Fig. 1 | Nature Communications

Fig. 1

From: Nanostructured polymer films with metal-like thermal conductivity

Fig. 1

Fabrication and characterization of polymer films with high thermal conductivity. ac Photos of commercial ultrahigh molecular weight polyethylene (UHMWPE) powders, a thick opaque as-extruded film and a thin transparent drawn film, respectively. d Illustration of film morphology evolution during fabrication. The powders feature lamellar polyethylene crystallites embedded in a disordered and entangled chain network. The degree of entanglement greatly reduces in the hot decalin solution and after subsequent Couette-flow extrusion. The ultradrawn films are characterized by oriented crystallites interconnected by aligned amorphous chains. e Scanning electron microscope (SEM) images of some UHMWPE powders. Scale bar indicates 20 μm. f SEM image of an as-extruded film. Scale bar indicates 10 μm. g SEM image of a 10× draw ratio film. Scale bar indicates 2 μm. h SEM image of a ×110 film. Scale bar indicates 2 μm. i, j SEM images of a torn ×70 film revealing the polyethylene nanofibers as the basic building blocks. Scale bar indicates 500 nm and 200 nm, respectively

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