Journal
POLYMER JOURNAL
Volume 53, Issue 12, Pages 1371-1381Publisher
SPRINGERNATURE
DOI: 10.1038/s41428-021-00516-9
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Funding
- National Natural Science Foundation of China [51573118, U1630139, 51721091]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-15R48]
- State Key Laboratory of Polymer Materials Engineering
- Fundamental Research Funds for the Central Universities
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The paper achieves a mesh-like crystal structure of ultrahigh molecular weight polyethylene (UHMWPE) films through a two-step biaxial stretching mode, which increases the in-plane thermal conductivity.
The thermal conductivity of bulk polymeric films can be generally improved by introducing interlaced lamellar or shishkebab crystals along the machine direction (MD) through uniaxial stretching or high-pressure extrusion. However, the thermal pathway along the transverse direction (TD) is disrupted to limit the enhancement of in-plane thermal conductivity as the draw ratio increases. In this paper, a mesh-like crystal structure of ultrahigh molecular weight polyethylene (UHMWPE) films is achieved through a two-step biaxial stretching mode to construct a planar-oriented crystal network. The in-plane thermal conductivity increases to 7.3Wm/K at a total draw ratio of 25. This mesh-like crystal network structure was investigated through scanning electron microscopy (SEM) and 1-dimensional wide-angle X-ray diffraction (1D-WXRD). The evolution mechanism of the crystal network structure is proposed on the basis of single-temperature biaxial stretching modes with different draw ratios. The construction of additional order along the TD to form a planar-oriented crystal network structure by biaxial stretching can provide new insight into improving the in-plane thermal conductivity of bulk polymeric films.
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