thermal Conductivity of Transparent Ultradrawn Polyethylene Films

Macromolecules
Xinglong PanCees W M Bastiaansen

Abstract

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.

References

Dec 31, 2008·Physical Review Letters·Asegun Henry, Gang Chen
Mar 9, 2010·Nature Nanotechnology·Sheng ShenGang Chen
Mar 25, 2018·Advanced Materials·Xiangfan XuBaowen Li
Apr 20, 2018·Science Advances·Yanfei XuGang Chen
Apr 27, 2018·Nature Communications·Ramesh ShresthaSheng Shen
Apr 18, 2019·Nature Communications·Yanfei XuGang Chen
Aug 24, 2019·Advanced Materials·Xinglong PanCees W M Bastiaansen

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Citations

May 4, 2021·Macromolecular Rapid Communications·Xinglong PanAlbert P H J Schenning
Jun 9, 2021·ACS Applied Materials & Interfaces·Xinglong PanCees W M Bastiaansen
Nov 12, 2021·Chemical Society Reviews·Minxiang ZengYanliang Zhang

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Methods Mentioned

BETA
light scattering
optical microscopy
X-ray

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