Abstract
Poly(p-xylylene) (PPX) was prepared by vapor phase pyrolysis of [2.2]paracyclophane following the procedure of Gorham. PPX was obtained in different crystalline modifications by dry annealing, dissolution and reprecipitation under different conditions. These samples were analyzed by WAXS and 13 C CP-MAS NMR spectroscopy. Clear evidence was found that the presence of different crystalline modifications is responsible for the unexpected 13 C CP-MAS NMR spectrum as observed for as-polymerized PPX. An attempt was made to explain the differences observed in the 13 C CP-MAS NMR spectra of different crystalline modifications by different chemical environments utilizing simulations of the crystal unit cells.
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