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Section 3.5  Polymers                                                        87
































            Figure 3.12 Molecular structure of several linear polymers. All but the last two are related
            to the polyethylene structure by simple substitutions, R, R 1 and R 2 ,or F.

























            Figure 3.13 Crystal structure of polyethylene. Layers similar to that shown in the diagram
            are seen edge-on in the photo, being arranged in a radiating pattern to form the
            prominent crystalline features called spherulites. (Photo courtesy of A. S. Holik,
            General Electric Co., Schenectady, NY. Diagram reprinted with permission from [Geil 65];
            c   1965 by the American Chemical Society.)
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