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              Macromolecules, Structure                                                                   897





























                     FIGURE 40 Solid-state  13 C spectra of five polyethylene samples: (a) low-density polyethylene, (b)–(d) high-density
                     linear polyethylene, and (e) ultraoriented polyethylene. [From Earl, W. L., and VanderHart, D. L. (1979). Macro-
                     molecules 12, 762.]










































                     FIGURE 41 Solid-state  13 C NMR spectra of (a) isotactic and (b) syndiotactic polypropylene shown with the corre-
                     sponding representations of their conformations. [From Bovey, F. A. (1982) “Chain Structure and Conformation of
                     Macromolecules,” Academic Press, New York.]
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